Academic literature on the topic 'Laser diagnostic data'
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Journal articles on the topic "Laser diagnostic data"
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KOUCKY, Miroslav, and David VALIŠ. "SUITABLE APPROACH FOR NON-TRADITIONAL DETERMINATION OF SYSTEM HEALTH AND PROGNOSTICS." Scientific Journal of the Military University of Land Forces 159, no. 1 (January 3, 2011): 123–34. http://dx.doi.org/10.5604/01.3001.0002.2884.
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Nowadays the system requirements are set up and evaluated in various manners. We have plenty of excellent options available taking into account item technical state or/and other states and talking about diagnostic options. Tribodiagnostics is one of the independent and good parts to assess the system condition. The paper deals with the mathematical processing, monitoring and analysis of the oil field data got as a result from the laser spectrography in frame of the tribodiagnostic oil tests. This diagnostic approach has been currently used for oil diagnostic results comparison – usually for comparison of expected system state determined by laser spectrography only. There is not known deeper relation of oil diagnostics data and system related consequences (like determining the terminal state and service optimization – maintenance for instance).
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Irimiciuc, Stefan Andrei, Sergii Chertopalov, Jan Lancok, and Valentin Craciun. "Langmuir Probe Technique for Plasma Characterization during Pulsed Laser Deposition Process." Coatings 11, no. 7 (June 25, 2021): 762. http://dx.doi.org/10.3390/coatings11070762.
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The history of pulsed laser deposition (PLD) and transient plasmas generated by laser ablation is intertwined with the development of various techniques for its fundamental understanding. Some diagnostic tools have been developed to better suit the rapid transient nature of the plasma (space and time dependence of all parameters, fast decay and complex chemistry inside the plasma), whereas others have been adapted from basic plasma physics studies. Langmuir probe method has been used as a real-time in situ diagnostic tool for laser ablation and later for PLD. It remains a useful tool for the PLD community arsenal, which can easily be adapted to the development of new lasers and ablation regimes and new deposition configuration, being one of the most versatile techniques for plasma diagnostics. It is the cornerstone on which charge particles are analyzed and has led to several important discoveries, such as multiple peak distribution, selective acceleration during expansion, plume splitting, plasma turbulences and fluctuations. However, because the Langmuir probe theory adaptation from classical plasma physics is not straightforward, it might lead to misinterpretation and often incorrect analysis of data. This review analyzes the limits and understanding of the technique as a foundation for attaining its full potential, which can impact the way PLD is used. This is especially useful for the pressing need of real-time, in-situ diagnostics and feedback loops for systematic semi-industrial implementation of the PLD technique.
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Fiorani, Luca, Florinda Artuso, Isabella Giardina, Antonia Lai, Simone Mannori, and Adriana Puiu. "Photoacoustic Laser System for Food Fraud Detection." Sensors 21, no. 12 (June 18, 2021): 4178. http://dx.doi.org/10.3390/s21124178.
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Economically motivated adulterations of food, in general, and spices, in particular, are an emerging threat to world health. Reliable techniques for the rapid screening of counterfeited ingredients in the supply chain need further development. Building on the experience gained with CO2 lasers, the Diagnostic and Metrology Laboratory of ENEA realized a compact and user-friendly photoacoustic laser system for food fraud detection, based on a quantum cascade laser. The sensor has been challenged with saffron adulteration. Multivariate data analysis tools indicated that the photoacoustic laser system was able to detect adulterants at mass ratios of 2% in less than two minutes.
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Castellini, P., and G. M. Revel. "Laser vibration measurements and data processing for structural diagnostic on composite material." Review of Scientific Instruments 71, no. 1 (January 2000): 207–15. http://dx.doi.org/10.1063/1.1150184.
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Stancalie, V. "Theoretical calculation of atomic data for plasma spectroscopy." Laser and Particle Beams 27, no. 2 (April 22, 2009): 345–54. http://dx.doi.org/10.1017/s0263034609000457.
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AbstractIn the present article, a number of theoretical approximations and numerical methods, varying in complexity, are reviewed, in order to facilitate their selection for plasma diagnostic purposes. Results refer to highly charged ions, particularly in the lithium isoelectronic sequence. This article describes progress in understanding the role of laser induced degenerate state phenomenon on resonances obtained by using lasers. This type of process, implicitly included in the R-matrix Floquet calculation, contributes to some degree, to the overall behavior of the resonance profiles. The present article gives comparative results obtained from ab initio non-perturbative treatment and perturbative calculation of autoionization widths in Be-like ions. The effective oscillator strength for complex highly ionized atoms is, also, provided. Such calculations are of interest as they represent accurate benchmark data for beam emission spectroscopy, Zeff analysis, or complex atoms modeling in fusion plasma devices.
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Wang, Zhenhai, Pengfei Fu, and Xing Chao. "Laser Absorption Sensing Systems: Challenges, Modeling, and Design Optimization." Applied Sciences 9, no. 13 (July 5, 2019): 2723. http://dx.doi.org/10.3390/app9132723.
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Laser absorption spectroscopy (LAS) is a promising diagnostic method capable of providing high-bandwidth, species-specific sensing, and highly quantitative measurements. This review aims at providing general guidelines from the perspective of LAS sensor system design for realizing quantitative species diagnostics in combustion-related environments. A brief overview of representative detection limits and bandwidths achieved in different measurement scenarios is first provided to understand measurement needs and identify design targets. Different measurement schemes including direct absorption spectroscopy (DAS), wavelength modulation spectroscopy (WMS), and their variations are discussed and compared in terms of advantages and limitations. Based on the analysis of the major sources of noise including electronic, optical, and environmental noises, strategies of noise reduction and design optimization are categorized and compared. This addresses various means of laser control parameter optimization and data processing algorithms such as baseline extraction, in situ laser characterization, and wavelet analysis. There is still a large gap between the current sensor capabilities and the demands of combustion and engine diagnostic research. This calls for a profound understanding of the underlying fundamentals of a LAS sensing system in terms of optics, spectroscopy, and signal processing.
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Коровкина and A. Korovkina. "Statistical modeling of significant diagnostic methods used in the treatment ofprimary forms of inflammatory periodontal diseases." Journal of New Medical Technologies. eJournal 8, no. 1 (November 5, 2014): 0. http://dx.doi.org/10.12737/6674.
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In the article the ground of choice of meaningful methods of diagnostics is carried out on the basis of statistical analysis of data got during realization of photo-radiotherapy of initial forms of inflammatory diseases of paradontium. For this purpose inspection was conducted in 100 patients with gingivitis of easy and middle degree, periodontitis of easy degree by means of an offer algorithm of diagnostics – clinical and laboratory me-thods. The clinical methods were indexes, stomatoscopy and the laboratory method was the laser Doppler flow-metry. All patients were divided into 2 groups: basic (50 patients), which was applied photo-radiotherapy using a device Uzor-А-2К by power 18 W; and control (50 patients) to them medical treatment was recommended. Sta-tistical analysis of data, obtained in the study, was performed using SAS 9.3. and Microsoft Office 2010 - analysis of contingency tables and logistic regression.Significant diagnostic methods when conducting contin-gency tables were stomatoscope and the CPITN index. Laser Doppler flowmetry and significant parameters of microcirculation were determined using the method of logical regression. This is testified to optimally proposed algorithm for diagnosis of early forms of inflammatory periodontal diseases.
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Lopes, Bernardo, Marcella Q. Salomão, Isaac C. Ramos, and Fernando Faria-Correia. "Unilateral Ectasia characterized by Advanced Diagnostic Tests." International Journal of Keratoconus and Ectatic Corneal Diseases 5, no. 1 (2016): 40–51. http://dx.doi.org/10.5005/jp-journals-10025-1120.
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ABSTRACT To describe a case of very asymmetric ectasia successfully treated by femtosecond laser-assisted intracorneal ring segment implantation, in which the diagnosis of unilateral ectasia in the right eye was based on the clinical findings including history, follow-up, and advanced diagnostic data. The patient's history was positive for ocular allergy with moderate- to-intense eye rubbing only in the right eye. The uncorrected distance visual acuity was 20/63 in the right eye and 20/32 in the left eye. The corrected distance visual acuity (CDVA) was 20/40 in the right eye (-1.75-4.00 × 35°) and 20/16 in the left eye (-0.50-0.25 × 115°). After femtosecond laser-assisted intracorneal ring segment implantation, the right eye improved CDVA to 20/20-1. Concerning ectasia/keratoconus diagnosis, the left eye remained stable over 1 year of follow-up with unremarkable topometric, tomographic, and biomechanical findings. Epithelial thickness mapping by spectral domain optical coherence tomography and very-high-frequency digital ultrasound demonstrated epithelial thickness within normal limits in the left eye. Advanced diagnostic methods along with clinical data enable the distinction from unilateral ectasia cases and subclinical (fruste) keratoconus. Literature review is also performed along with case presentation and discussion. How to cite this article Ramos IC, Reinstein DZ, Archer TJ, Gobbe M, Salomão MQ, Lopes B, Luz A, Faria-Correia F, Gatinel D, Belin MW, Ambrósio R Jr. Unilateral Ectasia characterized by Advanced Diagnostic Tests. Int J Kerat Ect Cor Dis 2016;5(1):40-51.
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K, Harini, and Radhika Arjunkumar. "Awareness of Laser Dentistry Among Dentists in Tanjore- A survey." Biomedical and Pharmacology Journal 11, no. 3 (July 10, 2018): 1623–32. http://dx.doi.org/10.13005/bpj/1530.
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Diode laser are used for soft tissue surgeries in the oral cavity.The use of laser is limited due to the lack of knowledge, effectiveness and the high cost of laser unit. The use of lasers can decrease morbidity after surgery and reduces the need for anaesthetics.the laser is used for caries prevention, bleaching, restorative removal and curing, cavity preparation, dentinal hypersensitivity, growth modulation and for diagnostic purposes, whereas soft tissue application includes incision, excision, ablation, wound healing, removal of hyperplastic tissue to uncovering of impacted or partially erupted tooth, photodynamic therapy for malignancies, photo stimulation of herpetic lesion. Although dental lasers was introduced in 1964, its knowledge and implementation has increased only in past 15-20 years especially in developing countries like India. In order to evaluate the knowledge on laser and its implementationin the field of dentistry among dentists in Tanjore, this survey was conducted among dentists in Tanjore. This cross-sectional, descriptive study was carried out among dentists in Tanjore. A questionnaire consisting of 3 main parts was designed and administered to dentists in Tanjore and knowledge was assessed. The data were entered and analysed statistically. 14% of dentists have adequate knowledge,46% of dentists have moderate knowledge, 39% of dentists have inadequate knowledge.35% of dentists had practiced laser dentistry before.The wellknown information among dentists about the dental laser is the lasers application in gingivectomy and crown lengthening. 50% of dentists felt that cost of laser unit is the biggest deterrant in practicing laser dentistry. Most of the dentists have only moderate knowledge on laser.Education should be given on laser to increase its implementation in field of dentistry.
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Paull, Peter E., Benjamin J. Hyatt, Wahid Wassef, and Andrew H. Fischer. "Confocal Laser Endomicroscopy: A Primer for Pathologists." Archives of Pathology & Laboratory Medicine 135, no. 10 (October 1, 2011): 1343–48. http://dx.doi.org/10.5858/arpa.2010-0264-ra.
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Context.—The advent of new endoscopic optical techniques is likely to change pathologists' role in diagnosis. Objective.—To describe how confocal laser endomicroscopy (CLE) works, show its advantages and limitations compared to cytohistologic biopsy, and explore how it may affect the practice of pathology. Data Sources.—Literature review. Conclusions.—Confocal laser endomicroscopy is proving its ability to provide histology-like images of tissues in vivo to help avoid risks and costs of conventional biopsies. Confocal imaging restricts light to 1 plane, emulating a paraffin section, and topical or systemic optical contrast agents allow subcellular resolution. New contrast agents could theoretically permit molecular characterization. In vivo imaging has begun to demonstrate novel, dynamic types of diagnostic features. Decreased histologic biopsies can be anticipated for a few scenarios. Significant limitations of CLE include the inability to create a tissue archive for broad molecular classification, suboptimal contrast agents, small fields of view and shallow penetration, paucity of clinical validation studies, and problems with reimbursement. Confocal laser endomicroscopy exposes new opportunities for pathologists: CLE technologies can be exploited in pathology, and diagnostic criteria expanded based on endoscopists' discoveries. Potential synergy exists between CLE and cytology, allowing the low-magnification diagnostic architectural changes by CLE and cytomorphology to emulate the full diagnostic information in a histologic biopsy while providing an archive of material for molecular or immunohistochemical studies. Confocal laser endomicroscopy will decrease some types of biopsies, but offers an opportunity for pathologists to find new ways to provide value and improve patient care.
Dissertations / Theses on the topic "Laser diagnostic data"
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Price, Ralph J. "Modeling Three Reacting Flow Systems with Modern Computational Fluid Dynamics." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1810.pdf.
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Megahed, Fadel M. "The Use of Image and Point Cloud Data in Statistical Process Control." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/26511.
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The volume of data acquired in production systems continues to expand. Emerging imaging technologies, such as machine vision systems (MVSs) and 3D surface scanners, diversify the types of data being collected, further pushing data collection beyond discrete dimensional data. These large and diverse datasets increase the challenge of extracting useful information. Unfortunately, industry still relies heavily on traditional quality methods that are limited to fault detection, which fails to consider important diagnostic information needed for process recovery. Modern measurement technologies should spur the transformation of statistical process control (SPC) to provide practitioners with additional diagnostic information. This dissertation focuses on how MVSs and 3D laser scanners can be further utilized to meet that goal. More specifically, this work: 1) reviews image-based control charts while highlighting their advantages and disadvantages; 2) integrates spatiotemporal methods with digital image processing to detect process faults and estimate their location, size, and time of occurrence; and 3) shows how point cloud data (3D laser scans) can be used to detect and locate unknown faults in complex geometries. Overall, the research goal is to create new quality control tools that utilize high density data available in manufacturing environments to generate knowledge that supports decision-making beyond just indicating the existence of a process issue. This allows industrial practitioners to have a rapid process recovery once a process issue has been detected, and consequently reduce the associated downtime.Ph. D.
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Håkansson, Ellinor. "A Deep Learning Approach to Predicting Diagnosis Code from Electronic Health Records." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240599.
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Electronic Health Record (EHR) is an umbrella term encompassing demographics and health information of a patient from many different sources in a digital format. Deep learning has been used on EHRs in many successful studies and there is great potential in future implementations. In this study, diagnosis classification of EHRs with Multi-layer Perceptron models are studied. Two MLPs with different architectures are constructed and run on both a modified version of the EHR dataset and the raw data. A Random Forest is used as baseline for comparison. The MLPs are not successful in beating the baseline, with the best-performing MLP having a classification accuracy of 48.1%, which is 13.7 percentage points lower than that of the baseline. The results indicate that when the dataset is small, this approach should not be chosen. However, the dataset is growing over time and thus there is potential for continued research in the future.Elektronisk patientjournal (EHR) är ett paraplybegrepp som används för att beskriva en digital samling av demografisk och medicinsk data från olika källor för en patient. Det finns stor potential i användandet av djupinlärning på dessa journaler och många framgångsrika studier har redan gjorts på området. I denna studie undersöks diagnosklassificering av elektroniska patientjournaler med Multi-layer perceptronmodeller. Två MLP-modeller av olika arkitekturer presenteras. Dessa körs på både en anpassad version av EHR-datamängden och på den råa EHR-datan. En Random Forest-modell används som baslinje för jämförelse. MLP-modellerna lyckas inte överträffa baslinjen, då den bästa MLP-modellen ger en klassifikationsnoggrannhet på 48,1%, vilket är 13,7 procentenheter mindre än baslinjens. Resultaten visar att en liten datamängd indikerar att djupinlärning bör väljas bort för denna typ av problem. Datamängden växer dock över tid, vilket gör områdetattraktivt för framtida studier.
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Peter, Roman. "Obrazový databázový systém pro podporu diagnostiky glaukomu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217228.
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Tato práce popisuje přehled standardních a pokročilých metod používaných k diagnose glaukomu v ranném stádiu. Na základě teoretických poznatků je implementován internetově orientovaný informační systém pro oční lékaře, který má tři hlavní cíle. Prvním cílem je možnost sdílení osobních dat konkrétního pacienta bez nutnosti posílat tato data internetem. Druhým cílem je vytvořit účet pacienta založený na kompletním očním vyšetření. Posledním cílem je aplikovat algoritmus pro registraci intenzitního a barevného fundus obrazu a na jeho základě vytvořit internetově orientovanou tři-dimenzionální vizualizaci optického disku. Tato práce je součásti DAAD spolupráce mezi Ústavem Biomedicínského Inženýrství, Vysokého Učení Technického v Brně, Oční klinikou v Erlangenu a Ústavem Informačních Technologií, Friedrich-Alexander University, Erlangen-Nurnberg.
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Biasiori-Poulanges, Luc. "Fragmentation aérodynamique d’une goutte liquide induite par une onde de choc plane High-magnification shadowgraphy for the study of dropbreakup in a high-speed gas flow On the formation and recurrent shedding of ligaments in droplet aerobreakup Data on eosin y solutions for laser-induced fluorescence in water flows Multimodal imaging for intra-droplet gas-cavity observation during droplet fragmentation." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2021. http://www.theses.fr/2021ESMA0002.
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Ce travail de thèse propose une description originale de la fragmentation aérodynamique d’une goutte d’eau, induite par une onde de choc plane, pour des régimes à la frontière entre les modes gouvernés par l’instabilité de Rayleigh-Taylor et ceux dominés par l’instabilité de Kelvin-Helmholtz. Un banc expérimental composé d’un tube à choc couplé à des diagnostics d’imagerie rapide est exploité pour caractériser les processus de fragmentation. Les résultats expérimentaux sont complétés par des simulations numériques réalisées à partir du code multiphasique compressible open-source ECOGEN. L’effet de l’onde de choc sur la goutte est évalué grâce à une modélisation théorique basée sur l’acoustique géométrique permettant de décrire la dynamique spatio-temporelle des réflexions d’onde à l’intérieur de la goutte et de prédire le lieu des points de plus haute densité d’énergie. Le champ de pression est résolu à partir de simulations numériques qui indiquent que la tension de rupture de l’eau est atteinte pour une onde de choc évoluant à un nombre de Mach de 1.7. Dès lors, un processus de cavitation dont les conséquences sur la dynamique de la fragmentation pourraient être significatives, est possible. Concernant la dynamique interfaciale, les expériences comme les simulations révèlent le développement d’une perturbation azimutale transverse à l’origine d’une structure ligamentaire périodique. Une analyse de Fourier des résultats numériques 3-D suggère que l’initiation de cette déstabilisation est indépendante des effets capillaires, à l’inverse de sa croissance. La dynamique ligamentaire apparaît être un processus cyclique dont la fréquence est celle du lâché de vortex dans le sillage del a goutte. Ce schéma récurrent cesse après quatre cycles. Il s’en suit alors la perte de l’intégrité structurelle du corps résiduel de la goutte des suites du développement d’une cavité gazeuse, dans le liquide, qui agit comme une région de fragilité et donc, facilite la fragmentationThis thesis proposed a groundbreaking description of the shock-induced aerodynamic fragmentation of a water droplet at the transition of the Rayleigh-Taylor Piercing and the Shear-Induced Entrainment regimes. An experimental facility consisting of a shock tube and high-speed imaging diagnostics is used to investigate the fragmentation processes. Experimental results are supported with numerical simulations performed with the open-source code ECOGEN dedicated to multiphase compressible flows. The shock wave effect on the droplet is assessed by a theoretical modelling based on geometrical acoustics which allows for the description of the wave spatio-temporal dynamics and enables to predict the time-dependent location of the highest energy density. Pressure fields are determined using numerical simulations. It appears that the water tensile rupture is reached for a shock wave Mach number of 1.7 from which bubble cloud cavitation may occur by causing signification changes in the fragmentation dynamics. As regards to the interfacial dynamics, both experiments and numerical simulations show the development of a transverse azimutal modulation resulting in the periodic ligament structure at the droplet surface. Contrary to the modulation growth, its initiation seems to be independent of the capillary effects as revealed by a Fourier analysis of the 3-D numerical results. The ligament dynamics is a cyclic process driven by the vortex shedding process in the wake of the droplet. Four cycles have been observed before the residual droplet core breaks up owing to the growth of an air cavity inside the droplet that acts as weak spot, and thus facilitating the droplet split-off
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Loisel, Guillaume. "Des plasmas stellaires aux plasmas de laboratoire : Application aux mesures d'opacité dans les domaines X et XUV." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00579800.
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Cette thèse s'inscrit dans le contexte général des propriétés radiatives de la matière à haute densité d'énergie (>1011 J/cm3). Les densités d'énergie de la MHDE font qu'une partie importante des échanges d'énergie passe par l'interaction rayonnement-matière. Mes études portent sur l'opacité spectrale, un paramètre fondamental pour la modélisation des intérieurs stellaires et qui constitue aussi une observable propice aux tests expérimentaux des descriptions théoriques de la physique des plasmas chauds et denses. Mes travaux de thèse sont centrés sur l'étude expérimentale des opacités de plasmas à l'équilibre thermodynamique local pour des températures de quelques dizaines d'eV (soit quelques 100 000 K) et quelques mg/cm3 en densité. Les plasmas sont obtenus dans des conditions aussi homogènes que possible en utilisant le chauffage radiatif d'une cavité irradiée par laser de haute énergie, 100-300 J. Ainsi, nous avons pu mettre à profit pour ce type de mesure la configuration utilisant des lasers nanoseconde et picoseconde du LULI (Laboratoire pour l'Utilisation des Lasers Intenses) pour réaliser le chauffage d'une part et la mesure sur un temps bref d'autre part de la transmission des plasmas, l'utilisation d'impulsions courtes constituant une première pour ce type d'expériences. Dans le domaine des X de l'ordre du keV, les transitions absorbantes 2p−3d ou 3d−4f d'éléments de numéro atomique moyen ou élevé ont été sondées. Elles font apparaitre des structures d'absorption dont la forme résulte principalement de la compétition entre l'éclatement spin-orbite et les effets d'élargissement statistiques. Il a été montré que cette compétition dépendait fortement du numéro atomique Z. Ainsi à paramètres plasma proches nous avons exploré l'opacité des éléments fer, nickel, cuivre et germanium (Z autour de 30) dans une première série de mesures puis celle du baryum, samarium et du gadolinium, dans une seconde expérience (Z autour de 60). L'astrophysique stellaire nécessite aussi de mesurer précisément, et de manière bien caractérisée, les opacités du groupe du fer (Cr, Fe, Ni et Cu) dans le domaine des XUV (50 − 200 eV). Ces opacités sont à l'origine de l'excitation dans les enveloppes radiatives des étoiles pulsantes massives de type spectral B pour une température de l'ordre de 200 000 K. Dans ces conditions, les moyennes de Rosseland présentent des différences nettes entre les calculs utilisés par la communauté astrophysique et ne permettent pas d'interpréter les oscillations et l'ensemble des fréquences observées de manière univoque. Pour permettre des comparaisons avec divers calculs spectraux, j'ai participé à la mise en place d'un nouveau schéma expérimental à deux cavités dont le but était d'améliorer l'homogénéité du chauffage des échantillons. Je montrerai enfin l'analyse des paramètres plasmas pour ce type de schéma. J'ai en particulier analysé le cas du nickel dont la transmission a été mesurée pour la première fois dans cette gamme spectrale. Dans chaque cas je présenterai l'analyse des résultats obtenus.
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Kistan, Trevor. "Neural network assisted software engineered refractive fringe diagnostic of spherical shocks." Thesis, 1996. http://hdl.handle.net/10413/4859.
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A shock is essentially a propagating variation in the pressure or density of a medium. If the medium is transparent, such as air, and the shock radially symmetric, the refractive fringe diagnostic can be
used to examine its general features. A laser beam probes the shock, the central part of the beam, refracted to different degrees by the different density features within the shock, interferes with itself and
with the outer unrefracted part creating a series of coarse and fine fringes. By examining this interference pattern one can gain insight into the density profile underlying the shock. A series of such experiments was conducted by the Plasma Physics Research Institute at the University of Natal in 1990. To model the situation computationally, they developed a ray-tracer which produced
interference patterns for modified theoretical density profiles based on those predicted by Sedov. After numerous trials, an intensity pattern was produced which agreed approximately with experimental
observations. Thus encouraged, the institute then sought to determine density profiles directly from the interference patterns, but a true mathematical deconvolution proved non-trivial and is still awaited. The work presented in this thesis reconstructs the ray-tracer using software engineering techniques and achieves the desired deconvolution by training a neural network of the back-propagation type to behave as an inverse ray-tracer. The ray-tracer is first used to generate numerous density profile - interference pattern pairs. The neural network is trained with this theoretical data to provide a density profile when presented with an interference pattern. The trained network is then tested with experimental interference patterns extracted from captured images. The density profiles predicted by the neural network are then fed back to the ray-tracer and the resultant theoretically determined interference patterns compared to those obtained experimentally. The shock is examined at various times after the initial explosion allowing its propagation to be tracked by its evolving density profile and interference pattern. The results obtained prove superior to those first published by the institute and confirm the neural network's promise as a research tool. Instead of lengthy trial and error sessions with the unaided ray-tracer, experimental interference patterns can be fed directly to an appropriately trained neural network to yield an initial density profile. The network, not the researcher, does the pattern association.Thesis (M.Sc.)-University of Natal, 1996.
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Wang, Chin-Jung, and 王錦榮. "Development fault diagnosis systems of power transformer based on data acquisition module from GSM and Multi-layer SVM classifier." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/03964714756579401296.
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碩士國立高雄應用科技大學
電機工程系碩士班
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This thesis is aimed to develop and implement a wireless preventing system for power transformers in substation. The functions of power transformer proposed data acquisition and monitoring system including data acquisition and fault alarm are applied to identify various types of possible or near fault by analyzing the collecting data. These data consisted of load current, real power, vibrating signal and gas-in-oil, can be collected and transmitted by Global System for Mobile communications ( GSM ) wireless data acquisition module. Then, a power transformer located at the fifth container center of Kaohsiung port is used for field testing to demonstrate the effectiveness of the proposed method. As a result, the proposed approach can assist the maintenance of power transformers and extend their operation life, as well as enhance their reliability. In order to effectively and reliably monitor power transformers in a substation, the Support Vector Machine is employed to develop Multi-Layer SVM Classifier based on pattern recognition and fault diagnosis system in the proposed approach. The Support Vector Machine is used to classify the specific patterns by DGA(dissolved gas analysis) is preprocessed through GSM data acquisition module collecting data, while the multi-layer SVM classifier is designed to identify the fault types of transformer. Finally, the collected data associated with both cases in IEC 60599 and historical data in Taipower system are selected for computer simulation to demonstrate the effectiveness of the proposed multi-layer SVM classifier. Further more, SVM1 and SVM2 proposed in this thesis are developed for case study and the satisfactory results compared with other AI methods can be achieved.
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Mukherjee, Prateep. "Active geometric model : multi-compartment model-based segmentation & registration." Thesis, 2014. http://hdl.handle.net/1805/4908.
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Indiana University-Purdue University Indianapolis (IUPUI)We present a novel, variational and statistical approach for model-based segmentation. Our model generalizes the Chan-Vese model, proposed for concurrent segmentation of multiple objects embedded in the same image domain. We also propose a novel shape descriptor, namely the Multi-Compartment Distance Functions or mcdf. Our proposed framework for segmentation is two-fold: first, several training samples distributed across various classes are registered onto a common frame of reference; then, we use a variational method similar to Active Shape Models (or ASMs) to generate an average shape model and hence use the latter to partition new images. The key advantages of such a framework is: (i) landmark-free automated shape training; (ii) strict shape constrained model to fit test data. Our model can naturally deal with shapes of arbitrary dimension and topology(closed/open curves). We term our model Active Geometric Model, since it focuses on segmentation of geometric shapes. We demonstrate the power of the proposed framework in two important medical applications: one for morphology estimation of 3D Motor Neuron compartments, another for thickness estimation of Henle's Fiber Layer in the retina. We also compare the qualitative and quantitative performance of our method with that of several other state-of-the-art segmentation methods.
Books on the topic "Laser diagnostic data"
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Mandra, Yuliya, Khiyir Abdulkerimov, Elena Svetlakova, Sergey Griroriev, N. Gegalina, Elena Semencova, Maria Vlasova, et al. Laser technology. ru: TIRAZH Publishing House, 2019. http://dx.doi.org/10.18481/textbook_5e061def49d1f9.63593775.
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The manual is intended for students of the Faculty of Dentistry, residents, practicing dentists of various specialties. Dedicated to current issues of laser dentistry. Developed taking into account world scientific and clinical practice, experimental, laboratory and clinical data obtained by the authors. This manual presents materials relating to modern ideas about the use of laser technology in dentistry, highlights modern methods of diagnosis and treatment, clinical cases are given.
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Eklöf, Bo, Kjell Lindström, and Stig Persson, eds. Ultrasound in Clinical Diagnosis. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199602070.001.0001.
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On October 29th 1953 in Lund, Sweden, Inge Edler, cardiologist, and Hellmuth Hertz, physicist, performed the first successful Ultrasoundcardiogram (UCG), later renamed Echocardiogram. A few weeks later, on December 16th, the neurosurgeon Lars Leksell diagnosed an intracranial bleeding in a 16-month-old boy using the same equipment, and Echoencephalography was born. The Lundensian obstetrician Bertil Sunden was in 1962 able to take the first ultrasound picture of twins in pregnancy. These three world premieres at the Lund University were the foundation for the tremendous development of diagnostic ultrasound. Before it is too late, the history in Lund will be told, and with this history as background Ultrasound in Clinical Diagnosis brings together some of the leading ultrasound experts of today to bring us up to date with the use of ultrasound in its ever-increasing importance for diagnosis in many areas of medicine. Peter wells writes in his Foreword that "this fascinating book serves more than one purpose: it is an historical record of the pioneering developments in clinical ultrasonic diagnosis that took place in Lund... what we now recognise as one of the greatest medical innovations of the twentieth century... Besides its historical content, this book also includes scholarly reviews of the state-of-art in adult and paediatric cardiology, obstetrics and gynaecology, vascular disease in several countries and, primarily from technical perspective, radiology, as well as an overview of contrast studies". Other chapters describe the development in ophthalmology and oto-rhino-laryngology as well as the industrial development of ultrasound equipment. This book will be valuable and interesting to those who are interested in the development of ultrasound diagnosis in medicine.
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Denniston, Alastair, and Philip Murray, eds. Oxford Handbook of Ophthalmology. Oxford University Press, 2014. http://dx.doi.org/10.1093/med/9780199679980.001.0001.
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Fully revised, the new third edition of the Oxford Handbook of Ophthalmology is a concise, systematic guide to all aspects of diagnosis, assessment, and ongoing management of ophthalmic diseases and conditions. Closely aligned with the curriculum for the ophthalmic postgraduate exams, and containing the most up-to-date clinical guidance and practical advice, this is the essential resource for all those caring for ophthalmic patients. It covers the key information for both trainees and specialists, from clinical methods and the use of ophthalmic instruments, to basic perioperative care and advanced life support protocols. It also includes new chapters covering laser procedures and theatre notes, as well as new sections on emerging technologies such as adaptive optics and gene therapy for retinal diseases.
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Xue, Yongkang, Yaoming Ma, and Qian Li. Land–Climate Interaction Over the Tibetan Plateau. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190228620.013.592.
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The Tibetan Plateau (TP) is the largest and highest plateau on Earth. Due to its elevation, it receives much more downward shortwave radiation than other areas, which results in very strong diurnal and seasonal changes of the surface energy components and other meteorological variables, such as surface temperature and the convective atmospheric boundary layer. With such unique land process conditions on a distinct geomorphic unit, the TP has been identified as having the strongest land/atmosphere interactions in the mid-latitudes.Three major TP land/atmosphere interaction issues are presented in this article: (1) Scientists have long been aware of the role of the TP in atmospheric circulation. The view that the TP’s thermal and dynamic forcing drives the Asian monsoon has been prevalent in the literature for decades. In addition to the TP’s topographic effect, diagnostic and modeling studies have shown that the TP provides a huge, elevated heat source to the middle troposphere, and that the sensible heat pump plays a major role in the regional climate and in the formation of the Asian monsoon. Recent modeling studies, however, suggest that the south and west slopes of the Himalayas produce a strong monsoon by insulating warm and moist tropical air from the cold and dry extratropics, so the TP heat source cannot be considered as a factor for driving the Indian monsoon. The climate models’ shortcomings have been speculated to cause the discrepancies/controversies in the modeling results in this aspect. (2) The TP snow cover and Asian monsoon relationship is considered as another hot topic in TP land/atmosphere interaction studies and was proposed as early as 1884. Using ground measurements and remote sensing data available since the 1970s, a number of studies have confirmed the empirical relationship between TP snow cover and the Asian monsoon, albeit sometimes with different signs. Sensitivity studies using numerical modeling have also demonstrated the effects of snow on the monsoon but were normally tested with specified extreme snow cover conditions. There are also controversies regarding the possible mechanisms through which snow affects the monsoon. Currently, snow is no longer a factor in the statistic prediction model for the Indian monsoon prediction in the Indian Meteorological Department. These controversial issues indicate the necessity of having measurements that are more comprehensive over the TP to better understand the nature of the TP land/atmosphere interactions and evaluate the model-produced results. (3) The TP is one of the major areas in China greatly affected by land degradation due to both natural processes and anthropogenic activities. Preliminary modeling studies have been conducted to assess its possible impact on climate and regional hydrology. Assessments using global and regional models with more realistic TP land degradation data are imperative.Due to high elevation and harsh climate conditions, measurements over the TP used to be sparse. Fortunately, since the 1990s, state-of-the-art observational long-term station networks in the TP and neighboring regions have been established. Four large field experiments since 1996, among many observational activities, are presented in this article. These experiments should greatly help further research on TP land/atmosphere interactions.
Book chapters on the topic "Laser diagnostic data"
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Alfredsson, P. H., R. Örlü, T. Kurian, J. H. M. Fransson, A. Segalini, J. D. Rüedi, and A. Talamelli. "The diagnostic plot - a new way to appraise turbulent boundary-layer data." In Springer Proceedings in Physics, 609–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03085-7_146.
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Kagan, Jeremy S. "Chronic Disease Self Management Using a Social Networking PHR/UHR." In Studies in Health Technology and Informatics. IOS Press, 2020. http://dx.doi.org/10.3233/shti200700.
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This viewpoint paper presents a potential solution to the “information islands” that are holding back PHR/UHR from becoming truly effective diagnostic information care management tools for patients especially those who suffer from chronic diseases. The solution involves integrating patient portal with a diagnostic data interface layer to create a single access point for caregivers and patients.
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Riveiro, Belen, Borja Conde-Carnero, and Pedro Arias-Sánchez. "Laser Scanning for the Evaluation of Historic Structures." In Civil and Environmental Engineering, 807–35. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-9619-8.ch034.
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In the last times, laser scanning is being massively used to perform reverse engineering of different built-up structures, both modern and historic ones, providing detailed geometry. This chapter presents an introduction to the technology so topics like the physic fundamentals of laser scanners, instrumentation (static and mobile platforms) and the advantages of each method. This chapter aims to illustrate the optimal application of laser scanning to the field of structural engineering in order to ease the adoption of the technology by engineers outside of the geomatic domain. The chapter presents a review of different case studies where laser scanning allowed very precise and very detailed geometric characterization of historic structures in order to obtain an objective diagnosis of their current state. Also, methodologies that permit the implementation of laser scanning products in structural calculation will be shown. Finally, up-to-date trends, mainly related to automatic and intelligent processing, of laser scanning data in historic structures are discussed.
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Riveiro, Belen, Borja Conde-Carnero, and Pedro Arias-Sánchez. "Laser Scanning for the Evaluation of Historic Structures." In Handbook of Research on Seismic Assessment and Rehabilitation of Historic Structures, 765–93. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8286-3.ch026.
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In the last times, laser scanning is being massively used to perform reverse engineering of different built-up structures, both modern and historic ones, providing detailed geometry. This chapter presents an introduction to the technology so topics like the physic fundamentals of laser scanners, instrumentation (static and mobile platforms) and the advantages of each method. This chapter aims to illustrate the optimal application of laser scanning to the field of structural engineering in order to ease the adoption of the technology by engineers outside of the geomatic domain. The chapter presents a review of different case studies where laser scanning allowed very precise and very detailed geometric characterization of historic structures in order to obtain an objective diagnosis of their current state. Also, methodologies that permit the implementation of laser scanning products in structural calculation will be shown. Finally, up-to-date trends, mainly related to automatic and intelligent processing, of laser scanning data in historic structures are discussed.
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Markov, Krassimir, Koen Vanhoof, Iliya Mitov, Benoit Depaire, Krassimira Ivanova, Vitalii Velychko, and Victor Gladun. "Intelligent Data Processing Based on Multi-Dimensional Numbered Memory Structures." In Diagnostic Test Approaches to Machine Learning and Commonsense Reasoning Systems, 156–84. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-1900-5.ch007.
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The Multi-layer Pyramidal Growing Networks (MPGN) are memory structures based on multidimensional numbered information spaces (Markov, 2004), which permit us to create association links (bonds), hierarchically systematizing, and classification the information simultaneously with the input of it into memory. This approach is a successor of the main ideas of Growing Pyramidal Networks (Gladun, 2003), such as hierarchical structuring of memory that allows reflecting the structure of composing instances and gender-species bonds naturally, convenient for performing different operations of associative search. The recognition is based on reduced search in the multi-dimensional information space hierarchies. In this chapter, the authors show the advantages of using the growing numbered memory structuring via MPGN in the field of class association rule mining. The proposed approach was implemented in realization of association rules classifiers and has shown reliable results.
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Riveiro, B., B. Conde, G. A. Drosopoulos, G. E. Stavroulakis, and M. E. Stavroulaki. "Fully automatic approach for the diagnosis of masonry arches from laser scanning data and inverse finite element analysis." In Structural Analysis of Historical Constructions: Anamnesis, Diagnosis, Therapy, Controls, 133–39. CRC Press, 2016. http://dx.doi.org/10.1201/9781315616995-16.
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Parmar, Yuvrajsinh J., and Itzhak Kronzon. "Aortic sclerosis: clinical signs and diagnosis." In ESC CardioMed, edited by Raimund Erbel, 2582–83. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0612.
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Atherosclerotic changes in the aorta result in progressive accumulation of cholesterol and other lipids in the intimal–medial layer with secondary inflammation, fibrous tissue deposition, surface erosions (ulcers), and plaque formation. The plaques and ulcers are associated with clot formation and emboli resulting in a variety of clinical symptoms. Modern imaging technologies such as contrast-enhanced computed tomography, magnetic resonance imaging, and echocardiography are used in the diagnosis; however, transoesophageal echocardiography remains the gold standard for plaque visualization in the thoracic aorta. Treatment strategies revolve around risk factor reduction and management of general atherosclerosis, as there are no other proven therapies to date.
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Tsipouras, Markos G., Themis P. Exarchos, Dimitrios I. Fotiadis, Aris Bechlioulis, and Katerina K. Naka. "Decision Support Systems for Cardiovascular Diseases Based on Data Mining and Fuzzy Modelling." In Encyclopedia of Healthcare Information Systems, 391–99. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-889-5.ch051.
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This article addresses the decision support regarding cardiovascular diseases, using computer-based methods, focusing on the coronary artery disease (CAD) diagnosis and on the prediction of clinical restenosis in patients undergoing angioplasty. Methods reported in the literature are reviewed with respect to (i) the medical information that are employing in order to reach the diagnosis and (ii) the data analysis techniques used for the creation of the CDSSs. In what concerns medical information, easily and noninvasively-obtained data present several advantages compared to other types of data, while data analysis techniques that are characterized by transparency regarding their decisions are more suitable for medical decision making. A recently developed approach that complies with the above requirements is presented. The approach is based on data mining and fuzzy modelling. Using this approach, one CDSS has been developed for each of the two cardiovascular problems mentioned above. These CDSSs are extensively evaluated and comments about the discovered knowledge are provided by medical experts. The later is of great importance in designing and evaluating CDSSs, since it allows them to be integrated into real clinical environments.
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Esquivel-Velázquez, Marcela, Carlos Larralde, Pedro Ostoa-Saloma, Víctor Hugo Del Río Araiza, and Jorge Morales-Montor. "The Long Road to the Immunodiagnosis of Neurocysticercosis: Controversies and Confusions." In Current State of the Art in Cysticercosis and Neurocysticercosis [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98723.
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To date, even widely studied, there is not a standard diagnostic method to detect neurocysticercotic patients. The later due to the complex nature of cysticercosis disease and the simplicity of common immunological assumptions involved in explaining the low scores and reproducibility of immunotests in the diagnosis of neurocysticercosis. To begin with, the few studies dealing with the immune response during neurocysticercosis are not conclusive, which of course it is crucial to develop an immunodiagnostic test. Their full recognition should clear confusion and reduce controversy as well as provide avenues of research and technological design. In here, logical arguments add that even under common immunological assumptions, serology of neurocysticercosis will always include false negative and positive results. Thus, serology is no strong support for medical diagnosis of neurocysticercosis (NC). In contrast, immunotests performed in the cerebrospinal fluid (CSF) of neurological patients should have fewer false positive and fewer false negatives than in serum. To conclude, it is argued that high scores in serology for NC will not yield to usual approaches and that success needs of a concerted worldwide effort. A more punctilious strategy based on the design of panels of confirmed positive and negative sera needs to be construed, shared and tested by all interested groups to obtain comparable results. The identification of a set of specific and representative antigens of Taenia solium (T. solium) and a thorough compilation of the many forms of antibody response of humans to the many forms of T. solium disease are also to be considered as one of the most importants factors to the disease.
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Kopacz, Dorota, Łucja Niezgoda, Ewa Fudalej, Anna Nowak, and Piotr Maciejewicz. "Tear Film – Physiology and Disturbances in Various Diseases and Disorders." In Ocular Surface Diseases - Some Current Date on Tear Film Problem and Keratoconic Diagnosis. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.94142.
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The tear film is a thin fluid layer covering the ocular surface. It is responsible for ocular surface comfort, mechanical, environmental and immune protection, epithelial health and it forms smooth refractive surface for vision. The traditional description of the tear film divides it into three layers: lipid, aqueous and mucin. The role of each layer depends on the composition of it. Tear production, evaporation, absorption and drainage concur to dynamic balance of the tear film and leads to its integrity and stability. Nonetheless, this stability can be disturb in tear film layers deficiencies, defective spreading of the tear film, in some general diseases and during application of some general and/or topical medications. Dry eye disease is the result of it. In this review not only physiology of the tear film is presented. Moreover, we would like to discuss the influence of various diseases and conditions on the tear film and contrarily, spotlight tear film disorders as a manifestation of those diseases.
Conference papers on the topic "Laser diagnostic data"
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Abdelli, Khouloud, Helmut Griesser, and Stephan Pachnicke. "Machine Learning Based Data Driven Diagnostic and Prognostic Approach for Laser Reliability Enhancement." In 2020 22nd International Conference on Transparent Optical Networks (ICTON). IEEE, 2020. http://dx.doi.org/10.1109/icton51198.2020.9203551.
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Ballal, D. R., T. H. Chen, and W. J. Schmoll. "Laser Diagnostics for Gas Turbine Combustion Research." In ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/88-gt-128.
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Gas turbine combustors pose many modeling and design difficulties. This has created an urgent need for experimental research using laser diagnostics to validate and refine computer design models of combustors. In this paper, key practical problems, limitations, and our operational experience with laser diagnostic systems for gas turbine combustion research are described. It is found that unavailability of a good LDA seeder design and an unambiguous particle bias correction scheme present the main obstacles to using LDA in gas turbine combustor measurements. The practical problems of the Raman/Rayleigh system, particularly above 1200 K are high background luminosity, beam steering due to unmixedness, and high Poisson uncertainty in temperature and concentration measurements. The integration of LDA-Raman systems is beset by optical and data acquisition difficulties. Therefore, considerable work is still required to make the applications of advanced laser diagnostics to measurements in a practical gas turbine combustor a reality.
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Beseler, Kaylyn, Ankit Tyagi, and Jacqueline A. O'Connor. "Development of a Diagnostic Damkohler Number for Interpreting Laser-Induced Fluorescence Data in Turbulent Flames." In AIAA Scitech 2020 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-2278.
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Sipkens, T. A., N. Petermann, K. J. Daun, J. Titantah, M. Karttunen, H. Wiggers, T. Dreier, and C. Schulz. "In Situ Particle Size Measurements of Gas-Borne Silicon Nanoparticles by Time-Resolved Laser-Induced Incandescence." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17246.
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The functionality of silicon nanoparticles is strongly size-dependent, so there is a pressing need for laser diagnostics that can characterize aerosolized silicon nanoparticles. The present work is the first attempt to extend time-resolved laser-induced incandescence (TiRe-LII), a combustion diagnostic used for sizing soot, to size silicon nanoparticles. TiRe-LII measurements are made on silicon nanoparticles synthesized in a low-pressure plasma reactor containing argon. Molecular dynamics (MD) is used to predict the accommodation coefficient between silicon nanoparticles and argon and helium, which is needed to interpret the TiRe-LII data. The MD-derived thermal accommodation coefficients will be validated by comparing them to experimentally-derived values found using transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) analysis.
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Anderson, James P., Alejandro Camou, Eric L. Petersen, Mark Harris, and David M. Cusano. "Carbon Monoxide Emission Measurements From a Supercritical CO2 Combustor Rig Using a Mid-Infrared Laser Absorption Diagnostic." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91779.
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Abstract A rugged, mid-infrared (IR) CO laser absorption diagnostic has been developed to monitor the amount of CO produced by a high-pressure CH4-O2 combustor test rig operating at supercritical CO2 conditions (30 MPa and 1150°C). The laser system operates at the fundamental absorption band, ν″ = 0, R(12), of CO near 4.5 μm. The mid-IR diagnostic was constructed from a tunable quantum cascade laser (QCL), an absorption cell with two window ports for monitoring CO exhaust concentration, and two IR photodetectors. Temperature and pressure sensors were mounted near the absorption cell to monitor exhaust flow conditions, and the operational wavelength of the laser was determined by a calibration process using a known mixture of CO and N2. Environmental conditions at the remote outdoor test facility posed significant difficulties in the data acquisition process for the IR diagnostic. Fluctuating environmental temperatures proved to be problematic when operating cryogenic photodetectors and stabilizing a QCL designed to operate with an internal temperature of −15°C. Improvements to the IR system included elimination of problematic stagnation regions via a new absorption cell design and an increase in the CO detection limit. During steady state conditions, the mid-IR diagnostic measured the CO concentration to within ± 80.6 ppm. The IR diagnostic was shown to have superior CO detection response time and the ability to resolve features not detected by other CO detector counterparts.
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Leask, Scott B., Alice K. Li, Vincent G. McDonell, and Scott Samuelsen. "Preliminary Development of a Measurement Standard Using a Research Simplex Atomizer." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87940.
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Cold-flow spray researchers have an array of diagnostic tools to extract meaningful information on spray characteristics. The efficacy of many of these tools, however, depends heavily on calibration, alignment, and human operation. This can lead to large discrepancies in data values for seemingly identical setups between workers. The application of experimental data to numerical models is thereby hindered due to inconsistencies in results caused by experimental error. Previously, an attempt was made to produce a “standard spray” through the use of a research simplex atomizer (RSA). As manufacturing processes and diagnostic tools have improved, the research simplex atomizer is being revisited. Here, a new research simplex atomizer has been investigated. Fundamental datasets captured from detailed test conditions are presented to provide benchmark data with the intention of other workers testing the reproducibility of the results. Preliminary findings between laboratories show good agreement in droplet size measurements. Further, emphasis is placed on the sensitivity of laser diagnostics used and the effect their operation can incur. To satisfy the requirements of a measurement standard, it is paramount that all workers adhere to similar diagnostic configurations and detail their operating parameters.
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Nakajima, Keyaki, Eiichirou Tanaka, Kazunari Okabe, Hitoshi Takebe, Kazuteru Nagamura, Kiyotaka Ikejo, Shinji Hashimura, Keiichi Muramatsu, Keiichi Watanuki, and Ryozo Nemoto. "Development of the Easy Set-Up and In Situ Automatic Gear Diagnostic System Using a Laser Beam." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47252.
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We developed a method which can diagnose damage on a gear tooth surface by using laser beam without a rotary encoder. This method is as follows: 1) The tooth bottom, the tooth tip and their two medians are detected by the differentials of the laser reflection data. 2) The gear rotation speed is calculated with these four positions, and interpolated according to the rotation fluctuation. 3) By using the calculated gear rotation speed, the measured data can be converted corresponding to the gear rotation angle. Thus we diagnose gear tooth surface damage without being influenced by rotational fluctuation. We did diagnosis experiments and we made contour maps show diagnosis accuracy. From these maps, we got the following conclusions: 1) The accuracy of damage diagnosis is the same level regardless of the presence or absence of a rotary encoder. 2) The cycle of rotational fluctuation hardly affects the accuracy. 3) Bigger fluctuation amplitude makes the range accuracy worse, however the position accuracy improves.
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Tanaka, Eiichirou, Yuta Kojima, Hiroki Yoshimi, Kazunari Okabe, Hitoshi Takebe, Satoshi Wada, Kazuteru Nagamura, Kiyotaka Ikejo, and Ryozo Nemoto. "Development of a Diagnosis Method of a Gear Tooth Surface by Predicting Laser Beam Reflection." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12993.
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We developed a new diagnostic method by using a laser beam. This method is as follows: A tooth surface is irradiated by the zonal laser beam from an oblique direction, and then the irradiated laser beam line is shifted along the surface of the tooth according to gear rotation. If the damage on the irradiated tooth surface exists, the voltage proportional to laser reflection increases. We developed the method to predict and make the reflection benchmark on the normal condition according to the gear surface. To make the benchmark of the diagnosis, the three dimensional basic-data map (x: irradiated angle, y: irradiated distance, z: reflection intensity) was created by measuring the gear only whose material, heat treatment, and roughness were same as the targeted gear. By using the equations of tooth profile and fillet curves calculated from the specifications of the targeted gear, the distance and angle relations between the laser sensor and the tooth surface can be derived. By using the three dimensional basic-data map, the benchmark can be created. The measured reflection data of the non-damage gear agreed well with the benchmark, therefore we can diagnose the various specification gears, if the targeted gear’s material, heat treatment, and roughness are same. Finally, by using the benchmark which was made by our developed method, we proposed a novel diagnosis method. The procedure of the method is as follows: 1) The benchmark is made from the targeted gear’s specifications. 2) To take into account the fluctuation of the benchmark line influenced by the roughness on the gear surface, normal condition area of the reflected data is defined in the range between −0.05 V and +0.05 V of the benchmark line. 3) The normal condition area and measured data is compared, if the measured data is deviated from the normal condition area, there is defined as the abnormal area possible to be damaged. To confirm the validity of this diagnosis method, the measured value of the damage area with caliper directly and calculated value from the method as mentioned above. The errors of the area and the location were within 20 %. Therefore, the effectiveness of the method using the benchmark data can be confirmed.
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Varner, Elizabeth B., Chi-Lin (Kenny) Young, Hung M. (Paul) Ng, Steven P. Maher, Travis M. Eiles, and Birk Lee. "Single Element Time Resolved Emission Probing for Practical Microprocessor Diagnostic Applications." In ISTFA 2002. ASM International, 2002. http://dx.doi.org/10.31399/asm.cp.istfa2002p0741.
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Abstract This paper presents the first single element time resolved emission (TRE) data collected from microprocessors fabricated with 0.13 µm process silicon using tester loop lengths, and in many cases acquisition times, comparable to laser voltage probing. The data presented here demonstrate that TRE tools with highly sensitive single element detectors can be used for practical microprocessor circuit diagnostics with reasonable acquisition times.
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Lee, T. W., N. Hegde, and I. Han. "In-Situ Diagnostics of Combustion Parameters Using Laser-Induced Breakdown Spectroscopy." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72517.
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Laser-Induced breakdown spectroscopy is a powerful diagnostic method that can be applied to combustion systems for measurements of fuel-air ratios, fuel composition, and temperature. In this study, we specifically show the application of LIBS for in-situ flame temperature measurements at conditions up to moderately sooting conditions (equivalence ratio of 15 for methane-air flames). Comparisons with existing data obtained from thermocouple exhibit excellent agreement in weakly sooting flames and good agreement at higher equivalence ratios. The deviation at higher equivalence ratios is attributed to signal trapping due to soot and precursor species and also due to increase in hydrogen spectral signal at these conditions. These are factors that can be circumvented and do not preclude application of LIBS to highly sooting flames.
Reports on the topic "Laser diagnostic data"
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Lucht, Robert, and William Anderson. Structure and Dynamics of Fuel Jets Injected into a High-Temperature Subsonic Crossflow: High-Data-Rate Laser Diagnostic Investigation under Steady and Oscillatory Conditions. Office of Scientific and Technical Information (OSTI), January 2015. http://dx.doi.org/10.2172/1222578.
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