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Relevant bibliographies by topics / Spectral transmittance

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Academic literature on the topic 'Spectral transmittance'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 June 2025

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Journal articles on the topic "Spectral transmittance"

1

Malik, Zvi, Chana Rothmann, Tova Cycowitz, Zwi J. Cycowitz, and Amos M. Cohen. "Spectral Morphometric Characterization of B-CLL Cells Versus Normal Small Lymphocytes." Journal of Histochemistry & Cytochemistry 46, no. 10 (1998): 1113–18. http://dx.doi.org/10.1177/002215549804601003.

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Spectral morphometric characterization of typical chronic lymphocytic leukemia (B-CLL) cells vs normal small lymphocytes stained by May-Grunwald-Giemsa was carried out by multipixel spectral imaging. The light intensity (450–850 nm of 104 pixels) from nuclear domains of each stained cell was recorded and represented as light transmittance spectra and optical density. Transmitted light spectra of two nuclear domains were determined, one with low-intensity light transmittance (LIT) and the other with high-intensity light transmittance (HIT). A spectral library was constructed using the four transmitted light spectra representing the HIT and LIT domains of the normal human lymphocytes and the LIT and HIT domains of the CLL cells. The spectral library served to scan CLL lymphocytes from 10 cases of CLL and the lymphocytes of 10 healthy individuals. Each spectrally similar domain in the nuclei of the lymphocytes was assigned an arbitrary color. The morphometric analysis of the spectrally classified nuclei showed specific spectral patterns for B-CLL in 92% of the cells. The specific spectral characteristics of each of the two cell populations were also observed by their optical density light absorbance spectra. We propose that spectral morphometric analysis may serve as an additional diagnostic tool for detection of CLL lymphocytes in a hematological specimen.

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ZUBOV, Roman Nikolaevich. "Development of criteria for determining the color saturation of gemstones." NEWS of the Ural State Mining University 1, no. 1 (2020): 86–95. http://dx.doi.org/10.21440/2307-2091-2020-1-86-95.

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The urgency of the problem is conditioned by spectral methods development providing objectivity and accuracy of gemstones color grading. The purpose of the work: working-out the criteria which allows to determine gemstones saturation based on physicsmathematics patterns and spectral data. Methodology of the research: studying of colored gemstones transmittance spectra, discovery of the regularities and development of physics-mathematics methods for the color saturation grading. Results. The absolute and relative criteria for gemstone saturation grading was suggested as ratio of difference between light transmittance to squared difference between wavelengths at the area of basic chromophore element. Experimental data and allochromatic gemstones saturation calculation examples were presented considering spectral sensitivity of human eye. Summary. Gemstones absorption and transmittance spectra research allows to define tone and saturation gemstone color features. To improve tone and saturation definition accuracy, it is necessary to select standard hue of gemstones for wavelengths scale graduating along with spectral sensitivity of human eye.

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Kanayama, K., and H. Baba. "Transmittance of Distilled Water and Sodium-Chloride-Water Solutions." Journal of Solar Energy Engineering 110, no. 2 (1988): 113–19. http://dx.doi.org/10.1115/1.3268240.

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The spectral transmittance of pure water and salt water solutions of various concentrations, which are important for the thermal calculation of a solar pond, is measured experimentally for specimen thickness of 1 to 100 mm by means of an autorecording spectro-radiometer inside an air-conditioned room. On the basis of the measured spectral transmittance, the total transmittance of pure and salty waters to 3 m of water depth is calculated as a ratio of the total radiation energy over all wavelengths arriving at any depth from the water surface of the solar pond to the solar radiation incident upon the water surface with various air masses. According to Nielsens’ four-partition method, the effective absorption coefficient is calculated for each wavelength band. Lastly, the transmission properties obtained for pure water, i.e., spectral and total transmittances, absorption wavelength band, and effective absorption coefficient, are compared with past results, and those for salty water with various concentrations are compiled as basic data for the use of solar energy by a solar pond.

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Hareland, Willard A., Stephen E. Grant, Steven P. Ward, and David R. Anderson. "Computer-Controlled Densitometer for the Analysis of Photographically Recorded Optical Emission Spectra." Applied Spectroscopy 41, no. 8 (1987): 1422–27. http://dx.doi.org/10.1366/0003702874447031.

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A computer-controlled densitometer for data acquisition and high speed analysis of photographically recorded optical emission spectra has been developed. The instrument scans and digitizes spectra and stores the data sequentially in computer memory. A high-resolution linear measurement transducer mounted on a Jarrell-Ash densitometer monitors the plate position as the spectrum is scanned. The transducer measurement is accurate to within 0.001% over a range of about 340 mm on a glass photoplate. Computer algorithms for locating and identifying peaks and for calculating the wavelengths of spectral lines from their positions in the spectrum are described. With the use of a calibration curve based on the measured positions of three known spectral lines, the wavelength of any spectral line can be determined to within 0.005 nm, and the transmittance of a peak in the recorded spectrum can be measured to within 1%. The wavelengths and transmittances of all detectable spectral lines in the digitized emission spectrum are determined in less than two minutes.

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Reiss, Stephan, Karsten Sperlich, Martin Kunert, et al. "Visualization of IOL Material-Induced Changes in Retinal Color Stimulus." Journal of Ophthalmology 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/4680621.

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Purpose. Different IOL materials, particularly blue-light filtering materials, have different spectral transmittance characteristics. The color stimuli, which influence retinal receptors objectively, have consequently implications for color perception. We report on the quantitative determination of IOL-specific transmittance characteristics and present a method visualizing the resultant changes in color stimulus.Methods. A setup was realized to quantify IOL-absorption in a range of 390–780 nm. To visualize the influence of the different spectral transmittance characteristics an algorithm was developed, which converts RGB-pixel values of images into spectra, which performs the corresponding transmittance correction, reconverts to RGB, and reconstructs the image. IOLs of hydrophobic acrylate and hydrophilic acrylate with a hydrophobic surface in each case with/without blue-light filter were examined.Results. Assessment of the reference images verifies the suitability of the pipeline. Evaluation of the transmittance spectra reveals differences of material- and manufacturer-specifics, which are capable of inducing considerable changes in color perception, particularly in the blue color range and mixed colors involving blue.Conclusions. The developed technique provides an approach for determining IOL-specific transmittance behavior and subsequently its influence on the retinal color stimulus. Problems of altered color perception are occasionally reported after cataract surgery and these become obvious with the visualization procedure developed here.

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Bierman, Andrew, Mariana G. Figueiro, and Mark S. Rea. "Measuring and predicting eyelid spectral transmittance." Journal of Biomedical Optics 16, no. 6 (2011): 067011. http://dx.doi.org/10.1117/1.3593151.

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7

Manoochehri, Farshid, Erkki Ikonen, and Leif Liedquist. "Comparison measurements on regular spectral transmittance." Color Research & Application 21, no. 6 (1996): 440–47. http://dx.doi.org/10.1002/(sici)1520-6378(199612)21:6<440::aid-col6>3.0.co;2-w.

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8

Gorgels, Theo G. M. F., and Dirk Van Norren. "Spectral transmittance of the rat lens." Vision Research 32, no. 8 (1992): 1509–12. http://dx.doi.org/10.1016/0042-6989(92)90206-x.

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Mätzler, Christian. "A simple snowpack/cloud reflectance and transmittance model from microwave to ultraviolet: the ice-lamella pack." Journal of Glaciology 46, no. 152 (2000): 20–24. http://dx.doi.org/10.3189/172756500781833476.

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AbstractModeling the reflectance and transmittance of strong volume scatterers is a delicate task. Slightly different approaches can lead to different results, making comparisons difficult. Here a simple, analytic multiple-scattering model is presented as a possible reference for comparisons and also for better understanding of the physics involved. The model quantifies the transmittance and reflectance of homogeneously distributed scatterers within slabs of any thickness. The simplicity of the model is given by the one-dimensional geometry, a system consisting of freely arranged ice lamellae in air. Although direct application of the model will be limited, it gives a spectral description of ice clouds and snowpacks over a very broad spectral range from microwave to ultraviolet. As well as the transmittance and reflectance, the model gives the emittance through Kirchhoff’s law. Comparison with other models shows, on the one hand, agreement with current snow models in the spectral description, and on the other, some quantitative inconsistencies between all of them. It appears that the lamella pack produces the same optical spectra as an average snow model, with spherical ice grains whose radius corresponds to about the lamella thickness, whereas microwave spectra appear to be slightly different.

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Hawryshyn, Craig W., B. Ralph Chou, and Ross D. Beauchamp. "Ultraviolet transmission by the ocular media of goldfish: implications for ultraviolet photosensitivity in fishes." Canadian Journal of Zoology 63, no. 6 (1985): 1244–51. http://dx.doi.org/10.1139/z85-186.

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Spectral transmittance of goldfish (n = 10) ocular media was measured in the 320- to 750-nm range with a spectrophotometer modified to eliminate problems associated with chromatic aberration and beam scattering. Absolute transmittance in the visible range was 0.8 at 400 nm and 0.95 at 750 nm. Transmittance below 400 nm dropped off to 0.3 at 340 nm and exhibited high variability between individuals. Linear regression analysis showed that ultraviolet (UV) transmittance was not systematically related to age, body weight, standard length, or ocular diameter of fish. Low UV transmittance of the ocular media was shown to influence the UV peak spectral sensitivity by narrowing the action spectrum on the short wavelength side and displacing the UV peak sensitivity to longer wavelengths. Correcting spectral sensitivity curves for ocular media transmittance resulted in agreement with λmax 370 nm absorption spectrum.

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Dissertations / Theses on the topic "Spectral transmittance"

1

Pettegrew, Richard Dale. "Radiative Characteristics of a Thin Cellulosic Fuel at Discrete Levels of Pyrolysis: Angular, Spectral, and Thermal Dependencies." Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1133741679.

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Nandiguim, Lamaï. "Etude du comportement magnétique et spectral de l'effet Faraday dans des oxydes métalliques dopés par des nanoparticules magnétiques de ferrite de cobalt." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES015/document.

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Ce travail de thèse est consacré à l’étude des propriétés magnéto-optiques de nanoparticules (NP) magnétiques de ferrite de cobalt (CoFe2O4) sous forme liquide et lorsqu’elles sont bloquées dans une matrice de silice produite par voie sol-gel. Cette dernière dispersion constitue un matériau composite à activité magnéto-optique obtenu par un procédé basse température qui le rend totalement compatible avec les technologies d’intégration. A plus long terme, ce matériau pourra contribuer à l’intégration de composants non-réciproques. L’objectif de ce travail est d’une part l’identification du type de NP qui maximise la rotation Faraday et le facteur de mérite (rapport de la rotation Faraday à l’absorption) dans le but d’améliorer la qualité magnéto-optique du matériau composite. Et d’autre part, il s’agit d’améliorer la compréhension des phénomènes physiques liés aux effets magnéto-optiques de ces nanoparticules et le lien avec leurs caractéristiques physiques. L’étude est menée sur des NP magnétiques synthétisées et dispersées en phase aqueuse au laboratoire PHENIX (UMR CNRS 8234). Les mesures optiques et magnéto-optiques réalisées au laboratoire Hubert Curien (UMR CNRS 5516) ont été complétées par des mesures magnétiques XMCD au synchrotron SOLEIL. L’étude des différentes nanoparticules magnétiques a révélé que l’utilisation d’une petite taille de NP permet de multiplier par deux le facteur de mérite du matériau pour une longueur d’onde de 1,5 µm, soit une division par deux des pertes pour les composants magnéto-optiques visés. L’analyse du comportement spectral de l’effet Faraday illustre l’influence de la distribution cationique des ions Co2+ et Fe3+ dans la structure cristalline. Couplée aux mesures XMCD, l’analyse montre le besoin d’une localisation de l’ion Co2+ en site tétraédrique dans la structure spinelle pour maximiser l’effet Faraday à 1,5µm, et obtenir une anisotropie uniaxe qui permette une pré-orientation aisée des NP lors de la gélification<br>This work is dedicated to the study of the magneto-optical properties of cobalt ferrite (CoFe2O4) nanoparticles (NP) dispersed in liquid as ferrofluid, or blocked in a solid silica matrix realized with a sol-gel method. This last dispersion is a magneto-optical composite material, obtained with a low temperature process which insures its compatibility with photonic integration technologies, to produce, in the future, integrated non-reciprocal devices. The aim of the study is, on one hand, to identify which kind of NP can improve the Faraday effect and the merit factor (ratio between the Faraday effect and the absorption) of the composite material. On the other hand, the aim is to give a better understanding of the link between the magneto-optical properties and the physical characteristics of the NP. The study has been led on NP synthetized and dispersed as ferrofluid in PHENIX laboratory (UMR CNRS 8234). Optical and magneto-optical measurements were made in Hubert Curien laboratory (UMR CNRS 5516) and completed by XMCD analysis in Synchroton SOLEIL. Results show that it is necessary to use a small size of NP (5 nm) to maximize the merit factor at a wavelength of 1,5 µm. The spectral analysis of the Faraday effect shows the influence of the cationic distribution of Co2+ et Fe3+ in the spinelle structure. Coupled to XMCD results, this analysis shows that it is necessary to maximize the quantity of Co2+ in tetraedric sites to maximize the Faraday effect at 1,5 µm and to obtain an uniaxial anisotropy which allows to orientate the NP during the gelification of the sol-gel matrix

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Mazauric, Serge. "Modèles spectraux à transferts de flux appliqués à la prédiction de couleurs sur des surfaces imprimées en demi-ton." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES064/document.

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La protection des documents fiduciaires et identitaires contre la fraude exige le développement d’outils de contrôle fondés sur des effets visuels sans cesse renouvelés, difficiles à contrefaire (même pour un expert ... de la contrefaçon !). Ce projet de recherche s’inscrit dans cette problématique et vise à apporter des solutions originales via l’impression de supports diffusants d’une part, et le développement de modèles de rendu visuel d’autre part. Les effets visuels recherchés sont des ajustements de couleurs entre les deux faces d’un imprimé lorsque celui-ci est observé par transparence devant une source lumineuse. Pour obtenir facilement des ajustements de couleurs quelles que soient les couleurs visées, il est capital d’avoir un modèle à disposition, permettant de calculer les quantités d’encre à déposer. Un modèle doit être capable de prédire les facteurs spectraux de réflexion et de transmission du support imprimé en décrivant les phénomènes de diffusion optique présents en pratique dans les couches d’encre et le support. Nous nous intéressons plus particulièrement aux imprimés translucides contenant des couleurs en demi-ton des deux côtés de la surface avec pour objectif de prédire le rendu visuel pour diverses configurations d’observation. Pour cela, nous proposons une nouvelle approche basée sur l’utilisation de matrices de transfert de flux pour prédire les facteurs spectraux de réflexion et de transmission des imprimés lorsqu’ils sont éclairés simultanément des deux côtés. En représentant le comportement optique des différents composants d’un imprimé par des matrices de transfert, la description des transferts de flux entre ces composantes s’en trouve simplifiée. Ce cadre mathématique mène à la construction de modèles de prédiction de couleurs imprimées en demi-ton sur des supports diffusants. Nous montrons par ailleurs que certains modèles existants, comme le modèle de Kubelka-Munk ou encore le modèle de Clapper-Yule, peuvent également être formulés en termes de matrices de transfert. Les résultats obtenus avec les modèles proposés dans ce travail mettent en évidence des qualités de prédiction équivalentes, voire supérieures, à celles qu’on retrouve dans l’état de l’art, tout en proposant une simplification de la formulation mathématique et de la description physique des échanges de flux. Cette simplification fait de ces modèles des outils de calcul qui s’utilisent très facilement, notamment pour la détermination des quantités d’encre à déposer sur les deux faces de l’imprimé afin d’obtenir des ajustements de couleurs<br>The protection of banknotes or identity documents against counterfeiting demands the development of control tools based on visual effects that are continuously renewed. These visual effects become thus difficult to counterfeit even by an expert forger ! This research tries to deal with that issue. Its objective is to bring new solutions using on the one side, the printing of diffusing materials, and on the other side the development of visual rendering models that can be observed. The visual effects that are sought-after are the color matching on both sides of a printed document when observed against thelight. To easily obtain a color matching, whatever the colors that are aimed for, it is essential to have a model that helps in calculating the quantity of ink to be left on the document. A model must be used to predict the spectral reflectance and the transmittance factors of the printed document by describing the phenomena of optical diffusion really present in the ink layers and in the document. We shall focus our interest especially on translucent printed documents that have halftone colors on both sides. Our goal here is to predict the visual rendering in different configurations of observation. To that end, we are offering a new approach based on the use of flux transfer matrices to predict the spectral reflectance and transmittance factors of prints when they are simultaneously lit up on both sides. By representing with transfer matrices the optical behavior of the different components present in a printed document, we see that the description of flux transfer between these elements is thus simplified. This mathematical framework leads to the construction of prediction models of halftone printed colors on diffusing materials. We also show that some existing models, such as the Kubelka-Munk or the Clapper-Yule models, can also be formulated in transfer matrices terms. The results that we get with the models used in this work make apparent identical prediction quality and in some cases even better ones to the ones found in the state of the art, while offering a simplification of the mathematical formulation and the physical description of the flux transfer. This simplification thus transforms these models into calculation tools that can easily be used especially for the choice of quantities of ink that must be left on both sides of the document in order to obtain color matching

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Guilbert, Gérard. "Étude des caractéristiques optiques de milieux poreux semi-transparents." Nancy 1, 1985. http://docnum.univ-lorraine.fr/public/SCD_T_1985_0225_GUILBERT.pdf.

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Le travail effectué dans ce mémoire concerne l'étude des caractéristiques optiques d'un milieu poreux semi-transparent. Ce milieu composé de fibres, absorbe et diffuse la lumière, c'est un milieu absorbant-diffusant. La théorie électromagnétique permet l'accès aux coefficients monochromatiques d'absorption et de diffusion, à partir de l'indice de réfraction de la phase solide du milieu. Nous avons construit une installation permettant de tester cette théorie en mesurant la transmittance spectrale sur des échantillons de différentes épaisseurs. La confrontation entre les calculs et l'expérience est très satisfaisante du point de vue optique, ce qui confère une certaine validité à la théorie utilisée

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CHIANG, ZONG-ZHE, and 江宗哲. "Research on Spectral Transmittance of IR Absorption Filter Annealing Process." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ambhsw.

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碩士<br>臺北城市科技大學<br>機電整合研究所<br>107<br>This paper focuses on an optical glass that absorbs infrared light by the material itself. This infrared absorbent filter is made of chemical formula mixed into powder, and then manufactured by high temperature melting, annealing process, precision processing and other procedures, wherein the main impact on spectral penetration values is in the formulation composition. However, in this optical glass material on the sensitive nature of temperature, different annealing process will also cause the impact on spectral penetration rate, the extent of which is worth exploring in depth. The study spindle is planned into two parts of the experimental stage, the first part for the glass test film production, in order not to change the chemical composition of the glass itself, with high temperature melting manufacturing procedures, only the annealing process to do temperature, time changes to do group production. The second part will be the test film with spectrometer individual measurement, and then explore the analysis of the spectral penetration rate of the numerical change severity. The experimental results show that: the temperature increase, will cause the maximum penetration significantly decreased, infrared light penetration will increase slightly. Lower temperatures can cause a significant increase in maximum penetration.

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Van, der Westhuyzen Jacobus Gideon Johannes. "An investigation into the application of light sources in the treatment of glaucoma." Diss., 1999. http://hdl.handle.net/2263/22863.

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Glaucoma is a blinding disease characterized by damage to the optic nerve and often caused by an increase in the intra-ocular pressure. Glaucoma affects from 2% to 8% of the South African population, depending on race and age. Primary Open-angle Glaucoma (POAG) is found mostly in patients above the age of 40 years. POAG is more prevalent in black people, with the number of black persons contracting the disease double that of persons of European origin. In South Africa, the prevalence of blindness is estimated to be 0,6%, thus 240 000 out of a total of 40 million. Glaucoma is responsible for an estimated 20% of the total number of blind people, thus approximately 48 000. The treatment of glaucoma in Africa, and particularly in rural areas, presents many unresolved problems. Conventional conservative treatment with eye drops is difficult, due to the following reasons: -- Logistical problems of providing patients with a supply of medication. -- Appropriate use of drops requires education, together with a high degree of personal compliance. -- Cost of medical treatment. Patients require life-long treatment. Eye drops cost approximately R100,00 per person per month. Thus, over a ten-year period, the cost would be R12 000,00 per person and R576 million for the estimated 48 000 sufferers. Conventional surgery is not very effective, due to the following reasons: -- Scarring takes place at the surgical site. -- Can be performed only in main centres with microsurgical facilities and competent staff. -- Requires travelling expenses, not only for surgery, but also for periodical follow-up examinations. -- Surgical complications are not uncommon. Conventional laser surgery is not effective, for the following reasons: -- Can be performed only in main centres with laser surgery facilities and competent staff. -- Requires travelling expenses, not only for surgery, but also for periodical follow-up examinations. -- Complications of surgery are not uncommon. This dissertation describes an investigation concerning treatment of glaucoma, with specific reference to the use of optical energy sources. The spectral transmission of the human sclera is investigated. Alternative methods of sourcing optical energy to the ciliary processes are presented and compared. Results obtained can be summarized as follows: -- The spectral transmission of the sclera was measured. -- Trans-scleral transmission was measured to be very low (less than 5%). The result was confirmed by means of histological investigation, where high scleral absorption was found. -- Since no well-defined transmission window could be found, the application source need not be monochromatic. -- Results published in literature were found to be inconsistent.<br>Dissertation (MEng (Bio-engineering))--University of Pretoria, 2006.<br>Electrical, Electronic and Computer Engineering<br>unrestricted

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van, Doorn Kevin. "Investigations on the Reptilian Spectacle." Thesis, 2012. http://hdl.handle.net/10012/7148.

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The eyes of snakes and most geckos, as well as a number of other disparate squamate taxa, are shielded beneath a layer of transparent integument referred to as the “reptilian spectacle.” Derived from the embryonic fusion of palpebral tissues, the spectacle contains a number of specializations of the skin to benefit vision while still allowing it to function as the primary barrier to the environment. For example, in nearly all species that possess it, it is markedly thinned compared to the surrounding integument and its keratinized scale is optically transparent. While the spectacle may thus seem ideally adapted to vision in allowing the eyes to be always unoccluded, it does have a few drawbacks. One such drawback is its vascularity, the implications of which are still not fully understood, but are explored herein. As no recent synthesis exists of the body of knowledge on reptilian spectacles, the first chapter of this thesis consists of a review of spectacle anatomy, physiology, adaptive significance and evolution to help put into context the following chapters that present original research. The second chapter describes the dynamics of blood flow through the spectacle vasculature of colubrid snakes, demonstrating three main points: (1) that the spectacle vasculature exhibits cycles of regular dilation and constriction, (2) that the visual perception of a threat induces vasoconstriction of its vessels, and (3) that spectacle vessels remain dilated throughout the renewal phase. The implications of these points are discussed. The third chapter describes the spectral transmittance of the shed spectacle scale, the only keratinized structure in the animal kingdom to contribute to the dioptric apparatus of the eye, as well as its thickness. Spectacle scale transmittance and thickness was found to differ dramatically between snakes and geckos and found in snakes to vary between families. The adaptive significance of the observed variation is discussed. The fourth chapter describes biochemical analyses of the shed spectacle scales of snakes and geckos and compares their composition to other scales in the integument. Spectacle scales were found to differ significantly from other scales in their keratin composition, and gecko spectacle scales in particular were found to lack ß keratin, that hard corneous protein thought to be common to all reptile scales. The concluding chapter will discuss where this research has brought the state of our knowledge on the spectacle and offers thoughts on potentially useful avenues for further research.

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Arriaga, Arlindo José Claudino. "The measurement of the spectrum of atmospheric transmittance using the Kitt Peak solar telescope." 1988. http://catalog.hathitrust.org/api/volumes/oclc/19045366.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1988.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 176-178).

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Robinson, P. B. "The rest-frame ultraviolet transmittance spectra of gamma ray bursts from massive rapidly-rotating stellar progenitors." Thesis, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1464529.

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Jiang-Yanting, Li, and 李江衍廷. "Study of the transmittance variation in visible spectrum with various concentration of the laundry detergent." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/99828012472138347090.

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碩士<br>元智大學<br>光電工程學系<br>105<br>In this study, the visible spectrometer was applied to use for determining the concentration of the laundry detergent. To analyze the transmittance and absorbance at the specific wavelength, the concentration of the laundry detergent can be obtained. The results showed that the transmittance variation was inversely proportional the laundry detergent concentration at the wavelength of 664 nm and 703 nm; the absorbance variation was direct proportional the laundry detergent concentration at the wavelength of 677 nm. Furthermore, the best resolution can be obtained by monitoring transmittance at 703 nm or absorbance at 677 nm, in which the resolutions were approximated of 0.00214 % and 0.00022 %, respectively.

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Books on the topic "Spectral transmittance"

1

Deering, Donald D. BOREAS RSS-1 PARABOLA SSA surface reflectance and transmittance data. National Aeronautics and Space Administration, Goddard Space Flight Center, 2000.

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Yokota, Tatsuya. Spectral transmittance simulation for the ILAS infrared (830-1,650 cm) and visible (12,740-13,280 cm) regions. National Institute for Environmental Studies, 1991.

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Smith, William L. Analysis of cirrus optical properties with data from the NASA ER2 high-resolution interferometer sounder (HIS): Final report on NASA research grant NAG-1-1015. University of Wisconsin-Madison, 1990.

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Dahm, Donald J. Interpreting diffuse reflectance and transmittance: A theoretical introduction to absorption spectroscopy of scattering materials. NIR Publications, 2007.

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L, Eckerle Kenneth, ed. Regular spectral transmittance. U.S. Dept. of Commerce, National Bureau of Standards, 1987.

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L, Eckerle Kenneth, and National Bureau of Standards, eds. NBS measurement services: Regular spectral transmittance. National Bureau of Standards, 1987.

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The AIRS forward transmittance model. National Aeronautics and Space Administration, 1996.

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F, Eck Thomas, Banerjee Babu, and Goddard Space Flight Center, eds. BOREAS RSS-1 PARABOLA SSA surface reflectance and transmittance data. National Aeronautics and Space Administration, Goddard Space Flight Center, 2000.

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F, Eck Thomas, Banerjee Babu, and Goddard Space Flight Center, eds. BOREAS RSS-1 PARABOLA SSA surface reflectance and transmittance data. National Aeronautics and Space Administration, Goddard Space Flight Center, 2000.

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F, Eck Thomas, Banerjee Babu, and Goddard Space Flight Center, eds. BOREAS RSS-1 PARABOLA SSA surface reflectance and transmittance data. National Aeronautics and Space Administration, Goddard Space Flight Center, 2000.

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Book chapters on the topic "Spectral transmittance"

1

Weik, Martin H. "spectral transmittance." In Computer Science and Communications Dictionary. Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_17890.

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Hu, Juanxiu, Dongxian He, and Po Yang. "Study on Plant Nutrition Indicator Using Leaf Spectral Transmittance for Nitrogen Detection." In Computer and Computing Technologies in Agriculture IV. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-18369-0_60.

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Brunel, P., L. Lavanant, and G. Rochard. "Transmittance Coefficient Generation for Fast Radiative Transfer Models: Application to New Satellite Sounding Systems." In High Spectral Resolution Infrared Remote Sensing for Earth’s Weather and Climate Studies. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84599-4_29.

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Giusti, M. Monica, Ronald E. Wrolstad, and Daniel E. Smith. "CIE Color Specifications Calculated from Reflectance or Transmittance Spectra." In Food Analysis Laboratory Manual. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-44127-6_27.

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Giusti, M. Monica, Ronald E. Wrolstad, and Daniel E. Smith. "Calculation of CIE Color Specifications from Reflectance or Transmittance Spectra." In Food Analysis Laboratory Manual. Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-1463-7_21.

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"Spectral Reflectance and Transmittance of a Layer Stack." In A Practical Guide to Optical Metrology for Thin Films. Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527664344.ch3.

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Hanssen, Leonard M. "New instrumentation development at the National Institute of Standards and Technology for spectral diffuse reflectance and transmittance measurement." In Spectrophotometry, Luminescence and Colour; Science & Compliance, Papers presented at the second joint meeting of the UV Spectrometry Group of the UK and the Council for Optical Radiation Measurements of the USA,. Elsevier, 1995. http://dx.doi.org/10.1016/s0926-4345(06)80010-6.

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Kumar, Vineet, Shruti D. Vora, Foram A. Asodiya, Naveen Kumar, and Anil K. Gangwar. "Fourier Transform Infrared Spectroscopy of the Animal Tissues." In Real Perspective of Fourier Transforms and Current Developments in Superconductivity. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.94582.

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Animal tissues are extensively used as scaffolds for tissue engineering and regenerative therapies. They are typically subjected to decellularization process to obtain a cell-free extracellular matrix (ECM) scaffolds. It is important to identify chemical structure of the ECM scaffolds and Fourier transform infrared (FTIR) appears to be a technique of choice. In this chapter, FTIR spectra of native and decellularized buffalo aortae, buffalo diaphragms, goat skin, and native bovine cortical bone are presented. The transmittance peaks are that of organic collagen amide A, amide B, amide I, amide II and amide III chemical functional groups in both native and decellularized aortae, diaphragms and skin. In bone, the transmittance peaks are that of inorganic ν1, ν3 PO43−, OH− in addition to organic collagen amide A, amide B, amide I, amide II and amide III chemical functional groups. These important transmittance peaks of the tissue samples will help researchers in defining the chemical structure of these animal tissues.

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Thomas, Michael E. "Experimental Techniques." In Optical Propagation in Linear Media. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195091618.003.0010.

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This chapter presents basic experimental techniques and various apparatus for measuring the complex index of refraction and related quantities. Generally, measurements of transmittance, reflectance, and emittance are made using spectrometers or lasers. Other important techniques, which measure directly the real refractive index, n, the absorption coefficient, βabs , and the scattering coefficient, βsca, such as interferometry, ellipsometers, calorimetry, and scatterometers, are also introduced. Ultimately, experimental procedures must be taught in the laboratory. Thus, devoting only one chapter to experimental technique and five to theory is not indicative of the importance of this fundamental topic. By discussing the measurement of basic optical parameters, it is intended that the concepts developed in the first five chapters will be reinforced. All of the theoretical models developed in the previous chapters contain measurable parameters. Basic theory often helps guide the design of a good experiment. Once data is available, it can be used to check the assumptions of the theory. This interplay between experiment and theory is an essential part of definitive work. The chapter has two main parts; the first covers measurements of the real and imaginary parts of the complex index of refraction and the second covers measurements of scattering. As established in Chapter 2, the characterization of bulk absorption mechanisms on optical propagation is accomplished by the complex index of refraction. Considerable effort was expended in Chapters 3, 4, and 5 to obtain models of the complex index. Thus, at this point, we wish to find ways to experimentally measure the complex index of refraction for various media. The broad-band spectral response of a medium is commonly measured by a spectrometer. There are two main types of spectrometers, dispersive and interferometric. Generally, spectrometers make broad-band transmission, emission, and reflection measurements, and therefore indirectly measure, n̄. Interferometric measurements, are the exception. Lasers, which feature narrow-band, high-intensity, highly directional light are often used to complement and calibrate broad-band spectrometer measurements. The highest accuracy measurements of the absorption coefficient are obtainable by laser techniques, which can directly measure the components of the complex index.

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Chen, Meijie, Xingyu Chen, and Dongling Wu. "Solar Thermal Conversion of Plasmonic Nanofluids: Fundamentals and Applications." In Advances in Microfluidics and Nanofluids. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96991.

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Plasmonic nanofluids show great interests for light-matter applications due to the tunable optical properties. By tuning the nanoparticle (NP) parameters (material, shape, and size) or base fluid, plasmonic nanofluids can either absorb or transmit the specific solar spectrum and thus making nanofluids ideal candidates for various solar applications, such as: full spectrum absorption in direct solar absorption collectors, selective absorption or transmittance in solar photovoltaic/thermal (PV/T) systems, and local heating in the solar evaporation or nanobubble generation. In this chapter, we first summarized the preparation methods of plasmonic nanofluids, including the NP preparation based on the top-down and bottom-up, and the nanofluid preparation based on one-step and two-step. And then solar absorption performance of plasmonic nanofluids based on the theoretical and experimental design were discussed to broaden the absorption spectrum of plasmonic nanofluids. At last, solar thermal applications and challenges, including the applications of direct solar absorption collectors, solar PT/V systems, solar distillation, were introduced to promote the development of plasmon nanofluids.

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Conference papers on the topic "Spectral transmittance"

1

Ganesan, Krithiga, and Wojciech Lipin´ski. "Measurements of Spectral Transmittance of Porous Cerium Dioxide in the Range 900-1,700 nm." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44332.

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Overall transmittance of porous cerium dioxide is measured in the spectral range of 900–1700 nm using dispersive spectroscopy. Dense and porous samples of cerium dioxide with average porosities of 0.08 and 0.72, respectively, are investigated. The transmittance of both sample types increases with decreasing thickness, and this trend is more pronounced for the dense samples. The on-average spectrally increasing transmittance of the dense samples is attributed to the decreasing absorption by bulk cerium dioxide with radiation wavelength. The transmittance of the porous samples, on the other hand, remains a constant over the spectrum. Porous samples attenuate radiation stronger than the dense samples at any wavelength in the considered range, and it is hypothesized that this effect is due to more intense scattering. Sharp local variations of the transmittance are observed for both sample types.

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Zhu, Qunzhi, Rui Duan, and Yongguang Li. "Measurements of Solar Optical Properties of Transparent Insulation Materials." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32360.

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Transparent insulation materials have been extensively used in building windows and solar collector covers. Glass and plastic sheets are long-established insulators while aerogel is a promising material due to its high light transmittance and low thermal conductivity. Optical properties of aerogels, glass, and plastic sheets are measured with a spectrophotometer. Solar transmittance and light transmittance are calculated from the measured optical properties in accordance with the standard spectral data. Normal-direct transmittances and normal-hemispherical transmittances of different materials are compared. Specific surface area and pore size distribution of aerogels are measured with the Brunauer-Emmett-Teller method. The correlation between the optical properties and nanoscale structure features of aerogels is investigated.

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Wang, Jiaqi, Jeffery C. C. Lo, S. W. Ricky Lee, Feng Yun, and Mian Tao. "Modeling and Parametric Study of Light Scattering, Absorption and Emission of Phosphor in a White Light-Emitting Diode." In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48664.

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In this study, we proposed and demonstrated an effective approach to model and predict spectral power distribution (SPD) for a phosphor-converted light emitting diode (pc-LED). For emission and excitation, broadband diffuse transmittances of 1 mm YAG:Ce phosphor plates with different concentrations were measured by a spectrophotometer. For emission, it was found that transmittance for all wavelengths was almost identical. This result indicates that emission spectrum prediction could be simplified by simulating the radiant power of the peak wavelength only. At the peak wavelength (560 nm), our simulation results, in which optical constants were calculated by the Lorenz-Mie theory, agreed well with our measurements. For excitation, a novel transmittance measurement setup based on an LED goniophotometer was proposed to obtain the absorption coefficient. By adjusting the optical parameter in our ray-tracing model to fit measured transmittances, accurate absorption coefficients were determined. Based on our calculation and measured optical parameters, we simulated the radiant power of the blue light and yellow light of commercial white LED packages. By expanding the total blue and yellow power into linear combinations of wavelengths in both regions, we successfully predicted the SPD of our LED package. Our predicted SPD has good agreement with the measured results.

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Fong, Alexandre Y. "Spectral transmittance and reflectance measurements utilizing a DLP based spectral source." In SPIE MOEMS-MEMS, edited by Michael R. Douglass and Patrick I. Oden. SPIE, 2011. http://dx.doi.org/10.1117/12.877087.

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Yang, Steven S. L., Y. C. Chau, Aaron Y. K. Yan, and Brenda H. S. Lam. "MEASUREMENT OF REGULAR SPECTRAL TRANSMITTANCE OF OPTICAL FILTERS." In CIE 2017 Midterm Meetings and Conference on Smarter Lighting for Better Life. International Commission on Illumination, CIE, 2018. http://dx.doi.org/10.25039/x44.2017.po41.

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Lee, Bong Jae, Vinh Khuu, and Zhuomin Zhang. "Spectral Transmittance of Thin Films with Rough Surfaces." In 37th AIAA Thermophysics Conference. American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-2466.

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Wei, Heli, Xiuhong Chen, Ruizhong Rao, Yingjian Wang, and Ping Yang. "A Fast Moderate-Spectral-Resolution Atmospheric Transmittance Model." In Hyperspectral Imaging and Sounding of the Environment. OSA, 2007. http://dx.doi.org/10.1364/hise.2007.hmc3.

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Zhang, Juan, Liren Liu, Yu Zhou, and Changhe Zhou. "Design of the filter with flattening spectral transmittance." In Photonics Asia 2002, edited by Zhicheng Weng, Jose M. Sasian, and Yongtian Wang. SPIE, 2002. http://dx.doi.org/10.1117/12.471420.

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Chang, Gao-Wei, and Ming-Yu Heish. "Automatic spectral transmittance measurement system for DWDM filters." In ITCom 2003, edited by Achyut K. Dutta, Abdul Ahad S. Awwal, Niloy K. Dutta, and Kazuo Fujiura. SPIE, 2003. http://dx.doi.org/10.1117/12.511086.

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Plastun, A., A. Konyukhov, E. Romanova, et al. "Spectral dependence of all-solid photonic bandgap fiber transmittance." In 2013 International Conference on Advanced Optoelectronics and Lasers (CAOL). IEEE, 2013. http://dx.doi.org/10.1109/caol.2013.6657531.

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Reports on the topic "Spectral transmittance"

1

Eckerle, Kenneth L., Jack J. Hsia, Klaus D. Mielenz, and Victor R. Weidner. Regular spectral transmittance. National Bureau of Standards, 1987. http://dx.doi.org/10.6028/nbs.sp.250-6.

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2

Cornette, William M., Prabhat Acharya, David Robertson, and Gail P. Anderson. Moderate Spectral Atmospheric Radiance and Transmittance Code (MOSART). Volume 2: User's Reference Manual. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada304180.

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Kantrowitz, Frank T., William M. Gutman, and Troy D. Gammill. Determination of Spectrally Resolved Transmittance and Extinction Coefficients for Obscurants at Smoke Week XIV. Defense Technical Information Center, 1994. http://dx.doi.org/10.21236/ada286473.

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