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Journal articles on the topic 'Optical-based scanners'

Author: Grafiati

Published: 21 February 2023

Last updated: 31 July 2025

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1

Bohner, Lauren, Daniel Habor, Klaus Radermacher, Stefan Wolfart, and Juliana Marotti. "Scanning of a Dental Implant with a High-Frequency Ultrasound Scanner: A Pilot Study." Applied Sciences 11, no. 12 (2021): 5494. http://dx.doi.org/10.3390/app11125494.

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The purpose of this in vitro study was to assess the trueness of a dental implant scanned using an intraoral high-frequency ultrasound prototype and compared with conventional optical scanners. An acrylic resin cast containing a dental implant at position 11 was scanned with a fringe projection 3D sensor for use as a reference dataset. The same cast was scanned 10 times for each group. Ultrasound scanning was performed with a high-frequency probe (42 MHz, aperture diameter of 4 mm and focus length of 8 mm), and 3D images were reconstructed based on the depth of each surface point echo. Optical

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Vyskub, Victor. "CONTROLLING OPTICAL BEAMS USING MUTUALLY COMPLEMENTARY SCANNERS." Innovatics and Expert Examination, no. 2(30) (December 3, 2020): 125–38. http://dx.doi.org/10.35264/1996-2274-2020-2-125-138.

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Devices based on scanners (deflectors, scanning devices) with mutually complementary characteristics can be a solution to control problems of an optical scanning beam in a number of applications. The paper considers optical-mechanical, electronic, acousto-optical, electro-optical, as well as microelectromechanical (MEMS), micro-optical electromechanical (MOEMS) scanners as components of combined scanning devices. The qualitative indicators of composite scanning, including the speed, resolution, control accuracy of the optical beam, the dimensions of the scanned space, etc., are given. Along wi

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Majstorović, Nemanja, Luka Čerče, Davorin Kramar, et al. "Examination of Scanner Precision by Analysing Orthodontic Parameters." Balkan Journal of Dental Medicine 21, no. 1 (2017): 32–43. http://dx.doi.org/10.1515/bjdm-2017-0005.

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Summary Background: 3D modelling in orthodontics is becoming an increasingly widespread technique in practice. One of the significant questions already being asked is related to determining the precision of the scanner used for generating surfaces on a 3D model of the jaw. Materials and methods: This research was conducted by generating a set of identical 3D models on Atos optical 3D scanner and Lazak Scan laboratory scanner, which precision was established by measuring a set of orthodontic parameters (54 overall) in all three orthodontic planes. In this manner we explored their precision in s

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Guerra, Maria Grazia, Leonardo De Chiffre, Fulvio Lavecchia, and Luigi Maria Galantucci. "Use of Miniature Step Gauges to Assess the Performance of 3D Optical Scanners and to Evaluate the Accuracy of a Novel Additive Manufacture Process." Sensors 20, no. 3 (2020): 738. http://dx.doi.org/10.3390/s20030738.

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In this work, we show how miniature step gauges featuring unidirectional and bidirectional lengths can be used to assess the performance of 3D optical scanners as well as the accuracy of novel Additive Manufacturing (AM) processes. A miniature step gauge made of black polyphenylene sulfide (PPS) was used for the performance verification of three different optical scanners: a structured light scanner (SLS), a laser line scanner (LLS), and a photogrammetry-based scanner (PSSRT), having comparable resolutions and working volumes. Results have shown a good agreement between the involved scanners,

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Martins, Jorge N. R., Ricardo Pinto, Emmanuel J. N. L. Silva, et al. "3D Surface Scanning—A Novel Protocol to Characterize Virtual Nickel–Titanium Endodontic Instruments." Materials 16, no. 10 (2023): 3636. http://dx.doi.org/10.3390/ma16103636.

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The nickel–titanium (NiTi) instruments’ geometry plays an important role in their performance and behavior. The present assessment intends to validate and test the applicability of a 3D surface scanning method using a high-resolution laboratory-based optical scanner to create reliable virtual models of NiTi instruments. Sixteen instruments were scanned using a 12-megapixel optical 3D scanner, and methodological validation was performed by comparing quantitative and qualitative measurements of specific dimensions and identifying some geometric features of the 3D models with images obtained thro

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Borodina, Irina D., Leon S. Grigoryants, Magammed A. Gadzhiev, et al. "Comparative evaluation of the accuracy of the dental arch display using modern intraoral three-dimensional scanners." Russian Journal of Dentistry 26, no. 4 (2022): 287–97. http://dx.doi.org/10.17816/1728-2802-2022-26-4-287-297.

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BACKGROUND: At present, modern dentists used dental intraoral three-dimensional (3D) scanners routinely in their daily work. Obtaining an optical 3D image of the teeth and dentition helps avoid errors at the stage of obtaining traditional silicone impressions and significantly reduces the level of discomfort during dental procedures. Intraoral scanner systems are commercially available today. Despite their advantages over traditional silicone impressions, the accuracy of the optical impressions obtained during total and subtotal prosthetics on the upper and lower jaw are still questionable.&#x

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Duma, Virgil-Florin, and Maria-Alexandra Duma. "Optomechanical Analysis and Design of Polygon Mirror-Based Laser Scanners." Applied Sciences 12, no. 11 (2022): 5592. http://dx.doi.org/10.3390/app12115592.

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Polygon Mirror (PM)-based scanning heads are one of the fastest and most versatile optomechanical laser scanners. The aim of this work is to develop a multi-parameter opto-mechanical analysis of PMs, from which to extract rules-of-thumbs for the design of such systems. The characteristic functions and parameters of PMs scanning heads are deduced and studied, considering their constructive and functional parameters. Optical aspects related to the kinematics of emergent laser beams (and of corresponding laser spots on a scanned plane or objective lens) are investigated. The PM analysis (which im

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Komissarov, A. V., A. V. Remizov, M. M. Shlyakhova, and K. K. Yambaev. "Handheld Laser Scanner Research." Geodesy and Cartography 952, no. 10 (2019): 47–54. http://dx.doi.org/10.22389/0016-7126-2019-952-10-47-54.

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The authors consider hand-held laser scanners, as a new photogrammetric tool for obtaining three-dimensional models of objects. The principle of their work and the newest optical systems based on various sensors measuring the depth of space are described in detail. The method of simultaneous navigation and mapping (SLAM) used for combining single scans into point cloud is outlined. The formulated tasks and methods for performing studies of the DotProduct (USA) hand-held laser scanner DPI?8X based on a test site survey are presented. The accuracy requirements for determining the coordinates of

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Setiawan, Anang Wahyu, Muslimin Muslimin, and Ghany Heryana. "STUDI KINERJA HANDHELD PORTABLE 3D SCANNER DALAM PENGUKURAN DIAMETER DAN KEDALAMAN LUBANG PADA SPESIMEN LOGAM." JTT (Jurnal Teknologi Terapan) 9, no. 1 (2023): 52. http://dx.doi.org/10.31884/jtt.v9i1.420.

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A Handheld portable 3D Scanner is an optical-based tool that can be gripped by hand and moved from one place to another. This tool is used to scan part’s surface and produce a 3-dimensional representation in the form of a point cloud. The use of 3D Scanners has grown significantly in recent years, especially in applications in the metrology, industrial manufacturing inspection, and reverse engineering. Apart from the ease of use and flexibility of use, as an optical-based tool with triangulation principles, Handheld Portable 3D Scanners have limitations in scanning the geometric shape of a nar

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Mendřický, Radomír. "Precision Analysis of Optical 3D Digitisation of Shaped Elements." Applied Mechanics and Materials 693 (December 2014): 177–82. http://dx.doi.org/10.4028/www.scientific.net/amm.693.177.

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This paper presents results of a carried out research in the field of scanning precision of contactless optical 3D scanners. Results stated in this paper bring great benefits to practice, since it demonstrates the quality and limits of measuring by means of contactless optical systems in real conditions and therefore its possible use in the field of inspecting the dimensional and shape precision of industrial products.A measurement etalon of various shapes and sizes was designed and manufactured for the purpose of this analysis. The nominal dimensions of the etalon were set by measuring of the

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Simard, M., Z. Khalid, and A. G. Kirk. "Digital optical space switch based on micromotor grating scanners." IEEE Photonics Technology Letters 18, no. 2 (2006): 313–15. http://dx.doi.org/10.1109/lpt.2005.860374.

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Bräuer-Burchardt, Christian, Roland Ramm, Matthias Heinze, Peter Kühmstedt, and Gunther Notni. "Calibration Strategies for Optical Underwater 3D-Scanners." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVIII-2/W10-2025 (July 7, 2025): 33–38. https://doi.org/10.5194/isprs-archives-xlviii-2-w10-2025-33-2025.

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Abstract. The precise three-dimensional (3D) reconstruction of underwater objects is required in many different applications. Optical systems are gaining popularity due to their high accuracy potential. As a result, calibration of these systems for underwater use is becoming increasingly important. Several approaches for high quality calibration of optical 3D sensors based on stereo cameras are introduced and compared. Because of the transition of the vision rays between the media air, glass, and water, the calibration of optical underwater 3D scanners is challenging. The presented calibration

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Albayrak, Berkman, İsmail Hakkı Korkmaz, Alvin G. Wee, Cortino Sukotjo, and Funda Bayındır. "Assessing the Effect of Interimplant Distance and Angle on Different Impression Techniques." Machines 10, no. 5 (2022): 293. http://dx.doi.org/10.3390/machines10050293.

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We aimed to evaluate the trueness of digital and conventional impression techniques based on different angles and distances between implants and the deviation caused by the angle and distance parameters varying between implants. Eight implants were placed in a polyurethane edentulous mandibular model at different angles and distances. After obtaining a 3-dimensional (3D) reference model by using an optical scanner, the model was scanned with three intraoral scanners: Cerec Omnicam (DO), Trios 3 (DT), and Carestream 3500 (DC). Then, the master casts obtained from the conventional impressions (C

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Gonçalves, Ricardo Spyrides Boabaid Pimentel, and Jens Haueisen. "Three-Dimensional Immersion Scanning Technique: A Scalable Low-Cost Solution for 3D Scanning Using Water-Based Fluid." Sensors 23, no. 6 (2023): 3214. http://dx.doi.org/10.3390/s23063214.

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Three-dimensional scanning technology has been traditionally used in the medical and engineering industries, but these scanners can be expensive or limited in their capabilities. This research aimed to develop low-cost 3D scanning using rotation and immersion in a water-based fluid. This technique uses a reconstruction approach similar to CT scanners but with significantly less instrumentation and cost than traditional CT scanners or other optical scanning techniques. The setup consisted of a container filled with a mixture of water and Xanthan gum. The object to be scanned was submerged at va

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Gorecki, Christophe, and Sylwester Bargiel. "MEMS Scanning Mirrors for Optical Coherence Tomography." Photonics 8, no. 1 (2020): 6. http://dx.doi.org/10.3390/photonics8010006.

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This contribution presents an overview of advances in scanning micromirrors based on MEMS (Micro-electro-mechanical systems) technologies to achieve beam scanning for OCT (Optical Coherence Tomography). The use of MEMS scanners for miniaturized OCT probes requires appropriate optical architectures. Their design involves a suitable actuation mechanism and an adapted imaging scheme in terms of achievable scan range, scan speed, low power consumption, and acceptable size of the OCT probe. The electrostatic, electromagnetic, and electrothermal actuation techniques are discussed here as well as the

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Wang, Qiang, Weimin Wang, Xuye Zhuang, Chongxi Zhou, and Bin Fan. "Development of an Electrostatic Comb-Driven MEMS Scanning Mirror for Two-Dimensional Raster Scanning." Micromachines 12, no. 4 (2021): 378. http://dx.doi.org/10.3390/mi12040378.

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Microelectromechanical System (MEMS)-based scanning mirrors are important optical devices that have been employed in many fields as a low-cost and miniaturized solution. In recent years, the rapid development of Light Detection and Ranging (LiDAR) has led to opportunities and challenges for MEMS scanners. In this work, we propose a 2D electrostatically actuated micro raster scanner with relatively large aperture. The 2D scanner combines a resonant scanning axis driven by an in-plane comb and a quasistatic scanning axis driven by a vertical comb, which is achieved by raising the moving comb fin

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Nídlová, Veronika, and Jan Hart. "Reliability of Identification Based on Fingerprints in Dual Biometric Identification Systems." Applied Mechanics and Materials 752-753 (April 2015): 1040–44. http://dx.doi.org/10.4028/www.scientific.net/amm.752-753.1040.

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At present, the development of biometrics is a widely discussed topic. This research discusses the reliability of the most used category - identification using fingerprints. There are many of these types of systems. The most affordable, and therefore the most common alternative is one that identifies users using an optical sensor. Testing was conducted on two scanners only for fingerprints, and on two systems that recognize users via their fingerprints and also through a facial image. The conclusions from the measurements were that reliability was mainly affected by the characteristics of the

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Vlaeyen, Michiel, Han Haitjema, and Wim Dewulf. "Uncertainty-Based Autonomous Path Planning for Laser Line Scanners." Metrology 2, no. 4 (2022): 479–94. http://dx.doi.org/10.3390/metrology2040028.

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This study proposes an algorithm to autonomously generate the scan path for a laser line scanner mounted on a coordinate measuring machine. The scan path is determined based on task-specific measurement uncertainty in order to prove conformance to specified tolerances. The novelty of the algorithm is the integration of measurement uncertainty. This development is made possible by recent developments for digital twins of optical measurement systems. Furthermore, the algorithm takes all the constraints of this optical measurement system into account. The proposed algorithm is validated on differ

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Kannan, Sheela, Chalakuzhiyil Abraham Mathew, and Roseline Savarimuthu Paulraj. "INTRAORAL SCANNING SYSTEMS - A CURRENT OVERVIEW." International Journal of Advanced Research 8, no. 10 (2020): 1214–23. http://dx.doi.org/10.21474/ijar01/11956.

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Intraoral scanners (IOSs) are devices used for capturing direct optical impressions in dentistry. IOS eliminates the errors that are encountered with the conventional impression making procedures. The last decade has seen an increasing number of optical IOS devices, and these are based on different technologies. The objective of this review article is to discuss intraoral scanners with regards to its technology, generation systems, scanning paths, necessity of a powdering medium, accuracy (Trueness and precision), intermaxillary relationship registration, commercially available IOS, clinical r

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Meier, Tobias, Alexander Förste, Ali Tavassolizadeh, et al. "A scanning probe microscope for magnetoresistive cantilevers utilizing a nested scanner design for large-area scans." Beilstein Journal of Nanotechnology 6 (February 13, 2015): 451–61. http://dx.doi.org/10.3762/bjnano.6.46.

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We describe an atomic force microscope (AFM) for the characterization of self-sensing tunneling magnetoresistive (TMR) cantilevers. Furthermore, we achieve a large scan-range with a nested scanner design of two independent piezo scanners: a small high resolution scanner with a scan range of 5 × 5 × 5 μm3 is mounted on a large-area scanner with a scan range of 800 × 800 × 35 μm3. In order to characterize TMR sensors on AFM cantilevers as deflection sensors, the AFM is equipped with a laser beam deflection setup to measure the deflection of the cantilevers independently. The instrument is based

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Gruszka, Józef, Michał Wieczorowski, Barbara Śmierzchalska, Maciej Szelewski, Ireneusz Zachwiej, and Damian Śmierzchalski. "ITA Calibration Laboratory." Mechanik 91, no. 5-6 (2018): 430–33. http://dx.doi.org/10.17814/mechanik.2018.5-6.53.

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In the paper a process of implementation of management system according to PN-EN ISO/IEC 17025 for ITA Calibration Laboratory was presented. Laboratory was granted an accreditation from PCA regarding calibration of universal testing machines and technological devices for tensile forces and compression forces as well as coordinate measurement systems with optical distance sensors and coordinate measurement systems based on technique of optical scanners for rotary symetrical work pieces.

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Hofmann, S., D. Eggert, and C. Brenner. "Skyline matching based camera orientation from images and mobile mapping point clouds." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-5 (May 28, 2014): 181–88. http://dx.doi.org/10.5194/isprsannals-ii-5-181-2014.

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Mobile Mapping is widely used for collecting large amounts of geo-referenced data. An important role plays sensor fusion, in order to evaluate multiple sensors such as laser scanner and cameras jointly. This requires to determine the relative orientation between sensors. Based on data of a <i>RIEGL</i> VMX-250 mobile mapping system equipped with two laser scanners, four optional cameras, and a highly precise GNSS/IMU system, we propose an approach to improve camera orientations. A manually determined orientation is used as an initial approximation for matching a large number of poi

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Haas, Titus, Maximilian Warhanek, Michael Dietlicher, and Konrad Wegener. "Increased Productivity for Redundant Laser Scanners Using an Optimal Trajectory Separation Method." International Journal of Automation Technology 10, no. 6 (2016): 941–49. http://dx.doi.org/10.20965/ijat.2016.p0941.

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Combining an optical laser scanning system with mechanical axes in a redundant configuration and synchronised control allows the separation of scanning motions according to the strengths of the two systems. Assigning the highly dynamic movement part to the agile optical axes reduces the acceleration and jerk of the mechanical axes. The mechanical axes enable precise motion over the whole workspace, that cannot be achieved by optical systems. The determination of the ideal trajectory separation among the two redundant systems poses an optimisation problem. This study proposes a method for the c

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Ngan, Calvin C., Harry Sivasambu, Sandra Ramdial, and Jan Andrysek. "Evaluating the Reliability of a Shape Capturing Process for Transradial Residual Limb Using a Non-Contact Scanner." Sensors 22, no. 18 (2022): 6863. http://dx.doi.org/10.3390/s22186863.

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Advancements in digital imaging technologies hold the potential to transform prosthetic and orthotic practices. Non-contact optical scanners can capture the shape of the residual limb quickly, accurately, and reliably. However, their suitability in clinical practice, particularly for the transradial (below-elbow) residual limb, is unknown. This project aimed to evaluate the reliability of an optical scanner-based shape capture process for transradial residual limbs related to volumetric measurements and shape assessment in a clinical setting. A dedicated setup for digitally shape capturing tra

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Jae-Hyuk Park and J. Akedo. "Fabrication and scanning-angle temperature dependence of metal-based, optical resonant scanners with PZT actuation." IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 55, no. 5 (2008): 942–45. http://dx.doi.org/10.1109/tuffc.2008.736.

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Martínez-Pellitero, Susana, Eduardo Cuesta, Sara Giganto, and Joaquín Barreiro. "New procedure for qualification of structured light 3D scanners using an optical feature-based gauge." Optics and Lasers in Engineering 110 (November 2018): 193–206. http://dx.doi.org/10.1016/j.optlaseng.2018.06.002.

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Marcialis, Gian Luca, Pietro Coli, and Fabio Roli. "Fingerprint Liveness Detection Based on Fake Finger Characteristics." International Journal of Digital Crime and Forensics 4, no. 3 (2012): 1–19. http://dx.doi.org/10.4018/jdcf.2012070101.

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The vitality detection of fingerprints is currently acknowledged as a serious issue for personal identity verification systems. This problem, raised some years ago, is related to the fact that the 3d shape pattern of a fingerprint can be reproduced using artificial materials. An image quite similar to that of true, alive, fingerprint, is derived if such “fake fingers” are submitted to an electronic scanner. Since introducing hardware dedicated to liveness detection in scanners is expensive, software-based solutions, based on image processing algorithms, have been proposed as alternative. So fa

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Arsenault, J. L., S. Poulcur, C. Messier, and R. Guay. "WinRHlZO™, a Root-measuring System with a Unique Overlap Correction Method." HortScience 30, no. 4 (1995): 906D—906. http://dx.doi.org/10.21273/hortsci.30.4.906d.

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WinRHlZO™ is a new root measuring system (1993) based on an optical scanner instead of a video camera. Scanners produce high-quality images, free of illumination problems, over large areas (typically 11 × 17 inches). They are also extremely easy to use, and do not need to be recalibrated each time the optical set up or the resolution is changed. Different lighting systems are also available. WinRHlZO™ is an interactive system; the user can see on screen with color codes what the system is measuring and can make corrections if needed. WinRHlZO™ has the capacity to detect overlapping root parts

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Chen, Qian, Hui Zhao, Tingxiang Qi, Hua Wang, and Huikai Xie. "A Miniaturized Electrothermal-MEMS-Based Optical Coherence Tomography (OCT) Handheld Microscope." Photonics 11, no. 1 (2023): 17. http://dx.doi.org/10.3390/photonics11010017.

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Swept-source optical coherence tomography (SS-OCT), benefiting from its high sensitivity, relatively large penetration depth, and non-contact and non-invasive imaging capability, is ideal for human skin imaging. However, limited by the size and performance of the reported optical galvanometer scanners, existing portable/handheld OCT probes are still bulky, which makes continuously handheld imaging difficult. Here, we reported a miniaturized electrothermal-MEMS-based SS-OCT microscope that only weighs about 25 g and has a cylinder with a diameter of 15 mm and a length of 40 mm. This MEMS-based

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Kaur, Mandeep, Pierre M. Lane, and Carlo Menon. "Scanning and Actuation Techniques for Cantilever-Based Fiber Optic Endoscopic Scanners—A Review." Sensors 21, no. 1 (2021): 251. http://dx.doi.org/10.3390/s21010251.

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Endoscopes are used routinely in modern medicine for in-vivo imaging of luminal organs. Technical advances in the micro-electro-mechanical system (MEMS) and optical fields have enabled the further miniaturization of endoscopes, resulting in the ability to image previously inaccessible small-caliber luminal organs, enabling the early detection of lesions and other abnormalities in these tissues. The development of scanning fiber endoscopes supports the fabrication of small cantilever-based imaging devices without compromising the image resolution. The size of an endoscope is highly dependent on

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Mozgovoy, Dmitriy, Dmitriy Svinarenko, Roman Tsarev, and Tatiana Yamskikh. "Simulated satellite imagery of lengthy territories with complex configuration." E3S Web of Conferences 75 (2019): 01014. http://dx.doi.org/10.1051/e3sconf/20197501014.

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The study presents the results of creating simulated satellite imagery of lengthy territories with complex configuration using data from satellites with optical-electronic scanners of ultrahigh spatial resolution. The article attempts to clarify the feasibility of one-orbit imagery of a given lengthy object, taking into account the existing limitations on the values of pointing angles and satellite angular velocities based on the results of modeling the system of automatic satellite attitude program control during the process of imagery.

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Ehrhardt, J., T. Frenzel, D. Säring, et al. "Motion Artifact Reducing Reconstruction of 4D CT Image Data for the Analysis of Respiratory Dynamics." Methods of Information in Medicine 46, no. 03 (2007): 254–60. http://dx.doi.org/10.1160/me9040.

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Summary Objectives: Respiratory motion represents a major problem in radiotherapy of thoracic and abdominal tumors. Methods for compensation require comprehensive knowledge of underlying dynamics. Therefore, 4D (= 3D + t) CT data can be helpful. But modern CT scanners cannot scan a large region of interest simultaneously. So patients have to be scanned in segments. Commonly used approaches for reconstructing the data segments into 4D CT images cause motion artifacts. In orderto reduce the artifacts, a new method for 4D CT reconstruction is presented. The resulting data sets are used to analyze

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Nguyen, Xuan-Huy, Chao-Ming Chen, Hien-Thanh Le, and Hsiao-Yi Lee. "Enhancement of a Single-Axis Femtosecond Laser Scanning System by Using Two Galvanometers to Improve the Telecentricity and the Effective Scanning Length on Laser Process." Applied Sciences 12, no. 23 (2022): 12434. http://dx.doi.org/10.3390/app122312434.

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The galvanometer scanning system plays a crucial role in modern laser material processing. With the development of this industry, the requirements for galvanometer scanners are getting higher and higher, especially to overcome the inherent disadvantages that still exist, such as image distortion, marking speed and accuracy in state-of-the-art scanning systems. In this paper, a single-axis optical scanner using two galvanometers in combination with one f-theta telecentric lens and a 343 nm femtosecond pulse laser source is proposed as a new approach for enhancing the precision of laser micromac

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Pexman, K., and S. Robson. "EXPLORING THE LIMITS OF TERRESTRIAL LASER SCANNERS ON AEROSPACE MATERIALS." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVIII-1/W2-2023 (December 13, 2023): 749–55. http://dx.doi.org/10.5194/isprs-archives-xlviii-1-w2-2023-749-2023.

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Abstract. Terrestrial laser scanners are powerful measurement devices commonly used for 3D modelling tasks generating large volumes of data with fast acquisition as a first priority. However, these scanners can alternatively be used to produce near real-time, engineering quality spatial data concerning the changing state of manufactured components. This paper provides a comprehensive analysis of two terrestrial laser scanners capturing aerospace materials and components, and their associated quality measures. In order to explore the limitations of the tested TLS instruments, a mechanical jig w

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Liang, Ju Hua, and Jun Qian. "A Method for Printing Image Sharpening Based on the Principle of Electronic Scanners." Applied Mechanics and Materials 543-547 (March 2014): 2368–72. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.2368.

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For enhancing printing images quality so as to meet human visual needs, two ways of scanners clarity compensating by optical unsharp-mask and electronic second differential had been devoted based on investigating the cause of cut down on presswork definition produced by printing, the advantages of the twofold method which combine the two was also discussed in the thesis. The method of applying the technique was proposed in digital image processing. Tests had been done on standard images by the suggested method in Matlab, normal ways of USM and second differential were also used for comparing,

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Jiang, Ming, Xizhao Wang, Shanhao Ke, Fei Zhang, and Xiaoyan Zeng. "Large scale layering laser surface texturing system based on high speed optical scanners and gantry machine tool." Robotics and Computer-Integrated Manufacturing 48 (December 2017): 113–20. http://dx.doi.org/10.1016/j.rcim.2017.03.005.

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Landi, Luca, Silvia Logozzo, Giulia Morettini, and Maria Cristina Valigi. "Withstanding Capacity of Machine Guards: Evaluation and Validation by 3D Scanners." Applied Sciences 12, no. 4 (2022): 2098. http://dx.doi.org/10.3390/app12042098.

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Ballistic penetration of machine guards is a topic of great significance for ensuring safety and avoiding projection of objects out of the working space of machines. Although standardized tests are performed according to EU Directive 2006/42/EC, they have some limitations because they are carried out using a given penetrator that perpendicularly impacts a given surface of about 500 × 500 mm. Nevertheless, the withstanding capacity of those guards depends on a lot of different design parameters and physical quantities that have not been fully investigated. This paper is focused on the study of

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Karam, Samer, Francesco Nex, Bhanu Teja Chidura, and Norman Kerle. "Microdrone-Based Indoor Mapping with Graph SLAM." Drones 6, no. 11 (2022): 352. http://dx.doi.org/10.3390/drones6110352.

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Unmanned aerial vehicles offer a safe and fast approach to the production of three-dimensional spatial data on the surrounding space. In this article, we present a low-cost SLAM-based drone for creating exploration maps of building interiors. The focus is on emergency response mapping in inaccessible or potentially dangerous places. For this purpose, we used a quadcopter microdrone equipped with six laser rangefinders (1D scanners) and an optical sensor for mapping and positioning. The employed SLAM is designed to map indoor spaces with planar structures through graph optimization. It performs

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Gafner, Markus, Stefan M. Remund, Michalina W. Chaja, and Beat Neuenschwander. "High-rate laser processing with ultrashort laser pulses by combination of diffractive elements with synchronized galvo scanning." Advanced Optical Technologies 10, no. 4-5 (2021): 333–52. http://dx.doi.org/10.1515/aot-2021-0035.

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Abstract The combination of diffractive optical elements or spatial light modulators with fully synchronized galvo scanners offers a possibility to scale up machining processes with ultra-short pulses to several 100 W of average power with minimal thermal impact. This will be demonstrated with the high-rate applications multi-pulse drilling on the fly and material removal with special intensity distributions up to an average power of 162 W and a removal rate of 16.5 mm3/min. Based on the experimental results strategies to achieve drilling rates of several 10,000 holes/s or removal rates of mul

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Hinz, Lennart, Sebastian Metzner, Philipp Müller, et al. "Fringe Projection Profilometry in Production Metrology: A Multi-Scale Comparison in Sheet-Bulk Metal Forming." Sensors 21, no. 7 (2021): 2389. http://dx.doi.org/10.3390/s21072389.

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Fringe projection profilometry in combination with other optical measuring technologies has established itself over the last decades as an essential complement to conventional, tactile measuring devices. The non-contact, holistic reconstruction of complex geometries within fractions of a second in conjunction with the lightweight and transportable sensor design open up many fields of application in production metrology. Furthermore, triangulation-based measuring principles feature good scalability, which has led to 3D scanners for various scale ranges. Innovative and modern production processe

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Zhang, Qinghua, Cong Zhang, Yongxiang Wang, et al. "Quantitative assessments of retinal macular structure among rural-dwelling older adults in China: a population-based, cross-sectional, optical coherence tomography study." BMJ Open 14, no. 2 (2024): e079006. http://dx.doi.org/10.1136/bmjopen-2023-079006.

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ObjectivesTo quantitatively assess and compare retinal macular structures of rural-dwelling older adults in China using two different optical coherence tomography (OCT) scanners and to examine their associations with demographic, lifestyle, clinical and ocular factors.Design, setting and participantsThis population-based, cross-sectional study included 971 participants (age ≥60 years) derived from the Multimodal Interventions to Delay Dementia and Disability in Rural China study. We collected data on demographics, lifestyle factors, clinical conditions (eg, cardiovascular disease (CVD)) and oc

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Wojciechowski, Jakub, and Marcin Suszynski. "Optical scanner assisted robotic assembly." Assembly Automation 37, no. 4 (2017): 434–41. http://dx.doi.org/10.1108/aa-07-2016-068.

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Purpose This paper aims to propose the method of automatic robotic assembly of two or more parts placed without fixing instrumentation and positioning on the pallet. Design/methodology/approach Assembly tasks performed by industrial robots are usually based on a constant program, extensive tooling, fixing objects in a given place and a relatively limited sensory system. In this study, a different approach is presented. The industrial robot program is adjusted to the location of parts for assembly in the work space. This leads to a transition from a clearly defined assembly sequence realized by

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Acevedo Zamora, Marco Andres, and Balz S. Kamber. "Petrographic Microscopy with Ray Tracing and Segmentation from Multi-Angle Polarisation Whole-Slide Images." Minerals 13, no. 2 (2023): 156. http://dx.doi.org/10.3390/min13020156.

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‘Slide scanners’ are rapid optical microscopes equipped with automated and accurate x-y travel stages with virtual z-motion that cannot be rotated. In biomedical microscopic imaging, they are widely deployed to generate whole-slide images (WSI) of tissue samples in various modes of illumination. The availability of WSI has motivated the development of instrument-agnostic advanced image analysis software, helping drug development, pathology, and many other areas of research. Slide scanners are now being modified to enable polarised petrographic microscopy by simulating stage rotation with the a

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Li, Nanxi, Zhengji Xu, Yuan Dong, et al. "Large-area metasurface on CMOS-compatible fabrication platform: driving flat optics from lab to fab." Nanophotonics 9, no. 10 (2020): 3071–87. http://dx.doi.org/10.1515/nanoph-2020-0063.

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AbstractA metasurface is a layer of subwavelength-scale nanostructures that can be used to design functional devices in ultrathin form. Various metasurface-based optical devices – coined as flat optics devices – have been realized with distinction performances in research laboratories using electron beam lithography. To make such devices mass producible at low cost, metasurfaces over a large area have also been defined with lithography steppers and scanners, which are commonly used in semiconductor foundries. This work reviews the metasurface process platforms and functional devices fabricated

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McEwen, D. J., and F. Creutzberg. "Dynamics of the postnoon auroral oval." Canadian Journal of Physics 64, no. 10 (1986): 1432–36. http://dx.doi.org/10.1139/p86-253.

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The morphology of the postnoon auroral oval (1300–1500 magnetic local time) as determined by ground-based optical observations with all-sky TV's and meridian scanners at Sachs Harbour, N.W.T., and Cape Parry, N.W.T., is described. Arcs associated with the "inverted-V" type of precipitation events, frequently observed with rocket and spacecraft particle detectors during this time period, are found to be short-lived, narrow, and sometimes of very restricted east–west extent. These arcs form the main feature of the auroral oval, which appears to be delineated almost ex0clusively by 6300-Å emissio

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Kühne, Christina, Ulrich Lohbauer, Stefan Raith, and Sven Reich. "Measurement of Tooth Wear by Means of Digital Impressions: An In-Vitro Evaluation of Three Intraoral Scanning Systems." Applied Sciences 11, no. 11 (2021): 5161. http://dx.doi.org/10.3390/app11115161.

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This in-vitro study aimed to investigate whether intraoral scanners (IOS) are suitable for wear measurement compared to optical profilometry (WLP). A zirconia cast representing the teeth (24–28) was fabricated. It was digitized six times using three different intraoral scanners, Cerec Omnicam AC (OC), Trios 3 (Tr3), and True Definition (TD). The scans were conducted at baseline (t0) and at three different stages of simulated wear (t1–t3), each at one wear-facet on FDI 26 and FDI 27. WLP was used as a reference method. Within each acquisition system, the maximum wear at each facet was analyzed

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Michalak, Hubert, and Krzysztof Okarma. "Fast Binarization of Unevenly Illuminated Document Images Based on Background Estimation for Optical Character Recognition Purposes." JUCS - Journal of Universal Computer Science 25, no. (6) (2019): 627–46. https://doi.org/10.3217/jucs-025-06-0627.

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One of the key operations during the image preprocessing step in Optical Character Recognition (OCR) algorithms is image binarization. Although for uniformly illuminated images, obtained typically by atbed scanners, the use of a single global threshold may be sufficient for further recognition of individual characters, it cannot be applied directly in case of non-uniform lightened document images. Such problem may occur during capturing photos of documents in unknown lighting conditions making a proper text recognition impossible in some parts of the image. Since the application of popular ada

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Mishchuk, Yevhen, Andriy Sorochenko, and Yevhen Berezovsky. "Use of reverse engineering methods in the process of restoration of machine parts." Gіrnichі, budіvelnі, dorozhnі ta melіorativnі mashini, no. 101 (October 10, 2023): 53–59. http://dx.doi.org/10.32347/gbdmm.2023.101.0501.

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The paper considers the peculiarities of creating digital copies of objects using reverse engineering technology. The main process used in reverse engineering is the processing of digital copies of objects, which is called photogrammetry. The reverse engineering process consists of the following stages. First, a 3D scan of the product and scan data processing is performed. The received digital data (polygonal mesh) is converted into a CAD file, which can be used to change the shape and topology of the model in accordance with the project. Based on this, an analysis of the two main technologies

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Habite, Tadios, Osama Abdeljaber, and Anders Olsson. "Automatic detection of annual rings and pith location along Norway spruce timber boards using conditional adversarial networks." Wood Science and Technology 55, no. 2 (2021): 461–88. http://dx.doi.org/10.1007/s00226-021-01266-w.

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AbstractIn the woodworking industry, detection of annual rings and location of pith in relation to timber board cross sections, and how these properties vary in the longitudinal direction of boards, is relevant for many purposes such as assessment of shape stability and prediction of mechanical properties of timber. The current work aims at developing a fast, accurate and operationally simple deep learning-based algorithm for automatic detection of surface growth rings and pith location along knot-free clear wood sections of Norway spruce boards. First, individual surface growth rings that are

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Bühler, Y., M. Marty, L. Egli, et al. "Spatially continuous mapping of snow depth in high alpine catchments using digital photogrammetry." Cryosphere Discussions 8, no. 3 (2014): 3297–333. http://dx.doi.org/10.5194/tcd-8-3297-2014.

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Abstract. Information on snow depth and its spatial distribution is crucial for many applications in snow and avalanche research as well as in hydrology and ecology. Today snow depth distributions are usually estimated using point measurements performed by automated weather stations and observers in the field combined with interpolation algorithms. However, these methodologies are not able to capture the high spatial variability of the snow depth distribution present in alpine terrain. Continuous and accurate snow depth mapping has been done using laser scanning but this method can only cover

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