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Littérature scientifique sur le sujet « Optical readout »

Auteur : Grafiati

Publié le 11 janvier 2025

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Articles de revues sur le sujet "Optical readout"

Fraga, F. A. F., L. M. S. Margato, S. T. G. Fetal, M. M. F. R. Fraga, R. Ferreira Marques et A. J. P. L. Policarpo. « Optical readout of GEMs ». Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment 471, n^o 1-2 (septembre 2001) : 125–30. http://dx.doi.org/10.1016/s0168-9002(01)00972-x.

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Cheng Teng, 程腾, 张青川 Zhang Qingchuan, 高杰 Gao Jie, 毛亮 Mao Liang, 伍小平 Wu Xiaoping et 陈大鹏 Chen Dapeng. « Analysis of Optical Readout Sensitivity for Uncooled Infrared Imaging Based on Optical Readout ». Acta Optica Sinica 32, n^o 2 (2012) : 0204002. http://dx.doi.org/10.3788/aos201232.0204002.

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Gallo, G., D. L. Bonanno, D. G. Bongiovanni, F. Cappuzzello, M. Cortesi, F. Longhitano, D. Lo Presti, L. Pandola et S. Reito. « Focal plane detector optical readout ». Journal of Physics : Conference Series 1056 (juillet 2018) : 012023. http://dx.doi.org/10.1088/1742-6596/1056/1/012023.

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d’Errico, Francesco, Angela Di Fulvio, Marek Maryañski, Simone Selici et Manuela Torrigiani. « Optical readout of superheated emulsions ». Radiation Measurements 43, n^o 2-6 (février 2008) : 432–36. http://dx.doi.org/10.1016/j.radmeas.2008.02.011.

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Grogan, Catherine, Faolan Radford McGovern, Rory Staines, George Amarandei et Izabela Naydenova. « Cantilever-Based Sensor Utilizing a Diffractive Optical Element with High Sensitivity to Relative Humidity ». Sensors 21, n^o 5 (1 mars 2021) : 1673. http://dx.doi.org/10.3390/s21051673.

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High-sensitivity and simple, low-cost readout are desirable features for sensors independent of the application area. Micro-cantilever sensors use the deflection induced by the analyte presence to achieve high-sensitivity but possess complex electronic readouts. Current holographic sensors probe the analyte presence by measuring changes in their optical properties, have a simpler low-cost readout, but their sensitivity can be further improved. Here, the two working principles were combined to obtain a new hybrid sensor with enhanced sensitivity. The diffractive element, a holographically patterned thin photopolymer layer, was placed on a polymer (polydimethylsiloxane) layer forming a bi-layer macro-cantilever. The different responses of the layers to analyte presence lead to cantilever deflection. The sensitivity and detection limits were evaluated by measuring the variation in cantilever deflection and diffraction efficiency with relative humidity. It was observed that the sensitivity is tunable by controlling the spatial frequency of the photopolymer gratings and the cantilever thickness. The sensor deflection was also visible to the naked eye, making it a simple, user-friendly device. The hybrid sensor diffraction efficiency response to the target analyte had an increased sensitivity (10-fold when compared with the cantilever or holographic modes operating independently), requiring a minimum upturn in the readout complexity.

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Xie, Siwei, Zhiliang Zhu, Xi Zhang, Qiangqiang Xie, Hongsen Yu, Yibin Zhang, Jianfeng Xu et Qiyu Peng. « Optical Simulation and Experimental Assessment with Time–Walk Correction of TOF–PET Detectors with Multi-Ended Readouts ». Sensors 21, n^o 14 (8 juillet 2021) : 4681. http://dx.doi.org/10.3390/s21144681.

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As a commonly used solution, the multi-ended readout can measure the depth-of-interaction (DOI) for positron emission tomography (PET) detectors. In the present study, the effects of the multi-ended readout design were investigated using the leading-edge discriminator (LED) triggers on the timing performance of time-of-flight (TOF) PET detectors. At the very first, the photon transmission model of the four detectors, namely, single-ended readout, dual-ended readout, side dual-ended readout, and triple-ended readout, was established in Tracepro. The optical simulation revealed that the light output of the multi-ended readout was higher. Meanwhile, the readout circuit could be triggered earlier. Especially, in the triple-ended readout, the light output at 0.5 ns was observed to be nearly twice that of the single-ended readout after the first scintillating photon was generated. Subsequently, a reference detector was applied to test the multi-ended readout detectors that were constructed from a 6 × 6 × 25 mm3 LYSO crystal. Each module is composed of a crystal coupled with multiple SiPMs. Accordingly, its timing performance was improved by approximately 10% after the compensation of fourth-order polynomial fitting. Finally, the compensated full-width-at-half-maximum (FWHM) coincidence timing resolutions (CTR) of the dual-ended readout, side dual-ended readout, and triple-ended readout were 216.9 ps, 231.0 ps, and 203.6 ps, respectively.

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Zhou, Weidong, et Lilong Cai. « Optical readout for optical storage with phase jump ». Applied Optics 38, n^o 23 (10 août 1999) : 5058. http://dx.doi.org/10.1364/ao.38.005058.

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Wuchrer, Roland, Sabrina Amrehn, Luhao Liu, Thorsten Wagner et Thomas Härtling. « A compact readout platform for spectral-optical sensors ». Journal of Sensors and Sensor Systems 5, n^o 1 (10 mai 2016) : 157–63. http://dx.doi.org/10.5194/jsss-5-157-2016.

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Abstract. The continuous monitoring of industrial and environmental processes is becoming an increasingly important aspect with both economic and societal impact. So far, spectral-optical sensors with their outstanding properties in terms of sensitivity and reliability have not been considered as a potential solution because of the cost-intensive and bulky readout hardware. Here we present a card-size, inexpensive, and robust readout platform based on a wavelength-sensitive photodiode. In test and characterization experiments we achieved a wavelength shift resolution of better than 0.1 nm and a detection limit of 0.001 AU for ratiometric measurements. We furthermore discuss the capability and current limitations of our readout unit in context with interrogation experiments we performed with a photonic crystal-based fluid sensor. In sum we expect the presented readout platform to foster the exploitation of spectral-optical sensor technology for gas monitoring, chemical analytics, biosensing and many others fields.

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Deisting, A. « Commissioning of a hybrid readout TPC test set-up and gas gain simulations ». Journal of Physics : Conference Series 2374, n^o 1 (1 novembre 2022) : 012145. http://dx.doi.org/10.1088/1742-6596/2374/1/012145.

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A hybrid readout Time Projection Chamber (TPC) has a simultaneous optical- and charge readout. The optical readout provides 2D images of particle tracks in the active volume, whilst the charge readout provides additional information on the particle position perpendicular to the image plane. A hybrid readout TPC working at high pressure is an attractive device for physics cases where an excellent space point resolution and a high target density is required as e.g. measuring a neutrino beam at the source of a long baseline neutrino oscillation experiment. In this paper we present two different lines of work towards the goal of developing hybrid TPC technology: a) Commissioning of a set-up with gas electron multipliers employing optical and charge readout. b) An analytical parametrisation of the gas gain for a multi wire proportional chamber based on GARFIELD++ simulations, which – when validated with measurements – allows to skip these simulations in the future altogether.

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Kranz, Michael, Tracy Hudson, Brian Grantham et Michael Whitley. « Optical Cavity Interrogation for MEMS Accelerometers ». Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, DPC (1 janvier 2015) : 001649–70. http://dx.doi.org/10.4071/2015dpc-wp34.

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MEMS accelerometers utilizing electrostatic, piezoelectric, and magnetic proof mass displacement readout approaches have achieved success in both commercial- and defense-related applications. However, there is a desire for improved acceleration resolution suitable for navigation-grade applications. Optical readout of mechanical displacements has demonstrated high levels of resolution in macro-scale applications including precision movement and placement systems. In addition, optical techniques are common in high performance inertial sensors such as fiber optic gyros and ring laser gyros. Incorporating optical readout approaches into MEMS acceleration devices may yield sufficient resolution to achieve navigation-grade performance. Therefore, the U.S. Army AMRDEC is developing MEMS accelerometers based on optical cavity resonance readout. In the device, an optical cavity is formed between a MEMS proof mass and a reference reflector. A tunable laser excites the cavity on the edge of its resonance peak. Small displacements of the cavity from its rest position are detected by frequency shifts of the resonance, leading to high-resolution proof mass displacement detection and therefore high acceleration resolutions. This paper will present modeling associated with the design concept, as well predictions of device geometries and performance with the goal of achieving less than 1 micro-g bias instability and a velocity random walk of better than 0.2 micro-g/rt.Hz.

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Thèses sur le sujet "Optical readout"

Rahman, Rizvi. « Fullerene based systems for optical spin readout ». Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:e604f0ed-7d3c-44a6-9d97-7c03e7a90580.

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Optical spin readout (OSR) in fullerene-based systems has the potential to solve the spin readout and scalability challenges in solid-state quantum information processing. While the rich variety of chemical groups that can be linked (covalently or not) to the fullerenes opens the possibility of making large and controlled arrays of qubits, optical methods can be used to measure EPR down to a single spin thanks to the large energy of optical photons compared to the microwave ones. After reviewing the state of the art of OSR, for which the diamond NV cen- ters constitute the benchmark, we undertake the study of fullerene-based species for OSR. An optically detected magnetic resonance (ODMR) setup was imple- mented in a commercial EPR spectrometer for this purpose. Each experimental chapter focuses on one of the molecular systems in question: a functionalised C₆₀ fullerene with a phosphonate group (C₆₀-phosphine), porphyrin-fullerene ar- chitectures (weakly, strongly and moderately coupled) and finally erbium-doped trimetallic nitride template (TNT) fullerenes (focusing on ErSc₂N@C₈₀). In the C₆₀-phosphine system, coherent optically detected magnetic resonance (ODMR) in the triplet state has been achieved. Since a large variety of organic and organometallic molecules can be attached to it both via the fullerene cage and the phosponate group, this result makes it a very useful template to study OSR molecules chemically linked to a qubit. In the porphyrin based structures, an intermediate coupling case in the form of a trimer-fullerene host-guest complex is found to allow detection of both the porphyrin and fullerene triplet sates by CW ODMR, which makes organo-metallic complexes a possible coupling route for a qubit to an OSR component. In the TNT fullerene, crystal field mixing makes the Er³⁺ inaccessible by ODMR. However, optical photons cause a mechanical rearrangement of the en- dohedral cluster which in turns impacts on the observed EPR. In particular, the dynamics of this process have been studied for the first time and hint to- wards diffusion kinetics at low pump power. An orientational selectivity has been discovered by using a polarised pump, and the time dynamics indicate the rearrangement of the matrix via difusion on a free volume around the fullerenes. This shows that the endohedral Er³⁺ in ErSc₂N@C₈₀ can probe the environment outside the cage.

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Montagner, Elison. « Optical readout system for bi-material terahertz sensors ». Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5478.

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The objective of this work is to design, assemble, and characterize an optical readout for bi-material MEMs sensor arrays that can be integrated into a THz imaging system. All this effort is a contribution to the goals of the research conducted by the Naval Postgraduate School Sensor Research Laboratory on designing and fabricating THz-optimized bi-material MEMs sensor arrays for THz imaging. Basic concepts of THz radiation and detection are presented. Several aspects of THz imaging, and sensor's array readout possibilities, are discussed in terms of the principle of operation for this type of sensor. An experimental optical readout was assembled during this research, and its configuration is shown, as well as all of its component details. The experimental setup was characterized following a method described in this work, and the obtained results are analyzed. Finally, one possibility of optical readout integration with a THz imaging system is suggested.

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Buseck, David Allan 1963. « High-density CD-ROM readout using direct phase measurement ». Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276545.

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Direct measurement of optical phase is used in a high-density optical disk reader. The increased density is achieved by introducing multiple pit depths to replace the single pit depths of a traditional compact disk. Having four independent pit depths can double the storage capacity of a disk. The multi-level pits are read by direct measurement of the phase difference between two laser spots focused onto the disk surface. Extraction of phase information utilizes the equations of phase shifting interferometry with four shifted fringe patterns created simultaneously by a compact optical head. The system speed is therefore limited by the readout electronics instead of by slow mechanical phase shifters. The resulting system can identify four independent levels as well as the direction of transition from one level to another. The system also has low sensitivity to vibrations and to changes in the fringe contrast and beam intensity.

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Lee, Wook. « Diffraction-based integrated optical readout for micromachined optomechanical sensors ». Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-09292006-115918/.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2006.
F. Levent Degertekin, Committee Chair ; David S. Citrin, Committee Member ; Paul E. Hasler, Committee Member ; Peter J. Hesketh, Committee Member ; Zhiping Zhou, Committee Member.

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Schuldt, Thilo. « An optical readout for the LISA gravitational reference sensor ». Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2010. http://dx.doi.org/10.18452/16241.

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Der weltraumgestützte Gravitationswellendetektor LISA (Laser Interferometer Space Antenna) besteht aus drei identischen Satelliten an Bord derer sich jeweils zwei frei schwebende Testmassen befinden. Die Lage der einzelnen Testmassen in Bezug auf die zugehörige optische Bank muss mit einer Genauigkeit besser 1 pm/sqrt(Hz) in der Abstands- und besser 10 nrad/sqrt(Hz) in der Winkelmessung erfolgen. In der vorliegenden Arbeit wird ein kompaktes optisches Auslesesystem präsentiert, welches als Prototyp für diese Abstands- und Winkelmetrologie dient. Das dafür entwickelte polarisierende Heterodyn-Interferometer mit räumlich getrennten Frequenzen basiert auf einem hoch-symmetrischen Design, bei dem zur optimalen Gleichtakt-Unterdrückung Mess- und Referenzarm die gleiche Polarisation und Frequenz sowie annähernd gleiche optische Pfade haben. Für die Winkelmessung wird die Methode der differentiellen Wellenfrontmessung eingesetzt. In einem ersten Prototyp-Aufbau wird ein Rauschniveau von weniger als 100 pm/sqrt(Hz) in der Translations- und von weniger als 100 nrad/sqrt(Hz) in der Winkelmessung (beides für Frequenzen oberhalb 0.1 Hz) demonstriert. In einem zweiten Prototyp-Aufbau werden zusätzlich eine Intensitätsstabilisierung und ein Phasenlock der beiden Frequenzen implementiert. Die analoge Phasenmessung ist durch eine digitale, FPGA basierte, ersetzt. Mit diesem Aufbau wird ein Rauschen kleiner 5 pm/sqrt(Hz) in der Translationsmessung und kleiner 10 nrad/sqrt(Hz) in der Winkelmessung, beides für Frequenzen größer 0.01 Hz, erreicht. Eine Rausch-Analyse wurde durchgeführt und die Nichtlinearitäten des Interferometers bestimmt. Das Interferometer wurde im Hinblick auf die LISA Mission entwickelt, findet seine Anwendung aber auch bei der Charakterisierung der dimensionalen Stabilität von ultra-stabilen Materialien sowie in der optischen Profilometrie. Die Adaptierung des Interferometers dazu sowie erste Resultate zu beiden Anwendungen werden in dieser Arbeit präsentiert.
The space-based gravitational wave detector LISA (Laser Interferometer Space Antenna) consists of three identical satellites. Each satellite accommodates two free-flying proof masses whose distance and tilt with respect to its corresponding optical bench must be measured with at least 1 pm/sqrt(Hz) sensitivity in translation and at least 10 nrad/sqrt(Hz) sensitivity in tilt measurement. In this thesis, a compact optical readout system is presented, which serves as a prototype for the LISA proof mass attitude metrology. We developed a polarizing heterodyne interferometer with spatially separated frequencies. For optimum common mode rejection, it is based on a highly symmetric design, where measurement and reference beam have the same frequency and polarization, and similar optical pathlengths. The method of differential wavefront sensing (DWS) is utilized for the tilt measurement. In a first prototype setup noise levels below 100 pm/sqrt(Hz) in translation and below 100 nrad/sqrt(Hz) in tilt measurement (both for frequencies above 0.1 Hz) are achieved. A second prototype was developed with additional intensity stabilization and phaselock of the two heterodyne frequencies. The analog phase measurement is replaced by a digital one, based on a Field Programmable Gate Array (FPGA). With this setup, noise levels below 5 pm/sqrt(Hz) in translation measurement and below 10 nrad/sqrt(Hz) in tilt measurement, both for frequencies above 0.01Hz, are demonstrated. A noise analysis was carried out and the nonlinearities of the interferometer were measured. The interferometer was developed for the LISA mission, but it also finds its application in characterizing the dimensional stability of ultra-stable materials such as carbon-fiber reinforced plastic (CFRP) and in optical profilometry. The adaptation of the interferometer and first results in both applications are presented in this work.

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Tripp, Everett. « Interferometric Optical Readout System for a MEMS Infrared Imaging Detector ». Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-theses/222.

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MEMS technology has led to the development of new uncooled infrared imaging detectors. One type of these MEMS detectors consist of arrays of bi-metallic photomechanical pixels that tilt as a function of temperature associated with infrared radiation from the scene. The main advantage of these detectors is the optical readout system that measures the tilt of the beams based on the intensity of the reflected light. This removes the need for electronic readout at each of the sensing elements and reduces the fabrication cost and complexity of sensor design, as well as eliminates the electronic noise at the detector. The optical readout accuracy is sensitive to the uniformity of individual pixels on the array. The hypothesis of the present research is that direct measurements of the height change corresponding to tilt through holographic interferometry will reduce the need for high pixel uniformity. Measurements of displacements for a vacuum packaged detector with nominal responsivity of 2.4nm/K are made with a Linnik interferometer employing the four phase step technique. The interferometer can measure real-time, full-field height variations across the array. In double-exposure mode, the current height map is subtracted from a reference image so that the change in deflection is measured. A software algorithm locates each mirror on the array, extracts the measured deflection at the tip of a mirror, and uses that measurement to form a pixel of a thermogram in real-time. A blackbody target projector with temperature controllable to 0.001K is used to test the thermal resolution of the imaging system. The achieved minimum temperature resolution is better than 0.25K. The double exposure technique removes mirror non-uniformity as a source of noise. A lower than nominal measured responsivity of around 1.5nm/K combined with noise from the measurements made with the interferometric optical readout system limit the potential minimum temperature resolution. Improvements need to be made both in the holographic setup and in the MEMS detector to achieve the target temperature resolution of 0.10K.

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Cools, Antoine. « Beta and neutron imaging with an optical readout Micromegas detector ». Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP090.

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Les détecteurs gazeux ont démontré, au cours de ces dernières décennies, leur haute performance pour l'imagerie de particules radioactives, atteignant des résolutions spatiales inférieures à 100 µm. Les propriétés scintillantes de certains mélanges gazeux, combinées au gain important des détecteurs gazeux et à l'usage d'une caméra à bas bruit électronique, ont permis d'utiliser la lumière scintillée pour l'imagerie. Cette approche permet d'obtenir une large surface de détection et une haute résolution spatiale tout en réalisant l'imagerie en temps réel à un coût par pixel réduit, avec une faible complexité d'analyse des données. Les principaux objectifs de cette thèse sont d'optimiser la résolution spatiale ainsi que la sensibilité du détecteur, soit par une méthode d'acquisition "événement par événement" avec des temps d'acquisition d'image courts, soit par "intégration" avec des temps d'acquisition longs.Un détecteur Micromegas en verre innovant pour la lecture optique a été développé, tirant parti de la haute résolution spatiale inhérente au détecteur Micromegas.L'adaptabilité du gain du détecteur Micromegas liée au mécanisme d'amplification par avalanche, lui permet de couvrir une large gamme de flux et d'énergies de particules. Durant cette thèse, des mesures d'imagerie ont été réalisées à l'aide de sources avec des niveaux de radioactivité inférieurs à un Becquerel et des énergies de quelques keV, jusqu'à des flux caractéristiques d'un synchrotron et d'une source de spallation, avec des énergies dépassant le MeV.Le rendement lumineux du détecteur a été étudié pour différents mélanges gazeux et pour diverses valeurs de gain sous irradiation aux rayons-X afin d'optimiser la sensibilité du détecteur. L'homogénéité et la précision de la réponse du détecteur ont été caractérisées par radiographie à rayons-X. La Fonction d'Étalement du Point (PSF) du Micromegas à lecture optique a été mesurée à l'aide d'un faisceau de rayons-X parallèles de quelques microns d'épaisseur, générés par le rayonnement synchrotron. Cette mesure a permis de déterminer la résolution spatiale du détecteur pour différentes configurations et d'identifier et de quantifier les effets qui rentrent en jeux. L'impact de la microgrille et des piliers sur la réponse en scintillation du détecteur a également été observé et quantifié.Deux applications ont été choisies afin d'illustrer le potentiel du Micromegas à lecture optique: l'autoradiographie pour la quantification d'échantillons tritiés de très faible activitié et la radiographie neutronique à haute résolution en environnement hautement radioactif.L'autoradiographie et le comptage radioactif de rayonnements beta faiblement énergétiques ont été réalisés avec des échantillons de glucose tritié. Des activités inférieures à un Becquerel ont été mesurées avec précision et simultanément sur un grand nombre d'échantillons tout en assurant une reconstruction précise de leur position. Ce travail valide la possibilité de quantifier la concentration de médicaments anticancéreux à l'échelle de cellules tumorales uniques.Enfin, l'utilisation du Micromegas à lecture optique pour la neutronographie a été démontrée en utilisant une source de spallation produisant des neutrons thermiques à un flux d'environ 10⁸ n. s⁻¹cm⁻ ² mA⁻¹. L'uniformité de la réponse du détecteur a été étudiée, et les effets de la diffusion et du parcours moyen des particules dans le gaz sur la netteté de l'image ont été mesurés et comparés à une simulation. Une résolution spatiale de l'ordre de 400 µm a été obtenue en utilisant une amplification à double étages au sein du détecteur Micromegas
Gaseous detectors have demonstrated, over the past decades, their high performance for imaging radioactive particles, achieving spatial resolutions below 100 µm. The scintillating properties of certain gas mixtures, combined with the significant gain of gaseous detectors and the use of a low-noise camera, have enabled the use of scintillation light for imaging. This approach allows for a large detection surface and high spatial resolution while achieving real-time imaging at a low cost per pixel, with low data analysis complexity. The main objectives of this thesis are to optimize the spatial resolution and sensitivity of the detector, either by an "event-by-event" acquisition method with short image acquisition times or by "integration" with long acquisition times.An innovative glass Micromegas detector for optical readout has been developed, taking advantage of the inherently high spatial resolution of the Micromegas detector. The adaptability of the Micromegas detector's gain, due to the avalanche amplification mechanism, allows it to cover a wide range of particle fluxes and energies. During this thesis, imaging measurements were performed using sources with radioactivity levels below one Becquerel and energies of a few keV, up to fluxes characteristic of a synchrotron and a spallation source, with energies exceeding one MeV.The light yield of the detector was studied for different gas mixtures and various gain values under X-ray irradiation to optimize the detector's sensitivity. The homogeneity and precision of the detector's response were characterized by X-ray radiography. The Point Spread Function (PSF) of the optical readout Micromegas was measured using a parallel X-ray beam a few microns thick, generated by synchrotron radiation. This measurement allowed us to determine the detector's spatial resolution for different configurations and to identify and quantify the effects involved. The impact of the micro-mesh and pillars on the detector's scintillation response was also observed and quantified.Two applications were chosen to illustrate the potential of the optical readout Micromegas: autoradiography, for the quantification of very low-activity tritiated samples and high-resolution neutron radiography in highly radioactive environments.Autoradiography and radioactive counting of low-energy beta radiation were performed with tritiated glucose samples. Activities below one Becquerel were measured accurately and simultaneously on a large number of samples, while ensuring precise reconstruction of their position. This work validates the possibility of quantifying the concentration of anticancer drugs at the scale of single tumor cells.Finally, the use of the optical readout Micromegas for neutron imaging was demonstrated using a spallation source which produces thermal neutrons with a flux of approximately 10⁸ n. s⁻¹cm⁻ ² mA⁻¹. The uniformity of the detector's response was studied, and the effects of the diffusion and the mean free path of particles in the gas on image sharpness were measured and compared to a simulation. A spatial resolution on the order of 400 µm was achieved using double-stage amplification within the Micromegas detector

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Gunnarsson, Gunnar Hans 1962. « A NEW READOUT TECHNIQUE FOR CD-ROM MULTILEVEL OPTICAL DATA STORAGE ». Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276464.

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A technique is presented that utilizes an on-axis intensity measurement to detect the reflected light from a multiple CD-ROM surface. The thesis includes a computer simulation of the detected signal for scans of various structures and discusses finite size detector effects. A suitably sized detector passes 77% of the total light flux at the detector plane without affecting the depth discrimination property of the technique. Experimentally, a breadboard Height Readout System (HRS) could detect height differences on test relief structures. A signal to noise ratio was obtained that corresponds to a noise equivalent height sensitivity of 30 Angstroms. Therefore, the HRS could discriminate between five levels on the test structure. An addition to the new technique uses a phase plate to determine if the focused beam is going into or out of a pit. Thus, the storage capability per unit area on the disk surface can be increased.

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Bekker, Scott Henry. « Continuous real-time recovery of optical spectral features distorted by fast-chirped readout ». Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2006/bekker/BekkerS0506.pdf.

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Toh, Edwin. « Implementation of an optical readout system for high-sensitivity terahertz microelectromechanical sensor array ». Thesis, Monterey, California : Naval Postgraduate School, 2014. http://hdl.handle.net/10945/44019.

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Approved for public release; distribution is unlimited
In this thesis, an optical readout scheme was successfully developed based on the Fourier 4F optical configuration and integrated with a custom-fabricated microelectromechanical system (MEMS)-based, terahertz (THz), detector array. The MEMS THz detector array and 4F Fourier optics were able to transduce the THz scene into an optical signal that was captured by a commercial charged coupled device (CCD) camera for generating images. A quantum cascade laser (QCL) provided the THz illumination for generating images while post-image processing performed background subtraction in order to obtain the THz scene. The Fourier 4F optical readout system that was implemented was able to profile the general shape of the QCL beam pattern and displayed good linearity of response of about 23 gray level values per Kelvin. The concept of optical readout from a micromechanical sensor array was also validated.

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Livres sur le sujet "Optical readout"

Webster, Kenneth Andrew. Investigation of the use of optical modulators for analogue data readout from particle physics detectors. Birmingham : University of Birmingham, 1995.

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Facility, Dryden Flight Research, dir. Spectral contents readout of birefringent sensor. Edwards, Calif : National Aeronautics and Space Administration, Ames Research Center, Dryden Flight Research Facility, 1990.

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Glazov, M. M. Interaction of Spins with Light. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198807308.003.0006.

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This chapter presents the details of the optical manipulation of electron spin states. It also addresses manifestations of the electron and nuclear spin dynamics in optical response of semiconductor nanostructures via spin-Faraday and -Kerr effects. Coupling of spins with light provides the most efficient method of nonmagnetic spin manipulation. The main aim of this chapter is to provide the theoretical grounds for optical spin injection, ultrafast spin control, and readout of spin states by means of circularly and linearly polarized light pulses. The Faraday and Kerr effects induced by the electron and nuclear spin polarization are analyzed both by means of a macroscopic, semi-phenomenological approach and by using the microscopic quantum mechanical model. Theoretical analysis is supported by experimental data.

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Chapitres de livres sur le sujet "Optical readout"

Tokuda, Takashi, et Jun Ohta. « DNA Optical Readout Methods ». Dans Handbook of Biochips, 1–12. New York, NY : Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-6623-9_10-1.

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Tokuda, Takashi, et Jun Ohta. « DNA Optical Readout Methods ». Dans Handbook of Biochips, 589–600. New York, NY : Springer New York, 2022. http://dx.doi.org/10.1007/978-1-4614-3447-4_10.

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Schmidt, Ricardo E. « On the Optimization of CCD Readout Noise ». Dans Optical Detectors for Astronomy, 245–50. Dordrecht : Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5262-4_38.

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Teubert, Jörg, Sumit Paul, Andreas Helwig, Gerhard Müller et Martin Eickhoff. « Group III-Nitride Chemical Nanosensors with Optical Readout ». Dans Springer Series on Chemical Sensors and Biosensors, 311–38. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/5346_2014_58.

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Wasley, Nicholas Andrew. « Direct In-plane Readout of QD Spin ». Dans Nano-photonics in III-V Semiconductors for Integrated Quantum Optical Circuits, 69–84. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01514-9_5.

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Smith, Roger M. « Readout Speed Optimization for Conventional CCDs Employing Dual Slope Integration for Double Correlated Sampling ». Dans Optical Detectors for Astronomy, 165–84. Dordrecht : Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5262-4_27.

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Chakrabarti, Supriya, Oswald H. W. Siegmund et Charles Hailey. « Development of Visible Light Sensitive Imaging Tubes with Microchannel Plate Intensifiers and Wedge and Strip Readout ». Dans Instrumentation for Ground-Based Optical Astronomy, 574–81. New York, NY : Springer New York, 1988. http://dx.doi.org/10.1007/978-1-4612-3880-5_56.

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Jian, Jiqi, Cheng Ma et Huibo Jia. « Improved-FCM-Based Readout Segmentation and PRML Detection for Photochromic Optical Disks ». Dans Fuzzy Systems and Knowledge Discovery, 514–22. Berlin, Heidelberg : Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11539506_65.

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Zanetto, Francesco. « Low-Noise Mixed-Signal Electronics for Closed-Loop Control of Complex Photonic Circuits ». Dans Special Topics in Information Technology, 55–64. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-85918-3_5.

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AbstractAn increasing research effort is being carried out to profit from the advantages of photonics not only in long-range telecommunications but also at short distances, to implement board-to-board or chip-to-chip interconnections. In this context, Silicon Photonics emerged as a promising technology, allowing to integrate optical devices in a small silicon chip. However, the integration density made possible by Silicon Photonics revealed the difficulty of operating complex optical architectures in an open-loop way, due to their high sensitivity to fabrication parameters and temperature variations. In this chapter, a low-noise mixed-signal electronic platform implementing feedback control of complex optical architectures is presented. The system exploits the ContactLess Integrated Photonic Probe, a non-invasive detector that senses light in silicon waveguides by measuring their electrical conductance. The CLIPP readout resolution has been maximized thanks to the design of a low-noise multichannel ASIC, achieving an accuracy better than −35 dBm in light monitoring. The feedback loop to stabilize the behaviour of photonic circuits is then closed in the digital domain by a custom mixed-signal electronic platform. Experimental demonstrations of optical communications at high data-rate confirm the effectiveness of the proposed approach.

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Ujiie, Norihiko, Hirokazu Ikeda et Yoshinobu Unno. « A New Concept of Multiplexed Optical Transmission Readout Scheme for a Silicon Strip Detector ». Dans Supercollider 4, 583–90. Boston, MA : Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3454-9_72.

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Actes de conférences sur le sujet "Optical readout"

Loo, Jacky, Roman Calpe, Xuan-Hung Pham, Minh-Kha Nguyen, Yike Huang, Susanna Hällsten, Kalle Oskari Mikkola et al. « Colorimetric Sensing with Reconfigurable Chiral Plasmonic Metamolecules ». Dans Optical Sensors, SM1H.5. Washington, D.C. : Optica Publishing Group, 2024. https://doi.org/10.1364/sensors.2024.sm1h.5.

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Chiral Plasmonic Metamolecules with pronounced optical activities enable colorimetric readout of chiroptical responses. We developed the reconfigurable metamolecules that has a high dis-symmetry factor as nanoswitches for molecular biosensing, where addition of target analytes brought a drastic color change readily detected with the naked eye.

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Campbell, David K., et David K. Towner. « A Magneto-optic Polarization Readout Model ». Dans Optical Data Storage. Washington, D.C. : Optica Publishing Group, 1985. http://dx.doi.org/10.1364/ods.1985.tubb2.

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Information stored on magneto-optic disks is typically read using a linearly polarized laser beam whose state of polarization is altered by the Faraday and/or polar Kerr effects upon reflection from the recording medium. Polarization sensitive optics are used to convert these media induced polarization changes into irradiance variations at photodetectors. Because the magneto-optic polarization effects are small (typically less than one degree of polarization rotation in the reflected beam) it is essential that the optical system introduce little additional polarization change if the recorded signal is to be recovered faithfully. This paper describes a polarization model that is used to predict the effects that real optical elements will have on the readout signals, noise, and ultimately, the signal to noise ratio of a magneto-optic recording system.

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Psaltis, Demetri, Alan A. Yamamura, Mark A. Neifeld et Seiji Kobayashi. « Parallel Readout of Optical Disks ». Dans Optical Computing. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/optcomp.1989.me3.

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Optical memory disks have been developed in recent years as mass storage media for audio, video, and computer memory applications. Write-once systems are already widely used, and reprogrammable systems are now starting to become commercially available as well. In all the existing systems the information stored in the optical disk is recorded and readout serially by focusing a laser beam on a single pixel. With an optical memory however it is possible to illuminate the disk with an extended beam and readout (as well as record in principle) large amounts of data in parallel [1]. This distinction between serial and Parallel Readout Optical Disks (PROD) is schematically shown in Fig.1. If the potential of PRODs is realized in practice it can eliminate the bottleneck that currently exists between mass memory and the information processing portion of a computer and thus greatly impact the speed with which computers can execute memory intensive problems. There are three main issues that we will address in this paper: The suitability of commercially available disks for this applications including the experimental characterization of a prototype magnetooptic system from SONY, the limitations imposed on parallel access due to the optical system, and the types of problems and computer architectures that can make effective use of the PROD capability.

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Tanabe, Takaya, Norio Amano et Ryoichi Arai. « Super-Resolving Readout System using Optical Apodization and Electrical Equalization ». Dans Optical Data Storage. Washington, D.C. : Optica Publishing Group, 1994. http://dx.doi.org/10.1364/ods.1994.wc4.

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Super-resolving readout systems using an apodizer are effective for achieving high-density optical recording.1,2,3 These systems need additional optics that include a narrow slit and focusing lens for suppressing enlarged sidelobes. However, the added optics reduce the readout signal power and require precise positioning of the slit. In this study, we demonstrate a super- resolving readout system that employs an electrical equalizer instead of additional optics.

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Iwanaga, Toshiaki, Satoshi Sugaya, Hiroshi Inada et Tadashi Nomura. « Magneto-optical Recording Readout Performance Evaluation ». Dans Optical Data Storage. Washington, D.C. : Optica Publishing Group, 1987. http://dx.doi.org/10.1364/ods.1987.wa2.

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Important factors in read and write processes for magnetooptical disk are that readout carrier to noise ratio (C/N) is high, readout signal envelope is smooth,optical efficiency is high, head size is compact and head weight is light. This paper summarizes results from many studies on optical retardation influence in magneto-optical head and disk substrate. Improvements in a magneto-optical head and disk drive system are presented.

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Lee, Tuzo-Chang, Wai W. Wang, Kerry Rhea et Jim Lauffenburger. « Thermal interference in high density magneto-optical recording and a method of compensation ». Dans Optical Data Storage. Washington, D.C. : Optica Publishing Group, 1994. http://dx.doi.org/10.1364/ods.1994.tud9.

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In order to achieve high density recording in a magneto-optical disk, much attention has been paid to reduce thermal interference between the recording pulses1,2. This is because thermal interference causes the variation of the recorded domain size and shape2. The domain size and shape fluctuation introduces peak shift and amplitude variation of the optical readout. This effect is significant3 when the separation between the data bits is small in a high density recording medium. For a disk drive using domain-edge recording, the peak shift introduces timing jitter relative to the timing clock pulse. In a sampled servo disk drive, the amplitude variation results in deterioration of the margin of the amplitude threshold detection4. The timing jitter in edge-recording disk drive and erosion of amplitude threshold detection margin in a sampled servo disk drive both result in carrier-to-noise ratio reduction and thus larger bit error rate of the system. In this paper, a sampled servo drive is used to study the readout amplitude variation due to thermal interference in successive recording pulses. A simple compensation technique is demonstrated to achieve uniform optical readouts of the recording data bits in successive recording pulses.

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Fujita, T., M. Kondo, K. Kime, N. Tomikawa et N. Takeshita. « Optical Head for Magneto-optical Disk Evaluation ». Dans Optical Data Storage. Washington, D.C. : Optica Publishing Group, 1985. http://dx.doi.org/10.1364/ods.1985.thaa2.

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In this paper we report an optical head developed for measuring characteristics of magneto-optical disks. The features of this head are followings:- (1) Collimating system without anamorphic elements. (2) Small phase retardation in signal-readout optical system. (3) Differential readout method using two photodetectors.

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Andrews, Jeffrey P., et Joseph A. McClintock. « Interferometric optical sensor readout system ». Dans 1993 North American Conference on Smart Structures and Materials, sous la direction de Richard O. Claus. SPIE, 1993. http://dx.doi.org/10.1117/12.147975.

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Castera, J. P., et J. C. Lehureau. « Optical Readout Of Magnetic Tapes ». Dans International Topical Meeting on Image Detection and Quality, sous la direction de Lucien F. Guyot. SPIE, 1987. http://dx.doi.org/10.1117/12.966785.

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Rilum, John H., et Armand R. Tanguay. « Differential interferometric readout optical disk spatial light modulators ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.turr8.

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In combination with image-based recording and parallel readout, optical disks are promising spatial light modulator candidates for optical information processing and computing applications.1,2 Highly parallel readout performance of such optical disk spatial light modulators can be achieved by utilizing a differential interferometric readout technique.1 Gray scale capability can be incorporated into these optical disk spatial light modulators (ODSLMs) by binary area encoding at the expense of the pixel resolution. It has previously been shown experimentally1 that gray level encoding on ODSLMs read out by the differential interferometric technique produces extremely linear transfer function characteristics with relatively high total throughput efficiencies. We discuss a computer simulation of the ODSLM that verifies the transfer function linearities and quantitatively explains the experimentally obtained throughput efficiencies. The simulation is based on scalar diffraction theory using an angular spectrum approach in combination with a full three-dimensional ray-trace description of the (optically birefringent) components in the ODSLM. The technological limitations of this spatial light modulator approach are discussed in terms of the obtainable pixel resolution for a given requirement of throughput efficiency and linearity. Comparisons with other direct imaging readout techniques, such as Schlieren imaging, are also given in terms of total throughput efficiency, linearity, and usable dynamic range.

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Rapports d'organisations sur le sujet "Optical readout"

Psaltis, Demetri. Parallel Readout of Optical Disks. Fort Belvoir, VA : Defense Technical Information Center, août 1992. http://dx.doi.org/10.21236/ada256625.

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Wang, Feiling. High Density Optical Readout Nonvolatile RAMs. Fort Belvoir, VA : Defense Technical Information Center, février 1995. http://dx.doi.org/10.21236/ada300416.

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Vergara Limon, M. C. Sergio. Design and Performance Characteristics of the Optical Readout and Control Interface for the BTeV Pixel Vertex Detector. Office of Scientific and Technical Information (OSTI), janvier 2000. http://dx.doi.org/10.2172/1421427.

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Raghavan, Ajay. TRANSENSOR : Transformer Real-time Assessment INtelligent System with Embedded Network of Sensors and Optical Readout. Final Report. Office of Scientific and Technical Information (OSTI), avril 2020. http://dx.doi.org/10.2172/1615666.

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Haritonidis, Joseph H. The Development of a Fiber-Optic Readout Pressure Transducer. Fort Belvoir, VA : Defense Technical Information Center, juin 1991. http://dx.doi.org/10.21236/ada238393.

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McConaghy, C. Evaluation of White Light Sources For an Absolute Fiber Optic Sensor Readout System. Office of Scientific and Technical Information (OSTI), octobre 2003. http://dx.doi.org/10.2172/15009728.

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