Articles de revues : « Optical design technique »

1

Zheng, Yan-Fel, et Jin-Fa Tang. « New automatic design technique for optical coatings ». Applied Optics 26, n^o 8 (15 avril 1987) : 1546. http://dx.doi.org/10.1364/ao.26.001546.

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Chiwo, F. S., et And F. J. Gonzalez. « Design and implementation of a low-cost portable Raman spectrometer ». Revista Mexicana de Física 65, n^o 3 (7 mai 2019) : 274. http://dx.doi.org/10.31349/revmexfis.65.274.

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Non-invasive medical diagnosis has become popular due to the possibility of detecting illnesses in vivo and in real time this technique, often referred to as "optical biopsy", comprises several optical techniques such as thermography, diffuse reflectance spectroscopy, optical coherence tomography and Raman spectroscopy among others. Particularly Raman spectroscopy is an optical technique based on the inelastic scattering of light that can detect disease markers, this technique has been successfully used to detect several types of diseases, however the high price of a Raman spectrometer makes it difficult for the medical community to adopt its use as a common diagnostic procedure. In this work a Raman spectroscopy system was designed and fabricated from low-cost readily available components. The system was characterized and the Raman spectra obtained was compared to commercial systems. Results show that it is possible to fabricate a custom Raman system with the desired optical configuration for non-invasive optical diagnosis at low costs and portable size.

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Matsuda, Hisashi. « Ion optical design technique of high performance mass spectrometer. » Journal of the Mass Spectrometry Society of Japan 37, n^o 3 (1989) : 149–65. http://dx.doi.org/10.5702/massspec.37.149.

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Bai, Jinlin, Huasong Liu, Ziyang Li, Peng Sun, Xiao Yang, Shida Li et Jianzhong Su. « Research on Optical and Mechanical Compatible Design Technology of Multilayer Films ». Photonics 9, n^o 12 (24 novembre 2022) : 897. http://dx.doi.org/10.3390/photonics9120897.

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The stress’s accumulation will critically affect optical device stability, leading to components’ deviation and film peeling. Stress control techniques based on strain cancelation cannot precisely match film stress, and it is difficult to reduce the total stress of multilayer film to ultra-low levels. Existing software for film system design is mainly based on 2D design concepts such as wavelength-spectrum and does not consider 3D design concepts such as wavelength-spectrum-stress, but the stress parameter plays an essential role in film performance, and it is necessary to use it as an optimization index for film design. In this paper, we introduce mechanical synchronization design into film system design. The multilayer film’s optimal structure is precisely matched by the genetic algorithm, and an ultra-low stress and wide-spectrum optical film element is developed under the dual requirements of optical performance and mechanical performance. This technique incorporates computer-aided design and automatically seeks an optimal combination of layered film nanostructures through self-compiled optical and mechanical compatible design software. While ensuring invariant optical properties, it can effectively reduce the total stress of multilayer film. This can provide a new idea for film stress control.

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O'Sullivan, C., M. De Petris, G. Amico, E. S. Battistelli, P. de Bernardis, D. Burke, D. Buzi et al. « QUBIC VIII : Optical design and performance ». Journal of Cosmology and Astroparticle Physics 2022, n^o 04 (1 avril 2022) : 041. http://dx.doi.org/10.1088/1475-7516/2022/04/041.

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Abstract The Q and U Bolometric Interferometer for Cosmology (QUBIC) is a ground-based experiment that aims to detect B-mode polarization anisotropies [1] in the CMB at angular scales around the ℓ ≃100 recombination peak. Systematic errors make ground-based observations of B modes at millimetre wavelengths very challenging and QUBIC mitigates these problems in a somewhat complementary way to other existing or planned experiments using the novel technique of bolometric interferometry. This technique takes advantage of the sensitivity of an imager and the systematic error control of an interferometer. A cold reflective optical combiner superimposes the re-emitted beams from 400 aperture feedhorns on two focal planes. A shielding system composed of a fixed groundshield, and a forebaffle that moves with the instrument, limits the impact of local contaminants. The modelling, design, manufacturing and preliminary measurements of the optical components are described in this paper.

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Sun, Ke Xue, Xian Jun Li, Shao Fang Zhang et Hao Zheng. « A Design Technique and Structure for Optical Fibre Vibration Sensor ». Applied Mechanics and Materials 687-691 (novembre 2014) : 3462–65. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3462.

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This paper reviewed techniques of vibration sensors, studied structure and working principle of phase modulated optical fiber vibration sensor, and designed a new structure of non-contact optical vibration sensor. Use this structure, expect accuracy of 0.1um can be obtained in the range of 1mm. At the same time, this system is simple, anti-interference ability, high reliability and ease of practical.

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Das, Bhagwan, M. F. L. Abdullah, Fayaz Ali Dharejo, Farah Deeba, Jawad Ali, Kamran Ali Memon et Yuanchun Zhou. « Modeling and design of enhanced all optical signal regeneration technique ». Optik 238 (juillet 2021) : 166696. http://dx.doi.org/10.1016/j.ijleo.2021.166696.

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Guo, P., S. Y. Zheng, C. N. Yen et X. Ma. « Reflectance diagram-aided technique for optical coating design and monitoring ». Applied Optics 28, n^o 14 (15 juillet 1989) : 2876. http://dx.doi.org/10.1364/ao.28.002876.

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Kim, Bong-Hyun. « Design of Optical 3D Scanner Using Sub Pixel Accuracy Technique ». Journal of Korean Institute of Information Technology 15, n^o 11 (30 novembre 2017) : 149–54. http://dx.doi.org/10.14801/jkiit.2017.15.11.149.

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Tikhonravov, A. V., M. K. Trubetskov et G. W. DeBell. « Optical coating design approaches based on the needle optimization technique ». Applied Optics 46, n^o 5 (25 janvier 2007) : 704. http://dx.doi.org/10.1364/ao.46.000704.

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CUI Yuan, 崔媛, 周德春 ZHOU Dechun, 于凤霞 YU Fengxia, 谭芳 TAN Fang et 杨军 YANG Jun. « Matching Design of Optical Fiber Image Bundle by Acid-leaching Technique ». ACTA PHOTONICA SINICA 40, n^o 2 (2011) : 186–89. http://dx.doi.org/10.3788/gzxb20114002.0186.

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Abdelrahman, Diaaeldin, Christopher Williams, Odile Liboiron-Ladouceur et Glenn E. R. Cowan. « A Novel Inductorless Design Technique for Linear Equalization in Optical Receivers ». Journal of Low Power Electronics and Applications 12, n^o 2 (1 avril 2022) : 19. http://dx.doi.org/10.3390/jlpea12020019.

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To mitigate the trade-off between gain and bandwidth of CMOS multistage amplifiers, a receiver front-end (FE) that employs a high-gain narrowband transimpedance amplifier (TIA) followed by an equalizing main amplifier (EMA) is proposed. The EMA provides a high-frequency peaking to extend the FE’s bandwidth from 25% to 60% of the targeted data rate fbit. The peaking is realized by adding a pole in the feedback paths of an active feedback-based wideband amplifier. By embedding the peaking in the main amplifier (MA), the front-end meets the sensitivity and gain of conventional equalizer-based receivers with better energy efficiency by eliminating the equalizer stages. Simulated in TSMC 65 nm CMOS technology, the proposed front-end achieves 7.4 dB and 6 dB higher gain at 10 Gb/s and 20 Gb/s, respectively, compared to a conventional front-end that is designed for equal bandwidth and dissipates the same power. The higher gain demonstrates the capability of the proposed technique in breaking the gain-bandwidth trade-off. The higher gain also reduces the power penalty incurred by the decision circuit and improves the sensitivity by 1.5 dB and 2.24 dB at 10 Gb/s and 20 Gb/s, respectively. Simulations also confirm that the proposed FE exhibits a robust performance against process and temperature variations and can support large input currents.

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Savchenko, Ekaterina, Ilya Kolokolnikov, Elena Velichko, Victor Osovskikh, Lyubov Kiseleva et Zhyldyz Musakulova. « Design of Liver Functional Reserve Estimation Technique Based on Optical Densitometry ». Diagnostics 10, n^o 8 (16 août 2020) : 599. http://dx.doi.org/10.3390/diagnostics10080599.

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This work is aimed at creating a modified invasive technique for assessing the liver’s functional reserves. A study of the degree of hepatodepression is carried out by measuring the plasma elimination of indocyanine green using the method of optical densitometry. This paper presents test results for an aqueous solution and an albumin solution, as well as the results of measurements of plasma elimination of indocyanine green for patients with liver disease. Perfecting the proposed method will make an important scientific contribution to modern diagnostic medicine. Diagnosing the stages in the progression of the disease and its developing complications can make it possible to rapidly correct the patient’s treatment algorithm, achieving positive outcomes in medical practice.

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Verly, P. G. « Fourier transform technique with frequency filtering for optical thin-film design ». Applied Optics 34, n^o 4 (1 février 1995) : 688. http://dx.doi.org/10.1364/ao.34.000688.

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Li, Dan, Gabriele Minoia, Matteo Repossi, Daniele Baldi, Enrico Temporiti, Andrea Mazzanti et Francesco Svelto. « A Low-Noise Design Technique for High-Speed CMOS Optical Receivers ». IEEE Journal of Solid-State Circuits 49, n^o 6 (juin 2014) : 1437–47. http://dx.doi.org/10.1109/jssc.2014.2322868.

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Vlček, Jaroslav, Jaromír Pištora et Michal Lesňák. « Design of Plasmonic-Waveguiding Structures for Sensor Applications ». Nanomaterials 9, n^o 9 (29 août 2019) : 1227. http://dx.doi.org/10.3390/nano9091227.

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Surface plasmon resonance has become a widely accepted optical technique for studying biological and chemical interactions. Among others, detecting small changes in analyte concentration in complex solutions remains challenging, e.g., because of the need of distinguishing the interaction of interest from other effects. In our model study, the resolution ability of plasmonic sensing element was enhanced by two ways. Besides an implementation of metal-insulator-metal (MIM) plasmonic nanostructure, we suggest concatenation with waveguiding substructure to achieve mutual coupling of surface plasmon polariton (SPP) with an optical waveguiding mode. The dependence of coupling conditions on the multilayer parameters was analyzed to obtain optimal field intensity enhancement.

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Pearson, Joseph, Marcel Hofstetter, Thomas Dekorsy, Michael Totzeck et Helmut Cölfen. « Design concepts in absorbance optical systems for analytical ultracentrifugation ». Analyst 143, n^o 17 (2018) : 4040–50. http://dx.doi.org/10.1039/c8an00706c.

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Analytical ultracentrifugation is a powerful technique for analyzing particles in solution, and has proved valuable for a wide range of applications in chemistry, biochemistry and material sciences for many years.

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CHEN, CHAO-WEI, et YU CHEN. « OPTIMIZATION OF DESIGN PARAMETERS FOR FLUORESCENCE LAMINAR OPTICAL TOMOGRAPHY ». Journal of Innovative Optical Health Sciences 04, n^o 03 (juillet 2011) : 309–23. http://dx.doi.org/10.1142/s1793545811001435.

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Laminar optical tomography (LOT) is a mesoscopic tomographic imaging technique ranging between confocal microscopy and diffuse optical tomography (DOT). Fluorescence LOT (FLOT) provides depth-resolved molecular information with 100–200 μm resolution over 2–3 mm depth. In this study, we use Monte Carlo simulation and singular-value analysis (SVA) to optimize the source-detector configurations for potential enhancement of FLOT imaging performance. The effects of different design parameters, including source incidence and detector collection angles, detector number, and sampling density, are presented. The results indicate that angled incidence/detection configuration might improve the imaging resolution and depth sensitivity, especially for low-scattering medium. Increasing the number of detectors and the number of scanning steps will also result in enhanced imaging performance. We also demonstrate that the optimal imaging performance depends upon the background scattering coefficient. Our result might provide an optimization strategy for FLOT or LOT experimental setup.

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Jang, Hyeok, Hyeon-Gi Kim, Gwang-Seon Kim et Gyeong-Hwa Im. « The Optimal Design of Air Bearing Sliders of Optical Disk Drives by Using Simulated Annealing Technique ». Transactions of the Korean Society of Mechanical Engineers A 26, n^o 8 (1 août 2002) : 1545–51. http://dx.doi.org/10.3795/ksme-a.2002.26.8.1545.

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Ghanim Wadday, Ahmed Ghanim Wadday, Faris Mohammed Ali et Hayder Jawad Mohammed Albattat. « Design of high scalability multi-subcarrier rof hybrid system based on optical CDMA/TDM ». Indonesian Journal of Electrical Engineering and Computer Science 21, n^o 2 (1 février 2021) : 927. http://dx.doi.org/10.11591/ijeecs.v21.i2.pp927-937.

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<span>The technology of radio over fiber (RoF) regard a crucial point to solve problems in wireless communication system. As well as, the growth of internet applications also reveals a tremendous increase in bandwidth for different applications. Therefore, the development of optical networks is very important that have maximum bandwidth by using different multiple access techniques. Optical code division multiple access (OCDMA) technique has considered as a good solution for high bandwidth network. Hybrid optical systems of OCDMA and time division multiplexing (OTDM) has been proposed in this paper to increase the number of simultaneous users. The results of hybrid OCDMA and OTDM system demonstrate that this system can make a considerable increase in the network scalability while ensuring sufficient data rate and an acceptable bit error rate. Where M-user OCDMA signals can be transmitted in different channels of an OTDM system. Due to its wide band facility compared with other access techniques, OCDMA used here. In addition to its high scalability for our radio network, the OTDM and SCM utilized. The combination of these efficient access technique and powerful time-sharing media are lead to increase the framework system scalability.</span>

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Yang, Jing Song, Xiu Ling He et Li Xin Li. « Multi-Sensor Life Detection Synergy Platform Design ». Applied Mechanics and Materials 442 (octobre 2013) : 520–25. http://dx.doi.org/10.4028/www.scientific.net/amm.442.520.

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Life detection based on a single type of information sources detection technology cannot completely meet the needs of the earthquake relief. The existing life detection techniques are include of acoustic wave life detection, optical life detection and radar life detection. The advantages and existing problems of the three life detection techniques are analyzed. The advantages and present situation of multi-sensor detection synergy technique are given . We explained the platform structure , multi-sensor selection strategy, and information fusion model. Finally, the development direction of life detection technique based on multi-sensor synergy is forecasted. This platform mainly realizes the infrared image and acoustic wave synchronization collection, analysis and processing of both audio life detection and video detection function, make up for the deficiency of the single sensor life detector, can get a more comprehensive and more accurate information about the scene of rescue and living organisms, is more suitable for complex quake rescue environment.

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Makoui, Somaye, Morteza Savadi-Oskouei, Ali Rostami et Zia Daei Koozehkanani. « DISPERSION FLATTENED OPTICAL FIBER DESIGN FOR LARGE BANDWIDTH AND HIGH-SPEED OPTICAL COMMUNICATIONS USING OPTIMIZATION TECHNIQUE ». Progress In Electromagnetics Research B 13 (2009) : 21–40. http://dx.doi.org/10.2528/pierb08110202.

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Liu Yuhong, 刘玉红, 程其娈 Cheng Qiluan, 谭佐军 Tan Zuojun et 陈建军 Chen Jianjun. « Design of high resolution optical spectrum detecting system based on interference technique ». Infrared and Laser Engineering 48, n^o 4 (2019) : 417005. http://dx.doi.org/10.3788/irla201948.0417005.

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Lee, Sung Hwa, Vinayagam Mariappan, Dong Chan Won, Myungsuk Ann et Seungyoun Yang. « Design of Optical Biological Sensor for Phycocyanin Parameters Measurement using Fluorescence Technique ». International journal of advanced smart convergence 5, n^o 2 (30 juin 2016) : 73–79. http://dx.doi.org/10.7236/ijasc.2016.5.2.73.

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Tikhonravov, Alexander V., Michael K. Trubetskov et Gary W. DeBell. « Application of the needle optimization technique to the design of optical coatings ». Applied Optics 35, n^o 28 (1 octobre 1996) : 5493. http://dx.doi.org/10.1364/ao.35.005493.

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Wang, Xiaodong, Baoqing Li, Onofrio L. Russo, Harry T. Roman, Ken K. Chin et Kenneth R. Farmer. « Diaphragm design guidelines and an optical pressure sensor based on MEMS technique ». Microelectronics Journal 37, n^o 1 (janvier 2006) : 50–56. http://dx.doi.org/10.1016/j.mejo.2005.06.015.

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Rashidi, C. B. M., S. A. Aljunid, S. A. Aljunid, M. S. Anuar et S. Yaakob. « Effective Design for Optical CDMA Based on Radio over Fiber (RoF) Technique ». MATEC Web of Conferences 97 (2017) : 01100. http://dx.doi.org/10.1051/matecconf/20179701100.

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Conde, Olga M., Pedro M. Cortés et José M. López-Higuera. « A new design technique for optical multipass cells modelled with arbitrary surfaces ». Microwave and Optical Technology Letters 37, n^o 5 (5 juin 2003) : 383–87. http://dx.doi.org/10.1002/mop.10925.

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Greisukh, Grigoriy Isaevitch, Il’ya Anatolievich Levin et Eugeniy Grigorievich Ezhov. « Design of Ultra-High-Aperture Dual-Range Athermal Infrared Objectives ». Photonics 9, n^o 10 (8 octobre 2022) : 742. http://dx.doi.org/10.3390/photonics9100742.

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We present a technique that includes the principles of selecting the layout of the optical scheme and recommendations for the choice of the initial design parameters for designing ultra-high-aperture dual-range athermal infrared objectives. The versatility and efficiency of the proposed technique are demonstrated using examples of the design of the refractive and refractive-diffractive version of the objectives, and the obtained optical performance is discussed.

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Isaac, Annie Shalom, et Cornelius Neumann. « Optimization of freeform surfaces using intelligent deformation techniques for LED applications ». Advanced Optical Technologies 7, n^o 1-2 (25 avril 2018) : 67–80. http://dx.doi.org/10.1515/aot-2017-0074.

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AbstractFor many years, optical designers have great interests in designing efficient optimization algorithms to bring significant improvement to their initial design. However, the optimization is limited due to a large number of parameters present in the Non-uniform Rationaly b-Spline Surfaces. This limitation was overcome by an indirect technique known as optimization using freeform deformation (FFD). In this approach, the optical surface is placed inside a cubical grid. The vertices of this grid are modified, which deforms the underlying optical surface during the optimization. One of the challenges in this technique is the selection of appropriate vertices of the cubical grid. This is because these vertices share no relationship with the optical performance. When irrelevant vertices are selected, the computational complexity increases. Moreover, the surfaces created by them are not always feasible to manufacture, which is the same problem faced in any optimization technique while creating freeform surfaces. Therefore, this research addresses these two important issues and provides feasible design techniques to solve them. Finally, the proposed techniques are validated using two different illumination examples: street lighting lens and stop lamp for automobiles.

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Yao, Jie, Yuan Wang, Kun-Tong Tsai, Zhaowei Liu, Xiaobo Yin, Guy Bartal, Angelica M. Stacy, Yuh-Lin Wang et Xiang Zhang. « Design, fabrication and characterization of indefinite metamaterials of nanowires ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 369, n^o 1950 (13 septembre 2011) : 3434–46. http://dx.doi.org/10.1098/rsta.2011.0159.

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Indefinite optical properties, which are typically characterized by hyperbolic dispersion relations, have not been observed in naturally occurring materials, but can be realized through a metamaterial approach. We present here the design, fabrication and characterization of nanowire metamaterials with indefinite permittivity, in which all-angle negative refraction of light is observed. The bottom-up fabrication technique, which applies electrochemical plating of nanowires in porous alumina template, is developed and demonstrated in achieving uniform hyperbolic optical properties at a large scale. We developed techniques to improve the uniformity and to reduce the defect density in the sample. The non-magnetic design and the off-resonance operation of the nanowire metamaterials significantly reduce the energy loss of electromagnetic waves and make the broad-band negative refraction of light possible.

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Wuibaut, G., G. Bois, M. El Hajem, A. Akhras et J. Y. Champagne. « Optical PIV and LDV Comparisons of Internal Flow Investigations in SHF Impeller ». International Journal of Rotating Machinery 2006 (2006) : 1–9. http://dx.doi.org/10.1155/ijrm/2006/69521.

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The paper presents a comparison between two sets of experimental results in a centrifugal flow pump. The tested impeller is the so-called SHF impeller for which many experimental data have been continuously produced to built databases for CFD code validations with various levels of approximation. Measurements have been performed using optical techniques: 2D particle image velocimetry (PIV) technique on an air test model and 2D laser doppler velocimetry (LDV) technique on a water model, both for different flow rates. For the present study, results obtained by these optical techniques are compared together in terms of phase averaged velocity and velocity fluctuations inside the impeller flow passage for design flow rate.

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Jalali, Mandana, Hamid Nadgaran et Daniel Erni. « Semiperiodic Ultra-Broadband Double-Grating to Improve c-Si Thin-Film Solar Cell’s Optical Absorption, through Numerical Structural Optimization ». Crystals 9, n^o 5 (21 mai 2019) : 264. http://dx.doi.org/10.3390/cryst9050264.

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Plasmonic gratings provide effective photon management techniques in thin-film solar cells, capable of extending the optical thickness of the solar cell’s active layer. However, the ultra-broadband nature of such application makes an optimal design of the grating structure quite challenging, since a fully periodic grating operates only in specific spectral ranges. To achieve a more broadband design, semiperiodicity is introduced, which, due to having controllable disorder, is an apt solution in broadband optical applications. In this work, semiperiodic double gratings as a broadband photon management technique are introduced in order to improve the optical absorption of c-Si thin-film solar cells, and optimized through numerical structural optimization. Physical parameters of both front and back gratings are determined taking the spectrally integrated optical absorption as the figure of merit and subsequently a semiperiodic double grating is established through adding defects to the fully periodic structure. It is shown that such semiperiodic structure is capable of enhancing the spectrally integrated optical absorption 88.6 % compared to a reference structure without gratings.

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Awwal, Abdul Ahad S., et Mohammad A. Karim. « Design of polarization-encoded optical shadow-casting logic units using truth-table partitioning ». Canadian Journal of Physics 66, n^o 10 (1 octobre 1988) : 841–43. http://dx.doi.org/10.1139/p88-137.

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The input pixel size of a polarization-encoded optical shadow-casting logic system is reduced by means of truth-table partitioning. The proposed design algorithm is used to encode the inputs of a three-input, two-output binary full adder. A comparison with alternative designs proves that the technique leads to an improved memory-efficient optical computing unit.

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Bastianini, Filippo, Raffaella Di Sante, Francesco Falcetelli, Diego Marini et Gabriele Bolognini. « Optical Fiber Sensing Cables for Brillouin-Based Distributed Measurements ». Sensors 19, n^o 23 (26 novembre 2019) : 5172. http://dx.doi.org/10.3390/s19235172.

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Brillouin distributed optical fiber sensing (Brillouin D-FOS) is a powerful technology for real-time in situ monitoring of various physical quantities, such as strain, temperature, and pressure. Compared to local or multi-point fiber optic sensing techniques, in Brillouin-based sensing, the optical fiber is interrogated along its complete length with a resolution down to decimeters and with a frequency encoding of the measure information that is not affected by changes in the optical attenuation. The fiber sensing cable plays a significant role since it must ensure a low optical loss and optimal transfer of the measured parameters for a long time and in harsh conditions, e.g., the presence of moisture, corrosion, and relevant mechanical or thermal stresses. In this paper, research and application regarding optical fiber cables for Brillouin distributed sensing are reviewed, connected, and extended. It is shown how appropriate cable design can give a significant contribution toward the successful exploitation of the Brillouin D-FOS technique.

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Rose, M. L. J., T. G. Mackay, W. Martin et D. J. Wheatley. « Evaluation of four blood pump geometries : The optical tracer technique ». Proceedings of the Institution of Mechanical Engineers, Part H : Journal of Engineering in Medicine 214, n^o 4 (1 avril 2000) : 371–83. http://dx.doi.org/10.1243/0954411001535417.

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Artificial blood pump assistance of the failing human heart can allow it to recover. Analysis of blood pump fluid flow is a useful tool for design development and thrombosis minimization. The aim of this study was to investigate fluid flow, particularly ventricular clearance rate and stagnation areas, in four different blood pump geometries and to determine the best design. The blood pumps consisted of a polyurethane ventricle, and combinations of inlet/outlet pipe angles and compression plate shapes. A video camera recorded the motion of fluid labelled with an optical tracer (Methyl Blue histological dye). A novel processing method was developed to produce colour maps of tracer concentration, experimentally calibrated. An overall picture of fluid flow in each pump geometry was generated by considering clearance curves, tracer concentration maps and inflow jet animations. Overall and local mixing coefficients are calculated for each pump. The best geometry featured straight inlet/outlet pipes and a domed compression plate. This optical tracer technique has proven convenient, economical, sensitive to low concentrations of tracer and provides instantaneous pictures of tracer distribution in a ventricle.

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Li, Li-Qun, Chang-Hong Liang, Gang Li et Zhe Sun. « THE DESIGN TECHNIQUE FOR COAXIAL RESONATOR CAVITY DUPLEXER ». Progress In Electromagnetics Research M 2 (2008) : 105–14. http://dx.doi.org/10.2528/pierm08033102.

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Zz, Mi, C. Cong, Y. Cheng et Zhang Hm. « Study on defects detection technique of precise optical element ». E3S Web of Conferences 53 (2018) : 01037. http://dx.doi.org/10.1051/e3sconf/20185301037.

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Aiming at the problems of low efficiency of traditional detection methods for surface defects of precision optical element and inconvenient detection for optical elements of different calibers, a adjustable optical element defects detecting device for large laser devices is designed. The key technical points of system composition, detection environment, illumination design and image stitching are expounded. According to the characteristics of surface defects of optical element, such as the difference of contour, gray scale, contrast and ambiguity, a classification method based on FCM is proposed. The experimental results show that the system can realize the automatic detection of surface defects, also it can effectively distinguishes micron-scale defects and has good defect recognition performance. The overall average recognition rate reached to 93.3%.

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Wu Haoyu, 吴浩煜, 时雷 Shi Lei, 马挺 Ma Ting, 马金栋 Ma Jindong, 路桥 Lu Qiao, 孙青 Sun Qing et 毛庆和 Mao Qinghe. « Design and Development Technique for Optical Frequency Comb Based on Femtosecond Fiber Lasers ». Chinese Journal of Lasers 44, n^o 6 (2017) : 0601008. http://dx.doi.org/10.3788/cjl201744.0601008.

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Sharma, Anurag, et AK Ghatak. « Gradient-Index Optical Imaging Systems : A New Efficient Technique for Design and Analysis ». IETE Journal of Research 33, n^o 4 (juillet 1987) : 129–33. http://dx.doi.org/10.1080/03772063.1987.11436679.

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Tanaka, Hideyuki, Takeshi Kobayashi, Tetsuya Saitoh, Yoshiyuki Suzuki et Shigeru Kawai. « Design Technique of Crossed Gratings for Beam Couplers in Large-Core Optical Fibers ». Japanese Journal of Applied Physics 41, Part 1, No. 7B (30 juillet 2002) : 4817–20. http://dx.doi.org/10.1143/jjap.41.4817.

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Li, Jie, et Yu Rui Yang. « Automatic System Design for Cheque Discrimination Based on OCR Technique ». Applied Mechanics and Materials 556-562 (mai 2014) : 2237–39. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.2237.

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Aiming at how to solve the problem of cheque image discrimination quickly and accurately,an automatic system for cheque discrimination by using Optical Character Recgnition (OCR) technique based on the features of a cheque image was designed and developed, the main functional modules and key technologies of the system were studied, and all the functional modules were organized in a good logic way,finally, the automatic system for cheque discrimination was intergratted. The results of the experimental tests showed that the system can identify the information of one cheque quickly and accurate, the discrimination results were good.

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Martis, Joel, Ze Zhang, Hao-Kun Li, Ann Marshall, Roy Kim et Arun Majumdar. « Design and Construction of an Optical TEM Specimen Holder ». Microscopy Today 29, n^o 5 (septembre 2021) : 40–44. http://dx.doi.org/10.1017/s1551929521001103.

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Abstract:Electron microscopy has enabled atomic resolution imaging of matter. However, unlike optical spectroscopic imaging, traditional electron microscopes provide limited spectroscopic information in terms of their energy resolution. Only recently, owing to advances in monochromated STEM-EELS, have transmission electron microscopes (TEMs) been able to attain a high energy resolution. We recently proposed combining spectrally selective photoexcitation with HRTEM to achieve sub-nanometer scale optical imaging, a technique we called photoabsorption microscopy using electron analysis (PAMELA). To realize PAMELA-TEM experimentally, we constructed a TEM holder with an optical feedthrough, capable of photoexciting materials with different wavelengths. In this article, we describe our process for designing and fabricating an optical TEM specimen holder, highlighting important aspects of the design.

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Kryukov, A. V., Yu Yu Kachurin et Yu S. Datiy. « Design of thermal imaging continuous-zoom optical system ». Journal of Physics : Conference Series 2127, n^o 1 (1 novembre 2021) : 012070. http://dx.doi.org/10.1088/1742-6596/2127/1/012070.

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Abstract The report tells about the design of a middle wave infrared continuous-zoom imaging optical system. To capture the image in an «eye-type» infrared optical system a multi-element sensor is used. To increase the contrast of the thermal image the sensor is equipped with a cold aperture. The use of an optical system based on the continuous-zoom lens makes it possible to solve the problems of object detection and identification more effectively but requires taking into account some features of varifocal lenses. The optical system being analyzed in the report includes front zoom objective system and secondary imaging system. The front zoom optical system is composed of four groups and provides the focal length that is continuously changed with a large zoom ratio (15–20X) under the condition of a constant total length of the system. The secondary imaging system is designed for zoom system exit stop and sensor cold stop conjugation. The design technique represents analytical expressions and equations to obtain optical parameters of the front and secondary system components and the motion curves for movable groups.

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Belfore, L. A., A. A. Arkadan et B. M. Lenhardt. « ANN inverse mapping technique applied to electromagnetic design ». IEEE Transactions on Magnetics 37, n^o 5 (septembre 2001) : 3584–87. http://dx.doi.org/10.1109/20.952667.

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Prasad, Alisha, Syed Mohammad Abid Hasan et Manas Ranjan Gartia. « Optical Identification of Middle Ear Infection ». Molecules 25, n^o 9 (9 mai 2020) : 2239. http://dx.doi.org/10.3390/molecules25092239.

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Ear infection is one of the most commonly occurring inflammation diseases in the world, especially for children. Almost every child encounters at least one episode of ear infection before he/she reaches the age of seven. The typical treatment currently followed by physicians is visual inspection and antibiotic prescription. In most cases, a lack of improper treatment results in severe bacterial infection. Therefore, it is necessary to design and explore advanced practices for effective diagnosis. In this review paper, we present the various types of ear infection and the related pathogens responsible for middle ear infection. We outline the conventional techniques along with clinical trials using those techniques to detect ear infections. Further, we highlight the need for emerging techniques to reduce ear infection complications. Finally, we emphasize the utility of Raman spectroscopy as a prospective non-invasive technique for the identification of middle ear infection.

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Jindal, Sumit Kumar, Srishti Priya et S. Kshipra Prasadh. « Design Guidelines for MEMS Optical Accelerometer based on Dependence of Sensitivities on Diaphragm Dimensions ». Journal of Circuits, Systems and Computers 29, n^o 07 (12 septembre 2019) : 2050107. http://dx.doi.org/10.1142/s0218126620501078.

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This work deals in specifying the design considerations while constructing a Micro Electro Mechanical Systems (MEMS) optical accelerometer working on capacitive sensing technique. Sensitivity is one of the most demanded characteristics of any sensor. The sensor considered is a MEMS capacitive accelerometer in which both displacement and capacitance are the primary sensing characteristics. This differential capacitive accelerometer causes change in displacement due to applied acceleration and further produces change in capacitance. So, the main focus in this work is to improve or select the suitable diaphragm dimensions of the differential capacitor in order to get optimal capacitive and displacement sensitivity. This is done for an Optical MEMS (MOEMS) based sensor where slight change has a large-scale impact. The electrical signal is converted to optical by adding an Optical Interferometer. Mach–Zehnder Interferometer (MZI) is used to carry out the intensity modulation which also gives protection in inflammable surroundings. This makes the system suitable for working in high temperature regions.

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Petzing, J. N., et J. R. Tyrer. « Recent developments and applications in electronic speckle pattern interferometry ». Journal of Strain Analysis for Engineering Design 33, n^o 2 (1 février 1998) : 153–69. http://dx.doi.org/10.1243/0309324981512887.

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Electronic speckle pattern interferometry (ESPI) is a wholefield non-contact optical metrology technique for displacement measurement, based on the optical physics of surface-generated laser speckle. Since its inception during the early 1970s ESPI has gradually evolved into different optical designs and has been applied to a range of engineering and non-engineering applications. Development of ESPI has continued during the 1990s with the introduction of new laser and optical technology into the interferometers, allowing further optimization and extending the potential applicability of the technique. This review considers the most notable developments of interferometer design and application that have occurred and been widely published during the 1990s, and examines the current and near-future direction of research into the technique.

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Rajan, S. D., Ben Nagaraj et Mali Mahalingam. « A Shape Optimal Design Methodology for Packaging Design ». Journal of Electronic Packaging 114, n^o 4 (1 décembre 1992) : 461–66. http://dx.doi.org/10.1115/1.2905481.

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Shape optimal design methodology has been used as a design tool in the automotive and aerospace industries for quite some time now. In the present work the hybrid natural shape optimal design approach is used along with a nonlinear programming (NLP) technique to find the optimal shapes of electronic packaging components. The design problems are formulated as min-max problems and linear and materially nonlinear finite element analyses provide the function values. The applicability of the developed methodology is illustrated using a design example that deals with the packaging design of a plastic pad array carrier digital package. The results indicate that the methodology can be used either as an effective way of evaluating different design alternatives or refining existing designs.

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Cheng, Hao Bo, Tan Wang, Yun Peng Feng et Yeung Yam. « Process Planning and Tool Design of Magnetorehological Jet Finishing ». Applied Mechanics and Materials 44-47 (décembre 2010) : 222–26. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.222.

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Magnetorehological jet finishing (MJF) for optical materials is a promising technique, which characterized as polishing arbitrary surface patterns and correction plates, micro-channels, thin ultra-uniform thickness substrates and near perfect optical components. The process and the machine are complicated. This paper is concerned with the process optimization and tool design, and results obtained by FEA on the designed MJF tool.

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