中国科学院机构知识库网格系统: 检索

Advances in critical technologies for hypersonic and high-enthalpy wind tunnel 期刊论文 OAI收割
CHINESE JOURNAL OF AERONAUTICS, 2020, 卷号: 33, 期号: 12, 页码: 3027-3038
作者: Jiang ZL(姜宗林); Hu ZM(胡宗民); Wang YP(汪运鹏); Han GL(韩桂来)

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High-enthalpy flow Hypersonic wind tunnel Aerospace vehicle Aerodynamic balance Heat flux sensor Optical measurement technique

The research of the accurate measure of static transfer function for the TDI CCD camera (EI CONFERENCE) 会议论文 OAI收割
3rd International Photonics and OptoElectronics Meetings, POEM 2010, November 2, 2010 - November 5, 2010, Wuhan, China
Guo-Ning L.; Long-Xu J.; Jian-Yue R.; Wen-Hua W.; Shuang-Li H.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

In the test course of static transfer function of TDI CCD camera because of the influence that gets environmental and artificial etc. factor the value of static transfer function measured at any time is between unceasing fluctuation so make accuracy reduce. To solve this problem a kind of accurate measurement technique of static transfer function is put forward. First before carrying out the measure of static quiet of transfer function the best test point of transfer function of the TDI CCD camera must be determined it is parallel to guarantee the rectangle target surface of parallel optical pipe and camera focal plane maintenance parallel and again guarantee target strip in rectangle target and TDI CCD in camera focal plane maintenance vertical. TDI CCD catches rectangle target image per 1000 lines of target mark image as a measures sample of static transfer function exclude because of atmosphere tremble twisted vague rectangle target mark image retain 500 distinct and steady target mark image as measure sample set. Then calculate the static transfer function of each measure sample respectively take the average of all static quiet transfer function in measure sample set as the static transfer function of camera. Finally the measure of the static transfer function for TDI CCD camera makes error analysis. Experimental results indicate that the value of the static transfer function of TDI CCD camera measured with this kind of method is 0.2923 with before measurement technique comparison the value of static transfer function has raised 0.02 makes the accuracy of the measure of static transfer function have gotten raising.

Modulation transfer function measurement of sampled imaging systems in field test (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者: Yang L.; Zhang J.; Zhang J.; Zhang J.; Wang J.

收藏 | 浏览/下载：36/0 | 提交时间：2013/03/25

A digital mirror device (DMD) based light projector was developed as the target generator in modulation transfer function (MTF) measurement. In order to overcome the sampling-scene phase effect in MTF measurement of sampled imaging systems a method using random targets is introduced to yield a phase-averaged MTF. The main potential problem of implementing this method is the fact that the stationary assumption of the random targets may be vitiated in practical measurement especially in field test due to the ill condition. We provide an efficient model-independent way of analyzing and isolating the spectral contents arising from these additional contributions to MTF measurement. Algorithms with adaptive parameter selection were also developed for spectral estimation of the test image in order to overcome the challenge brought by the size limit of the test matrices for one certain field of view derived from the isoplantic region. The MTF measurement of a CCD video imager is used to demonstrate the measurement technique and illustrate the benefits over other methods. In order to validate the results comparisons have been made between MTF measurements of imager implemented using this method and bar target direct measurements. 2010 Copyright SPIE - The International Society for Optical Engineering.

Linearity measurement for image-intensified CCD (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者: Zhang L.; Zhao Y.; Zhao Y.; Zhao Y.; Yan F.

收藏 | 浏览/下载：44/0 | 提交时间：2013/03/25

To the characteristic of the ultraviolet CCD (UV ICCD) technique of the linearity measurement of the UV ICCD camera is studied based on the theory of radiometry. Approach of linearity measurement is discussed and a kind of measurement system of the UV ICCD has been developed based on the method of neutral density filter. It is very important that the transmittance of the filter is independent of the wavelength in the method of neutral density filter. Black metal screen mesh with different transmittance is used in our system and calibration of the filters' transmittance in different working positions has been done. Meanwhile to assure the uniform of the received radiation on the target of the detector at any test points an integrating sphere is placed behind the neutral filter to balance light. The whole measurement system mainly consists of a deuterium lamp with high stabilization the attenuation film with transmission integrating sphere optical guide and electro-shift platform. Auto control is realized via special software during the test. With this instrument the linearity of the UV ICCD was measured. Experimental results show that the nonlinearity of the UV ICCD under fixed-gain is less than 2% and the uncertainty of measurement system is less than 4%. 2010 Copyright SPIE - The International Society for Optical Engineering.

New phase measurement method for laser rangefinder (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者: Meng Z.; Meng Z.

收藏 | 浏览/下载：36/0 | 提交时间：2013/03/25

A new phase measurement method is designed and presented by using the technique of signal shifting phase and the technique of signal multiplication for laser rangefinder. The intensity of laser light is modulated by cosine circuit signal at the same time the cosine circuit signal is thansformed sine signal by the shifting phase technique. Two signals mentioned above are multiplied by received signal from the target respectively then being transmitted into signal processor after passing through low band filter respectively. The result of phase-shift between the received signal and sent signal is calculated by means of signal processor and time-counter with double frequency of modulation signal. The proposed system is composed of four units such as control and count unit emitting and receiving unit of laser light signal processing unit and result display unit. The two most advantages of proposed system over others are its ability of proper isolation which reduces crosstalk and its independency thermal drift. Theoretical calculations and experimental results have shown the accuracy better than 2 mm. 2010 Copyright SPIE - The International Society for Optical Engineering.

Electro-optical sampling non-synchronous delay scanning measurement of electron beam bunch length at BFEL 期刊论文 OAI收割
CHINESE PHYSICS C, 2010, 卷号: 34, 期号: 2, 页码: #REF!
作者: Sun DR(孙大睿); Xu JQ(徐金强); Chen SY(陈森玉); Sun, DR; Xu, JQ

收藏 | 浏览/下载：58/0 | 提交时间：2016/04/12

electro-optical sampling measurement of electron beam bunch length non-synchronous delay scanning technique

Electro-optical sampling non-synchronous delay scanning measurement of electron beam bunch length at BFEL 期刊论文 OAI收割
中国物理C, 2010, 期号: 2, 页码: 227-230
作者: Sun DR(孙大睿); Xu JQ(徐金强); Chen SY(陈森玉)

收藏 | 浏览/下载：60/0 | 提交时间：2015/12/07

electro-optical sampling measurement of electron beam bunch length non-synchronous delay scanning technique

Lineshape Analysis of the Beat Signal Between Optical Carrier and Delayed Sidebands 期刊论文 OAI收割
ieee journal of quantum electronics, 2010, 卷号: 46, 期号: 3, 页码: 347-353
Zhu NH (Zhu Ning Hua); Man JW (Man Jiang Wei); Zhang HG (Zhang Hong Guang); Ke JH (Ke Jian Hong); Han W (Han Wei); Chen W (Chen Wei); Liu Y (Liu Yu); Wang X (Wang Xin); Yuan HQ (Yuan Hai Qing); Xie L (Xie Liang)

收藏 | 浏览/下载：109/3 | 提交时间：2010/04/13

Coherence heterodyne technique intensity modulation optical spectrum lineshape linewidth SELF-HETERODYNE INTERFEROMETER LASER LINEWIDTH MEASUREMENT SURFACE-EMITTING LASER SEMICONDUCTOR-LASER MODULATION DIODES

Scaling and analyzing the influence of fluid surface of fluid with nano-granular through speckle pattern experiment (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Wang X.; Wang Y.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

An optical system with double beam interference system was designed to measure the movement of nano-particles in fluid with laser speckle technology. In order to investigate the influence of the scattering light generated from liquid surface on speckle patterns the liquid surface contour was dynamically detected by WYKO during nano-particle movement. The result demonstrates that the fluctuation of fluid surface is slight. Meanwhile in order to further analyze this effect a piece of ground glass was employed. The process of ground glass to be polished to optical glass was studied and tested continuously using WYKO and laser speckle technology. And then the speckle patterns generated from kerosene fluid surface were studied. By contrast the results show that the fluid surface is transparent to the measurement wavelength. The influence of the surface of fluid can be neglected. Furthermore the conclusion illustrates that laser speckle technique is an effective and reliable method to study the movement of nano-granular in fluid.

Study of micro-actuator with electrostatic actuating (EI CONFERENCE) 会议论文 OAI收割
ICO20: MEMS, MOEMS, and NEMS, August 21, 2005 - August 26, 2005, Changchun, China
作者: Liu C.-X.; Liu C.-X.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

The micro-actuator with the torsion beam and the cantilever beam on silicon is designed and analyzed which is actuated by electrostatic force. Based on the torsion dynamics theory the technique and relative formula are presented for analyzing the actuating voltage and the switching time on which the effect of the air squeeze film damping is already considered. The optimized results of the structural parameters are compared between this technique and the finite element modeling (FEM). The optimized result of parameters is as: length width and thickness of the torsion beam are 700 12 and 10m length and width of the cantilever beam are 1900 and 1000m length and width of the balance beam are 100 and 1000m and distance of the upper and lower electrodes is 55m respectively. The actuating voltage is about 50 V and the switching time Toff and Ton are about 5 and 12 ms respectively. The computed results show that the air squeeze film damping is an important factor for the study of dynamic response on micro-actuator. Finally an optical technique is described for the measurement of the actuating voltage and switching time of the device and the difference between the experimental results and theoretical datum is discussed.