中国科学院机构知识库网格系统: 检索

The research of round raster readheads scheme (EI CONFERENCE) 会议论文 OAI收割
3rd international Conference on Manufacturing Science and Engineering, ICMSE 2012, March 27, 2012 - March 29, 2012, Xiamen, China
Cong J.-F.

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The round raster is extensively applied in all kinds of high accuracy angular displacement measurement and control system. With the development of precise mechanotronics measuring instrument machining center CNC machine and various precise location testing technology a higher request is put forward to the accuracy and the function of raster measurement system. In this article it is concluded that double readheads is the most reasonable configuration scheme through tests of single readhead scheme two readheads and four readheads. (2012) Trans Tech Publications.

Study on sub-pixel techniques for accurate image measurement of displacement (EI CONFERENCE) 会议论文 OAI收割
2011 2nd International Conference on Advanced Measurement and Test, AMT 2011, June 24, 2011 - June 26, 2011, Nanchang, China
作者: Zhang X.; Zhang X.; Zhang X.

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The high resolving power camera was often used to improve the precision of measuring system although its price is high because the accuracy of image measure was limited by the pixel resolving ability of camera. A method of one dimension gray level quadrature sub-pixel to detect edge was presented. This method was applied to measure the displacement of measuring head on 3-coordinate measuring machine. The data of test was shown that this system can distinguish displacement 0.001mm. it is higher accuracy than pixel level. So this method is convenient and fast fit to track and measure the moving object. It is obvious that this method can save the cost of hardware.

Imaging system effects on the measuring accuracy of the optical surface in interferometer (EI CONFERENCE) 会议论文 OAI收割
3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011, January 6, 2011 - January 7, 2011, Shanghai, China
Yang W.; Liu M.; Xu W.

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In order to measure high accuracy or mid spatial frequency optical surfaces this study investigated imaging system in Fizeau interferometer. Interferometer is a transferring phase information system. General transfer function can't evaluate the ability of imaging system in interferometer that transfers the phase information of the optical surface. So this paper deduced instrument transfer function (ITF) and used ITF to evaluate the phase information transfer ability of interferometer. We obtained some results about ITF of imaging system by numerical simulation when there are different aberrations in imaging system or measuring optical surfaces were different. Our results indicate that ITF can evaluate the ability of transferring phase information in interferometer and the distortion of imaging system evidently affects the accuracy of interferometric measurements. 2010 IEEE.

The study of encoding principle and encoding disc design of a new-style vernier absolute encoder (EI CONFERENCE) 会议论文 OAI收割
2nd Annual Conference on Electrical and Control Engineering, ICECE 2011, September 16, 2011 - September 18, 2011, Yichang, China
作者: Li L.

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To satisfy the requirement of encoder miniaturization high dependability and high measuring accuracy a new-style vernier absolute type encoder which offered significant advantages over less reticling circles and high precision was presented in the paper which carried out the design of vernier encoding disc the analysis of new-style vernier encoding principle and exact encoding track calibration by studying the photoelectric encoder. The Matlab simulation results prove that the encoding and coding methods are feasible. The test showed that the cubage of encoder was quite small and the diameter of the encoder can be controlled within 100mm its resolution can reach 24 bits i.e. 0.0772. The feasibility of encoding and coding method was further proved. 2011 IEEE.

Measuring instrument for radial composite deviations of high-precision master gear (EI CONFERENCE) 会议论文 OAI收割
6th International Symposium on Precision Engineering Measurements and Instrumentation, August 8, 2010 - August 11, 2010, Hangzhou, China
作者: Zhang Y.; Wang L.; Wang L.; Wang L.

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During double flank rolling composite detection the radial composite deviations of master gears has been existed and transferred to the measured gear by the primary harmonic curve. In order to improve measurement accuracy a measuring instrument is developed for radial composite deviations of high-precision master gear in the paper. This instrument uses the structure of spring-suspend swing span to overcome the shortcomings of large rotation errors low sensitivity low resolution and large measuring force appearing in the traditional combination-type gear inspection instrument. Artificial intelligence technology is used to improve the efficiency and accuracy of this instrument. The result is that the measuring apparatus is able to meet the requirement and improve efficiency through the measuring experiments on master gears of precision grade 2 with modulus 2 mm and 3 mm respectively. 2010 SPIE.

A new method of measuring lead screw with dual-frequency laser interference (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
作者: Qi X.-D.

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A new optical structure of measuring lead screw with dual-frequency laser interferometer is proposed and a formula used quickly correcting Abbe error is deduced in this paper. In the process of testing lead screw Abbe error in the measured data can be real time compensated so that the measurement system which doesn't meet Abbe principle can achieve high measurement accuracy. In addition this method can also eliminate measurement error induced by axial movement of the measured lead screw. The experimental result shows that of the maximum residual error is only 0.48m within 300mm stroke after the maximum Abbe error 1.39m is corrected. This method effectively improves the measurement accuracy of lead screw. 2010 IEEE.

Phase-laser ranging system based on digital signal processing for optoelectronics theodolite application (EI CONFERENCE) 会议论文 OAI收割
2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010, August 20, 2010 - August 22, 2010, Chengdu, China
作者: Liu Y.-S.

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In order to meet requirement of high accurate ranging the laser ranging system is designed for optoelectronics theodolite application by this paper based on digital signal processing. Variable modulating method is used to solve the antinomy between the measuring range and accuracy. Frequency mixing is adopted to reduce the frequency of the signal which can lower the requirement for hardware. The high ranging accuracy is achieved by way of Fast Fourior Transform (FFT) using digital signal processor and error correcting factor. Experiment results indicate that using digital signal processing method can reduce the influence of surroundings and hardware system and obtain high ranging accuracy. 2010 IEEE.

Design and tolerance analysis of compensator for high order aspheric surface testing (EI CONFERENCE) 会议论文 OAI收割
2009 International Conference on Optical Instruments and Technology - Optoelectronic Measurement Technology and Systems, October 19, 2009 - October 22, 2009, Shanghai, China
作者: Chen X.; Liu W.; Chen X.; Chen X.

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High accuracy is required in surface testing of 90nm nodal point lithography projecting lens. By comparing various aspheric surface testing methods the structure layout of the compensator is a meniscus positive lens combined with a Plano-convex positive lens. The design results indicate that: primary and high order aberrations are balanced well we adopt Offner null compensator to test the aspheric surface in the point diffraction interferometer at last. In this paper MTF exceeds diffraction limit an Offner compensator is presented on the base of the third order aberration theory to test concave aspheric surface root-mean-square (RMS) of wave front error /167. The F-number of the system can achieve F/1.64. By the analysis of the process of aspheric surface testing with the designed system the optical construction parameters of which is determined by introducing equal-quantities spherical aberration to compensate all orders of aspheric coefficients. The field of view of the system is 0.02 a loosen distribution of the tolerance was presented based on the accuracy of measuring apparatus. 2009 SPIE.

Angular rate of test table based on high-speed non-contact measurement (EI CONFERENCE) 会议论文 OAI收割
9th International Conference on Electronic Measurement and Instruments, ICEMI 2009, August 16, 2009 - August 19, 2009, Beijing, China
作者: Yang L.; Zhao Y.; Zhao Y.; Zhao Y.; Yang L.

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This article will introduces a high-speed non-contact method that can measures the angular rate of a test table though an objective perspective. This method adopts a collimator tube that can be measured as a target fixed to the test table and the target corresponds to the angular position of the test table. In the process of the table rotating the camera will to keep track of the objective at a high speed. Due to the high sampling frequency of the high-speed camera instantaneous angular rate of test table can be measured. With pixel subdivision technology its measuring accuracy can be up to 0.02 pixels. We use this methods measured a low-speed test table's angular rate and analyzed the data. The error analysis shows when the rate of the test table is 0.20/s the accuracy of the method can achieve 0.0220%. 2009 IEEE.

Research on method of measuring the time of remote explosion point (EI CONFERENCE) 会议论文 OAI收割
27th International Congress on High-Speed Photography and Photonics, September 17, 2006 - September 22, 2006, Xi'an, China
作者: Zhou J.; Fu Y.

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The time when the bomb explodes is one of the most important indexes to appraise the test. According to the principles concerned with explosion radiation the principle of measuring the time of remote explosion point and composition of measuring system is introduced. Use CCD to record the explosion radiation DSP to process and record the high-capacity high-speed video signals and convert the exploding process examined by floating amplifier into digital signals. Besides the article analyzes the composing and structural design of the log's optical system principle of electric control and floating amplifier dynamic range of the system power analysis of the incident light and how to improve the accuracy of measurement in great detail.