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中国材料大会2012

作者： Linlin Liu Tianli Zhang Heng Zhang Chengbao Jiang School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics

ISBN: (纸本)9783037856079

Giant magnetostrictive materials have a broad potential application in aviation and aerospace field owing to its good properties. The actuators made of the materials show excellent performance which makes them a good choice for precision positioning. This paper presents a micro-displacement positioning system of the giant magnetostrictive actuator （GMA）. The structure of the system and its control method are described. In order to achieve the steady micro-positioning characteristics, the adjustment process of the system based on the control algorithm of Programmable Multi-axis Controller （PMAC） was researched. The response time of the GMA was less than 1 ms which was shown in the step response curve. Relatively large displacement （5～20 μm） positioning and micro-displacement （0.9～3 μm） positioning were achieved with the average positioning systematical errors of less than 0.5 μm.

关键词： micro-displacement Positioning Giant magnetostrictive actuator (GMA) Programmable multi-axis controller (PMAC)

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Application of Wavelet Transform in Dual-differential Optical Fiber F-P Interferometric micro-displacement Measurement System

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Semiconductor Photonics and Technology 2005年第4期11卷 263-265页

作者： ZHANG Shu-qing YANG Feng-lu WANG Xue-qiang BAI Qin-yuan ZHANG Li-guo College of Electr. Eng. Yanshan University Qinghuangdao 066004 CHN

Based on dual-differential comparing principle, an experimental system of optical fiber F-P interferometric micro-displacement measurement is introduced. It is capable of achieving the absolute displacement measurement, and wavelet transforms is adopted as theory fundament to extract the optical F-P interferometric characteristic signal and remove the noise, so its resolution can reach 0. 01 μm in the dynamic range of 0～ 1 mm.

关键词： Optical fiber Fabry-Perot interferometer micro-displacement Dual differential Wavelet transform

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MODELING OF SCG ROTOR DRIFT AND MEASURING SCHEME

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Transactions of Nanjing University of Aeronautics and Astronautics 2007年第1期24卷 17-24页

作者：汤继强房建成张延顺北京航空航天大学仪器科学与光电工程学院

Based on micro-displacement measurement principles of the spherical differential capacitance sensor, the relationship between the capacitance variation and the micro-displacement of each pair of detecting electrodes for the superconducting gyroscope （SCG） with eight detecting electrodes is analyzed. The model of the SCG rotor drift is established through dimensionless processing, linearization within micro-displacement and the least-square approach. Both the measurement scheme of the SCG rotor drift based on the model and its parameter relationship are presented. To guarantee the potential of the suspension rotor to be zero, the distributing scheme of four pairs of detecting electrodes is presented. The scheme can measure the magnitude and the direction of the rotor drift. The negative factors for affecting the measurement precision of .the SCG rotor drift and simulation results of the total effects are given. Simulation results show that the distributing capacitance of these differential capacitance sensors, the zero potential of the rotor and the model error are the major negative factors. The methods for eliminating those negative factors and the application range of the model are given. The model ensures the relationship between the output voltage and the rotor drift be linear.

关键词： superconducting gyroscope suspension rotor drift spherical differential capacitance micro-displacement

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Highly sensitive and fast response strain sensor based on evanescently coupled micro/nanofibers

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Opto-Electronic Advances 2022年第9期5卷 34-42页

作者： Wen Yu Ni Yao Jing Pan Wei Fang Xiong Li Limin Tong Lei Zhang State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Research Center for Intelligent Sensing Zhejiang LabHangzhou 311121China Tencent Robotics X Lab Tencent Technology(Shenzhen)Co.LtdShenzhen 518054China

Flexible strain sensors play an important role in electronic skins,wearable medical devices,and advanced ***,a highly sensitive and fast response optical strain sensor with two evanescently coupled optical micro/nanofibers(MNFs)embedded in a polydimethylsiloxane(PDMS)film is *** strain sensor exhibits a gauge factor as high as 64.5 for strain≤0.5%and a strain resolution of 0.0012%which corresponds to elongation of 120 nm on a 1 cm long *** a proof-of-concept,highly sensitive fingertip pulse measurement is *** properties of fast temporal frequency response up to 30 kHz and a pressure sensitivity of 102 kPa^(−1) enable the sensor for sound *** versatile sensor could be of great use in physiological signal monitoring,voice recognition and micro-displacement detection.

关键词： optical micro/nanofiber strain sensor pressure sensor micro-displacement directional coupler

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