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8 February 2019 The signal processing system of a differential capacitive micro-displacement sensor for the controlling of segmented mirror
Wusen Li, Yongjun Qi, Wenjian Chen
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Proceedings Volume 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging; 1084319 (2019) https://doi.org/10.1117/12.2506487
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China
Abstract
Checking of the micro-displacement between the segmented mirrors of the large aperture telescope is the foundation of the Active Optical System to adjust the system to gain the optimum observing effect. In this paper, the signal processing system of a new type of area-alterable differential capacitive micro-displacement sensor used in the active optical system was designed, including both the hardware and software of it. The hardware consists of the high performance instrument amplifier, the lock-in demodulator, Analog to Digital converter, FPGA and the microprocessor. The software includes the MCU codes and FPGA-based modules such as the excitation pulse generation, system control and implementation of the signal processing algorithms. On the basis of the EDA simulation and test of the circuit modules, the schematic and PCB layout were designed and the experimental setup was assembled. Then the codes of FPGA and Microprocessor were designed and debugged. In the end, the system was tested on the platform of the micro-displacement experiment. Results showed that the general design scheme is feasible although the precision of the system is needed to be improved.
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Wusen Li, Yongjun Qi, and Wenjian Chen "The signal processing system of a differential capacitive micro-displacement sensor for the controlling of segmented mirror", Proc. SPIE 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging, 1084319 (8 February 2019); https://doi.org/10.1117/12.2506487
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KEYWORDS
Sensors
Capacitors
Field programmable gate arrays
Signal processing
Amplifiers
Segmented mirrors
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