|Table of Contents|

Signal processing circuit based on ADA2200 in switch-capacitancemicro-displacement sensor(PDF)

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2018年06期
Page:
693-
Research Field:
Publishing date:

Info

Title:
Signal processing circuit based on ADA2200 in switch-capacitancemicro-displacement sensor
Author(s):
Lin Tianyi1Li Wusen1Chen Wenjian1Qi Yongjun2Zheng Nan1Xiao Yue1
1.School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China; 2. National Astronomical Observatories,Nanjing Institute of AstronomicalOptical Technology,Nanjing 210042,China
Keywords:
active optics switched capacitances micro-displacement sensors astronomical telescopes capacitance detection synchronous demodulation sampling analog technology
PACS:
TP212.1
DOI:
10.14177/j.cnki.32-1397n.2018.42.06.009
Abstract:
The signal processing circuit of a micro-displacement sensor is researched to get rid of the noise and realize the precise measurement of the micro-displacement between two segments of an astronomical telescope. Main circuit modules are designed using a detector with drive based on switched capacitors and the displacement signal demodulation method based on ADA2200. The capacitance detection module combines the switched capacitance technology and a capacitance/voltage converter. The synchronous demodulation module adopts ADA2200 chip to realize synchronous orthogonal demodulation of signals based on sampling analog technology(SAT). Experimental results show that the micro-displacement between the capacitors’plates can be detected,the demodulation based on ADA2200 chip can realize precision better than 2.5%,and the dynamics displacement can be demodulated in real time.

References:

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Last Update: 2018-12-30