ZHAO Jin-chuang, WANG Yi, FU Wen-li, et al. Anti-interference method for capacitance measuring circuit based on large scale sensor[J]. 2016, 35(8): 24-26+29.
ZHAO Jin-chuang, WANG Yi, FU Wen-li, et al. Anti-interference method for capacitance measuring circuit based on large scale sensor[J]. 2016, 35(8): 24-26+29. DOI: 10.13873/J.1000-9787(2016)08-0024-03.
In order to suppress strong measuring interferences in measuring circuit of electrical capacitance tomography( ECT) system based on large-scale sensor
on the basis of analysis on stray capacitance interferences produced by single shield coaxial cables and analog switches
stray-immune measuring circuit using cable-driven technology and double-T-switch array is designed to suppress stray capacitance interferences. Meanwhile
in order to improve output signal-to-noise( SNR) ratio of the measuring circuit
2-electrode excitation strategy is employed to enhance the sensitivity in the sensor. Experimental results show that output SNR of the proposed measuring circuit is 56. 8 d B and the standard deviation of the measured value in 10 h is 0. 132 f F. The proposed measuring circuit has good stray-immune ability
high output SNR and good stability.
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Design of electrical capacitance tomography sensors This article is based on ’Key issues in designing capacitance tomography sensors’ by the same author, which appeared in Proc. 5th IEEE Conference on Sensors , doi:10.1109/ICSENS.2007.355515 . ? 2006 IEEE. [J] . Wuqiang Yang. Measurement Science and Technology . 2010 (4)