三角波激励ECT测量电路

doi:10.3969/j.issn.1000-1158.2020.11.16

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Abstract Electrical capacitance tomography measuring circuit requires extremely high sensitivity and dynamic range. The use of triangular-wave signal as excitation signal was proposed to replace the sine-wave signal. Due to the differential characteristics of C/V converter circuit, its output became square wave signal when triangular-wave signal was applied to the measured capacitance. At the same time, the circuit showed good linearity in measuring small capacitance. Transient analysis showed that the settling time was reduced to 0.65μs. In addition, the capacitance acquisition rate could be greatly increased by the removal of phase sensitive detector. For a 12-electrode ECT system, the frame rate could reach up to 3124 frames/s. Experimental results showed that the peak peak value of the measurement sensitivity of the circuit is 0.8 V/pF, and the dynamic range is 69 dB.

Key words： metrology electrical capacitance tomography triangle wave C/V converter

Received: 09 November 2018 Published: 02 November 2020

PACS:	TB971
	TB937

Fund:The National Natural Science Foundation of China

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	Articles by authors
	MA Min
	WU Ke
	HU Ya-feng
	CUI Zi-qiang
	WANG Hua-xiang

Cite this article:

MA Min,WU Ke,HU Ya-feng, et al. Triangular-wave Signal Driven Measuring Circuit in ECT[J]. Acta Metrologica Sinica, 2020, 41(11): 1410-1415.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2020.11.16 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2020/V41/I11/1410

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