Low-cost, high-precision measurement system for capacitive sensors

被引：38
|
作者：
Kolle, C
O'Leary, P
机构：
[1] Joanneum Res, Inst Chem & Opt Sensors, A-8010 Graz, Austria
[2] Univ Min & Met Leoben, Inst Automat, A-8700 Leoben, Austria
[3] Christian Doppler Lab Sensor Messtech, A-8700 Leoben, Austria
来源：
MEASUREMENT SCIENCE AND TECHNOLOGY | 1998年 / 9卷 / 03期
关键词：
D O I：
10.1088/0957-0233/9/3/028
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This paper describes a low-cost realization of a precision capacitance measurement instrument. The method is based on synchronous modulation and demodulation operating at a frequency of 100 kHz. A two-channel multiplying digital-to-analogue converter is used to generate a sinusoidal drive voltage and to perform multiplication with the demodulation signal. The modulation and demodulation signals are generated using a direct digital synthesizer, which is implemented using a field programmable gate array. Experimental results show a reproducibility of better than +/-0.005% in the range from 50 pF to 600 pF.
引用
收藏
页码：510 / 517
页数：8
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