Abstract
This article focuses on the design of signal pre-processing circuit for low-power vortex flow meter. Firstly, both signal and noise of piezoelectric sensors for vortex flow meter are studied, and a conclusion is made through experiments that the main source of noise is from piezoelectric crystal natural oscillation. Then the parameters of the charge amplifier are analyzed by parametric analysis to get an understanding of their effects on its gain. And a programmable amplifier is designed to solve the problem of high range amplitude vortex signal for high turndown ratio. At last, a low pass filter and a pulse shaping circuit are presented. The results of experiment show that the circuit is able to expand measurement range, enlarge measurement ratio and also meet the low-power requirements.
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