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요약정보
基于电流激励信号的数字电导率传感器设计 / Design of a Digital Conductivity Sensor Based on Current Excitation Signal
Resource Type
Academic Journal
Authors
许文强
;
张春强
;
陈长春
;
XU Wenqiang
;
ZHANG Chunqiang
;
CHEN Changchun
Source
电工技术 / Electric Engineering
. (4):32-35
Subject
石墨四电极;电导率;How land电路;快速傅里叶变换
Language
Chinese
ISSN
1002-1388
Online Access
Find it @ DONGA
초록
设计了一种基于电流激励信号的石墨四电极电导率数字传感器.微控制器的数模转换器DAC产生特定频率的正弦电压参考信号,该信号通过改进型How land电路转换成精密电流激励信号.采用石墨四电极电导率传感器配合高输入阻抗仪表运算放大器AD8220,极大程度减小了电极的激化效应,提高了测量精度.在电流激励输出端和仪表运算放大器输入端增设限流电阻和超低漏二极管,有效避免了外界电气过应力对电子元器件的损害.应用快速傅里叶变换FFT技术计算激励响应的幅值信号,提高测量精度和抗干扰能力.
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