Research and implementation of conductivity measurement method based on SOPC
The traditional measurement method of conductivity of aqueous solution with electrode sensor ignores the capacitance effect in the conductivity cell,which leads to low measurement accuracy.To solve this problem,this paper proposes a conductivity measurement system based on SOPC,using frequency selective conductivity measurement method,and the hardware system uses SOPC system.This system is the core of the whole measurement system.The system also designs hardware circuits such as square wave excitation signal generator,signal amplification circuit and range switching circuit,which can not only reduce the influence of inter electrode resistance,but also eliminate the influence of lead capacitance on conductivity measurement.The test results show that the relative error of conductivity of the system can be less than 0.5％,and it also has the advantages of low cost,strong anti-interfer-ence ability and on-line upgrading,and has strong practical value.
SOPCconductivity measurementfrequency selection methodexcitation signal
万方数据
维普
