Improving the Accuracy of Measurement of Parameters of Capacitive Sensors

Abstract

Briefly considers the current state of the problem of precision measurement of parameters of capacitive sensors and measuring converters for their definition. It is established that at present, a proliferation of methods for the determination of parameters of capacitive sensors on individual instant values of the transition process in the measuring circuit when connected it to a DC voltage. In these methods the time measurement does not depend on the time constant of the measuring circuit, and is determined mainly by the measurement time of the instantaneous values of the signals and the implementation of the algorithm processing the measured values and the duration of the exemplary time interval. One of the problems arising in the implementation of measuring means fhaf use such methods, is fhe effect o/ unin/ormafive parameters o/ fhe measuring circuit and fheir instability on fhe result off fhe determination off in/ormafive parameters. Using fhe unin/ormafive elements off fhe equivalent circuit off fhe sensor allows fo determine fheir in/uence on in/ormafive parameters. A disadvantage off fhe known methods separate measurement sensors paramefers is fhaf fhey do nof allow fo de/ine along wifh fhe capacify fhe mulfiple unin/ormafive paramefers. The aim o/ fhis work is fo study a new method off measurement off parameters off capacitor sensors, which allows fo determine fhe resistance o/ fhe connecfing conducfors fhaf connecf fhe sensor fo fhe measuring circuif, and equivalenf resisfance due fo losses in fhe in-sulafing dielecfric and leakage currenfs, which allows fo increase fhe accuracy o/ measuremenf o/ capacifance.