Invariant transducers of capacitive sensor parameters into voltage
Marta Herasym, Yevhen Pokhodylo · Eastern-European Journal of Enterprise Technologies · 2014
This paper presents the importance of capacitive primary transdusers, by which the electrical parameters of products of nonelectric nature are monitored. The main objective is to provide a result invariance to the near-electrode impedance, as uninformative parameter and to provide a proper measurement mode. Different variants of construction of invariant transducers with four-electrode contact sensors, that realize the method of direct transformation “impedancevoltage” are considered. The electrical and mathematical models of sensors of a given current mode and given preset voltage are shown.By these transducers we can provide result invariance to the capacity of a double layer and to parameters of a test signal. Results can be used for designing the devices of monitoring the parameters of products quality by reactive and active components of admittance within the audiofrequency range simultaneously providing an appropriate measurement mode