Abstract
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
Highlights
Electrophysical parameters monitoring of nonelectric products by means of primary capacitive transducers is much extended today
There are many various conductometric cells based on capacitive sensors of different engineering design for monitoring the parameters regarding electric conductivity [1]
Transducers of ”impedance-voltage” of nonelectrical nature objects can be used for designing the devices of monitoring the parameters of liquids quality by reactive and active components of complex conductivity within the audio-frequency range simultaneously providing the mode of preset voltage and given current
Summary
Electrophysical parameters monitoring of nonelectric products (granular materials, liquids) by means of primary capacitive transducers is much extended today. There are many various conductometric cells based on capacitive sensors of different engineering design for monitoring the parameters regarding electric conductivity [1]. There are mainly two-electrode and four-electrode capacitive sensors with the fixed constant of cell. They are used with appropriate measuring devices (conductometers) as well as with traditional meters of impedance and admittance parameters [2]. As an informative parameter of these sensors is the impedance of a cell with the monitored object, there is a problem of near-electrode effects. Impedance Zx – impedance of the monitored object
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