Time Division Multiplexing in Measurement Circuits of Multidimensional Objects

Technological solutions used in the design of sensors to reduce the influence of uninformative external influences have led to the need to consider sensor parametric transducers as multidimensional measurement objects, and therefore, to create measurement circuits for sensors with a multicomponent equivalent circuit for their parametric transducers. The paper considers variants of multicomponent equivalent circuits of capacitive sensors parametric transducers and mentions methods for converting equivalent circuits parameters. It is proposed to use phase division multiplexing in measuring circuits of multidimensional objects to determine the parameters of the sensor equivalent circuit. This method eliminates the error of converting passive electrical quantities into active ones. Approaches to determining the parameters of multidimensional objects using the method of phase division multiplexing based on the allocation of the active transducer output voltage harmonic components are considered. The implementation of the phase division multiplexing method in the microprocessor measuring circuit of a capacitive pressure sensor with temperature error correction is given. It is proposed to use piecewise continuous test signals to correct the error caused by imperfect sampling. The research was carried out using the methods of the classical electrical circuits theory and the error theory.