Unifying Converters of Inductive Sensors Parameters for Devices Measuring the Parameters of Electrophysical Properties of Substances

Abstract

Inductive sensors can be used in devices for measuring the composition of liquid media, the moisture content of bulk and solid materials, while they provide several advantages over the more common conductometric sensors, for example, they allow more accurate measurements of moving materials or ampoules of aggressive and toxic environments. Inductive sensors are less widely used due to the complexity of the design and the appearance of resonant effects in combination with the capacity of inductive sensors. The article discusses: equivalent circuits of inductive sensors represented by a multi-element equivalent circuit; options for constructing unifying single and multichannel converters of electrophysical properties parameters of substances based on an inductive sensor, their construction features, drawbacks, errors, the choice of an informative parameter, ways to increase the invariance of measurements. To process the obtained analog results from the outputs of the unifying converters, it is proposed to use digital post-processing in the microcontroller. This construction simplifies the scheme and allows you to create stand-alone mobile devices without the use of processing measurement results on a personal computer and without the use of specialized expensive software. The advantages of such a construction are its wide functionality and correction of additional errors.