Abstract
Background The ability to process real-time measurement information, as well as the rapid development of computer facilities, opens new possibilities for the application and development of combined and joint measurement methods. There are known technical solutions for measuring pressure and temperature on the basis of a bridge strain-resistive sensor of the structure of the SOI. They realize the measurement of voltages on the measuring diagonal and the diagonal of the supply when the bridge circuit is powered by a current source. The determination of pressure and temperature is carried out by calculation, usually based on numerical methods. Tensoresistance sensors are available in various types, and each type is described by its mathematical model. Aims and Objectives The technique of research and development of two-channel information-measuring systems, linear mathematical models used for the study of the principle measurement of two-channel pressure and temperature measurement systems are considered in the article. The general condition of measurability is equivalent to the solvability of the system of equations describing the measuring channels. The implementation of one measuring channel is made by using different elements and different switching circuits. In this case, the models are written in the form of equations for the transformation of resistance of the strain gage into a voltage when the current is supplied. Possible variants are determined by search. In total, twenty-one possible versions of the implementation of a two-channel pressure and temperature measurement system have been identified. Results A study of the measurability of all variants of two-channel systems made it possible to establish that nineteen variants meet the condition of measurability, and two do not. A mathematical model is proposed that can be used to determine the optimal variant of a two-channel measuring system by the criterion of the minimum of the conditioning number.
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