METHOD AND SYSTEM OF PRESSURE AND TEMPERATURE MEASUREMENT BY STRAIN GAGE Russian patent published in 2018 - IPC G01K7/16 G01L1/22 

FIELD: measurement.

SUBSTANCE: invention relates to measuring equipment, in particular to measuring temperature and pressure. Method of measuring the pressure and temperature by a strain gage includes a supply of current to the diagonal of supplying the strain gage and measuring the voltage at the measuring diagonal U₊. When the direction of the current of the strain gauge supply is changed, the voltage U_- is measured. Unlike the prototype, the actual values of the temperature T and the pressure P are measured from the resistance R by calibration characteristics, the parameters of which are the temperature limit resistances R_T, pressure R_P and the corresponding limiting temperature T₀ and the pressure P_o, Calibration characteristics are constructed a priori from known samples with normalized measures of the upper and lower boundaries of the adaptive range T_i, P_i, where i=1, 2, and from the ratio of the actual values T, P of the calibration characteristics of the resistance against temperature and pressure, the volume V is calculated. In a pressure and temperature measuring system, a strain gauge system containing a standard bridge pressure sensor with strain gauges connected via a four- computing device, unlike the prototype, the inverter is included in the supply diagonal of the strain gage, the measuring diagonal of which is connected to the information inputs of the measuring and computing device, Control outputs of the latter are connected to the corresponding inputs of the DC inverter in bipolar pulses. In the proposed method, unlike the prototype, the actual values of temperature, pressure and volume are measured by calibration characteristics, that as a result does not exceed the methodical error of automatic measurement of climate characteristics (temperature, pressure and volume) 0.06% of a full-scale experiment.

EFFECT: technical result is automation of pressure, temperature and volume measurement due by using calibration characteristics, which minimize the methodical error to a minimum.

5 cl, 9 dwg