BRIDGE-TYPE PRESSURE TRANSDUCER Russian patent published in 2020 - IPC G01L9/04 

FIELD: measurement.

SUBSTANCE: invention relates to measurement equipment and can be used for measurements of following physical values: pressure, acceleration, vibro-displacement, strain loads acting on elements of mechanisms. Proposed bridge-type strain gage, in which due to switching of resistive strain gauges of one of half-bridges of full strain-strain bridge and synchronous switching of two registers, in which information on measurement is stored in two adjacent half-periods of switching, temperature error is eliminated and there is no need to determine temperature of bridge. During resistance gauges switching sign of dependence of potential of middle point of switched half-bridge varies from measured value change. Sign of this potential does not depend on temperature change, this circumstance is used to exclude temperature error of "departure of initial unbalance" of strain bridge. Strain-bearing bridge is connected by input to stable current source, and by output to differential inputs of instrument amplifier, output voltage of amplifier is converted to digital form to ADC, output information of ADC is stored in two switched registers, information of which is compared in calculator, in comparison temperature error is excluded. ADC with registers can be replaced by two analogue storage devices (ASD), inputs connected to output of instrument amplifier, and outputs of which are compared on operational amplifier. Latter are also commutated synchronously with strain gauges of half-bridge.

EFFECT: technical result when implementing the disclosed solution is to eliminate the need for temperature calibration of the tensobridge to eliminate the temperature error of the "initial unbalance".

1 cl, 2 dwg