RESISTANT STRAIN GAUGE DEVICE Russian patent published in 2005 - IPC

FIELD: measurement technology.

SUBSTANCE: device can be used for measuring pressure, deformation and force. Device has four resistance strain gauges connected into bridge circuit, operational amplifier, two transistors connected into bridge circuit, two stabilizer diodes and resistors. Outputs of measuring diagonal of the bridge circuit are connected to inputs of operational amplifier through first and second resistors. Inputs of amplifier are in turn connected with first and second outputs of fifth resistors through third and fourth resistors. First output of sixth resistor is connected with anode of first stabilizer diode. Cathode of second stabilizing diode is connected with cathode of first stabilizer diode, with first output of power diagonal of bridge circuit, with second output of fifth resistor and first power output of operational amplifier. Anode of first stabilizing diode is connected to second output of power diagonal of bridge circuit, to base of first transistor and to anode of second stabilizing diode through sixth resistor, to second supply output of operational amplifier, collector of second transistor and first output of seventh resistor. Second output of seventh resistor is connected with collector of first transistor and base of second transistor. Emitter of first resistor is connected with output of operational amplifier. Emitter of second transistor is connected with first output terminal of the device which has second output terminal connected with first output of fifth resistor.

EFFECT: improved precision of measurement; simplified design.

2 dwg