PIEZOELECTRIC ACCELEROMETER Russian patent published in 2003 - IPC

FIELD: measurement technology, measurement of car acceleration. SUBSTANCE: piezoelectric accelerometer can find use in electronic control system of car. It has sensitive piezoelement, RC low- frequency filter, potential-setting resistor placed in parallel to capacitor of RC filter, operational amplifier connected to output of RC filter, reference voltage source which proper pole is connected to common lead-out of sensitive piezoelement, capacitor of RC filter and potential-setting resistor. Temperature-sensitive compensation capacitor is placed between corresponding leads-out of sensitive piezoelement and resistor of RC filter. Insertion of capacitor having practically zero temperature coefficient of capacitance makes it feasible to diminish relative measurement error caused by change of own capacitance of sensitive piezoelement in specified temperature range. EFFECT: simplified adjustment of accelerometer as sensitivity of electric circuit to spread of own capacitance of sensitive piezoelement falls. 1 cl, 1 dwg