PIEZOELECTRIC ACCELEROMETER Russian patent published in 1997 - IPC

FIELD: measurement technology. SUBSTANCE: accelerometer has body, piezoelectric transducer and matching circuit arranged in body, preamplifier, recorder, and power supply source. Preamplifier is divided into two parts. One part is positioned in accelerometer body, and it has amplifying stage, while the other part of preamplifier is located outside body. It has matching resistor 7 and blocking capacitor 8. Matching circuit is made as bipolar transistor, and amplifying stage includes three resistors and field transistor 4 the gate of which is connected to first leads of resistors 2,3. Second leads of resistors are connected to piezoelectric transducer 1. Source of field transistor 4 is connected to first lead of resistor 5 and to collector of bipolar transistor 6. Second lead of resistor 5 is connected to second lead of resistor 3, piezoelectric transducer 1 and to common lead of power supply source and recorder through two-wire communication line. Source of field transistor 4 is connected to base of bipolar transistor 6 the emitter of which is connected to first lead of matching resistor 7 and to first least of blocking capacitor 8 through two-wire communication line. Second lead of blocking capacitor 8 is connected to recorder, and second lead of matching resistor 7 is connected to power supply source. EFFECT: higher measurement results. 1 dwg