Electronic measuring circuit for vibration measurements with a piezoelectric acceleration sensor

摘要

An electronic measuring circuit comprising a piezoelectric acceleration sensor (1) and a subsequent charge-voltage converter (2) having a two-wire output line (3, 4) connected to a DC source (5) for supply or supply, the charge voltage converter (2) including an operational amplifier (6) having an inverting input terminal (8) and a non-inverting input terminal (7) connected to the sensor outputs (9, 18), wherein the output terminal (10) of the operational amplifier (6) via a parallel circuit of a feedback capacitor (11) and a resistor network consisting of feedback resistor (12) and the voltage divider consisting of a second resistor (24) and a third resistor (25) with the inverting input terminal (8) of the operational amplifier (6) is connected, wherein the non-inverting input terminal (7) via a first voltage limiting element (13) with the first output line (3) and via a first resistor (23) to the second output line (4) and the output terminal (10) of the operational amplifier (6) in addition to a second voltage limiting element (14) and with the second output line (4) is connected.