Embedded charge amplifier for low frequency vector hydrophone
Due to the high output impedance of piezoelectric sensors that require amplifiers to match well,IEPE sensors have been widely used to solve this problem;however,few IEPE sensors have been applied to hydrophones in China.In this study,we designed a circuit built into a hydrophone to achieve low output impedance and a two-wire system.To verify the performance of the circuit sensor,we conducted a circuit characteristic analysis and fab-rication of the hardware circuit,obtaining data such as the magnification and amplitude-frequency characteristics of the circuit.The experimental results show that the circuit can meet the application range of a general hydrophone from 2 Hz to 20 kHz,and the built-in circuit has the advantages of a two-wire system,high input impedance,and low output impedance.It achieves the purpose of miniaturizing the circuit and simplifying the test system,with ref-erence significance for the design of the hydrophone amplification circuit.
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