一种低频矢量水听器内嵌式电荷放大器

Embedded charge amplifier for low frequency vector hydrophone

针对压电式传感器输出阻抗高,需要放大器做好匹配,国外使用了IEPE传感器解决这一问题,但是国内很少将IEPE传感器应用于水听器的问题,本文设计了一种内置于水听器的电路,以达到低输出阻抗且两线制的目的,并开展了电路特性分析和硬件电路的制作,验证了电路传感器性能,得到了电路的放大倍数、幅频特性等数据。实验表明:该电路可以满足一般水听器2Hz~20kHz的使用范围,且内置电路具有两线制、输入阻抗高和输出阻抗低的优点,达到了电路小型化、测试系统简单化的目的,对水听器放大电路设计有参考意义。

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 fabrication 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 reference significance for the design of the hydrophone amplification circuit.