基于FPGA的电容式声压传感器阵列信号采集存储系统

Signals Acquisition and Storage System of Capacitive Hydrophone Array Based on FPGA

针对水下声信号探测和电容式声压传感器阵列工程应用的需求,设计了一种应用于该传感器阵列的信号采集存储系统。该系统解决了实际应用中电容式声压传感器阵列输出信号无法直接检测、电容变化-电压变化转换精度低等问题。该系统以FPGA为控制核心实现该传感器阵列不同阵元的电路匹配,同时完成信号的预处理、采集及存储。系统测试过程中,采集并存储电容式声压传感器输出信号,并通过上位机对存储信号进行读取,测试结果表明:该系统在水下工作稳定,可正确记录水声信号。

According to the requirements for detecting underwater signals by capacitive hydrophone array in application,a kind of signal acquisition and storage system was designed.This system solved the problems that the output signals of capacitive hydrophone array can not be directly detected in practical application and the conversion precision of capacitance change to voltage change was low.This system took FPGA as a key component,was used to realize the circuit matching of different array elements,signal processing,acquisitionand storage,which were collected by capacitive hydrophone array.During the process of system debugging,signals of capacitive hydrophone array were collected and stored.By reading the storage signals through upper monitor,the result shows that this system works stably in underwater environment and is able to record underwater acoustic signals correctly.