基于SoC-FPGA的磁声发射信号采集系统设计与实现

Design and Implementation of Magnetoacoustic Emission Signal Acquisition System Based on SoC FPGA

针对磁声发射检测信号幅值较低,容易受噪声干扰这一问题,设计一种磁声发射信号采集系统。系统由以So C-FPGA为核心的下位机与上位机软件部分组成。对检测工件产生的磁声发射信号进行前置放大和衰减处理后,通过声发射传感器接收后转换为电平信号进行AD采集。利用主控芯片集成双核ARM和FPGA的构架,系统对采集后的数据进行FIR滤波及FFT频谱分析,并基于So C的设计框架实现信号在TFT屏幕的显示控制以及上位机的数据存储分析。测试结果表明,该系统对磁声发射信号有着高效稳定的采集处理能力,与未经过优化的原始信号比较,有效降低了检测过程中的噪声干扰。

Absrtact: To solve the problem that the amplitude of the magnetoacoustic emission(MAE) detection signal is low and easy to be interfered by noise, a MAE signal acquisition system is designed. The system is composed of lower computer and upper computer software with SoC FPGA as the core. After pre amplifying and attenuating the magnetoacoustic emission signal generated by the detected workpiece, it is converted into level signal for AD acquisition after being received by the acoustic emission sensor. Using the architecture of dual core ARM and FPGA integrated by the main control chip, the system performs FIR filtering and FFT spectrum analysis on the acquired data, and realizes the display control of the signal on the TFT screen and the data storage analysis of the upper computer based on the SoC design framework. The test results show that the system has a high efficient and stable acquisition and processing capability for the magnetoacoustic emission signal. Compared with the original signal without optimization, the noise interference in the detection process is effectively reduced.