基于DSP的声压与振动数据采集系统的设计

Design of Data Acquisition System Based on DSP for Acoustic Pressure and Vibration

摘要:

针对传统数据采集系统功能单一,抗干扰能力差,精度低,内存小,速度慢无法处理大量数据的问题,设计了一款基于DSP处理器的声压与振动数据采集系统；仪器内置的FPGA保障了高速数据采集,DSP处理器和大容量DDR2存储器使得系统可以不依赖上位机而直接在设备底层进行FFT计算,以太网接口有效地提高了数据传输的安全性和可靠性；环境试验结果显示该系统性能稳定,适用于如高温、低温、盐雾、高冲击等恶劣环境下的数据采集,可以满足声压和振动信号的采样和分析要求。

Abstract:

In view of the deficiencies such as single functionality, poor anti-interference ability, low precision, small memory space and low speed of traditional data acquisition systems, a DSP-based data acquisition system for acoustic pressure and vibration was developed to cope with this problem. A built-in FPGA inside the instrument ensured the high-speed data acquisition, and the combination of DSP and DDR2 made the system can get efficient FFT computation from the embedded software rather than the program running on the remote host. Furthermore, the Ethernet protocol greatly improved the reliability and safety during data transfer progress. The result of environment test showed that the data acquisition system had a stable performance and was especially suitable for the applications in severe conditions such as high temperature, low temperature, sharp shock, salt spray environment, and completely met the requirements of sampling and analyzing acoustic pressure and vibration signals.