针对现有的数据采集系统无法兼备通道数多、速度快、实时存储的问题,提出一种基于可编程逻辑器件和大容量Flash的多传感器动态参数实时采集与存储方法.该系统以FPGA为主控制器,实现对模数转换芯片的控制与读取时序;转换后添加校验字节,通过双FIFO缓存方式实现和Flash的高效率数据交互;双Flash实现采集数据备份,增加存储可靠性;双Flash之间总线相互独立,提高数据存储速度;最后通过USB接口实现与上位机的高速数据传递.实验证明:该系统的单通道采样速率可达2 MHz,实时存储速率单片Flash可达50 MByte/s字节,双片可达100 MByte/s,在强振动动态测试环境下,能够可靠地采集传感器的输出信号,采集绝对误差在1 mV以内,数据无误码率.满足振动测量的稳定可靠、精度高、抗干扰能力强等要求.
In order to solve the problems that the existing data acquisition system cannot have many channels, high speed and real-time storage at the same time, a real-time collection and storage method of multi-sensor dynamic parameters based on FPGA and large-capacity flash was proposed.The system took FPGA as the core processor to control and read the analog-to-digital conversion chip, added check bytes after the conversion, realized the high-efficiency data interaction with the flash through the double FIFO buffers, and used data back-up to increase storage reliability, then it took free-running interfaces between double flash to improve data storage speed.Finally, the core processor communicated with host computer by USB ports to achieve high-speed data transfer.The experimental results show that the acquisition-frequency of system can reach 2 MHz, the rate of real-time storage can come to 50 MByte/s with one Flash and 100 MByte/s with double Flash.Under the condition of strong vibration dynamic testing, this system can reliably collect the output signal from the sensor with the absolute error within 1 mV and without error rate, so it meets the requirements for stabilization, reliability, high precision and anti-interference ability.
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