基于自适应采样频率与AD7606的振动信号采集方法

Method of Vibration Signal Collection Based on Adaptive Sampling Frequency and AD7606

针对工业上的高精度振动信号采集需求,提出了一种使用锁相环倍频电路自动控制AD7606采样频率的3 kHz超高速振动信号采集方法;实现了无论振动频率如何变化,采样频率都会因为锁相环的作用而始终保持为振动频率的固定倍数;STM32F407通过捕获机械设备的旋转光电脉冲信号计算振动频率并通过并口完成与AD7606的数据传输;信号采集完成后,STM32F407使用离散傅里叶变换计算振动信号的幅值和相角并通过串口将数据传输给上位机。实验表明,该方法可以实现超高速旋转设备振动信号的高精度采集。

In view of the demand of high precision vibration signal acquisition in the industrial, a new ultra high speed vibration signal collection method for 3000Hz frequency using phase locked loop frequency multiplication circuit to automatically control the AD7606 sampling frequency was put forward. No matter how the frequency of vibration is changed, the sampling frequency was always kept as a fixed multiple of the vibration frequency because of the function of the phase locked loop. STM32F407 calculated the vibration frequency by capturing the rotating photoelectric pulse signal of mechanical equipment and data was transmitted with AD7606 through the parallel port. STM32F407 calculate the amplitude and phase of vibration signal using DFT after signal acquisition complete, and data was transmitted to the host computer through the serial port. Experimental results show that the method can achieve high precision acquisition of vibration signal of uhra high speed rotating equipment.