基于高分辨率模数转换器的振动信号采集系统设计

摘要

振动测量是了解工程机械工作状态的重要途径。为了实现振动信号采集需求，需设计一种基于高分辨率模数转换器和差分信号系统的数据采集系统方案。系统包含磁电式检波器、前置电路、高分辨率模数转换器和FPGA，可实现双通道同步数据采样，采样率可达53kSPS。同时以FPGA为控制单元，可以准确迅速的获得信号采样值，保证振动波形测量的准确性。经验证，该电路设计具有较好的实用性。%Vibration detection is an important way to monitor the status of mechanism. Acircuit based on high-resolution A/D converters and the differential signal processing system is introduced in this paper in order to meet the signal acquisition requirement of mechanical vibration.The system contains magneto-electric sensors, 24 bit A/D converter module and FPGA, which can accomplishtwo-channel synchronous data acquisition. FPGA is the main control unit. It will acquire the sample data quickly and precisely. The experiment shows that this circuit has strong practicability. It can be adopted to improve the accuracy of vibration detection.