基于ZYNQ的涡流无损检测系统的设计

Design of Eddy Current Nondestructive Testing System Based on ZYNQ

摘要:

涡流无损检测技术是以电磁理论为基础的非接触式的检测技术，具有结构简单、不受介质影响、抗干扰能力强等优点。本文设计了一种基于Zynq-7020平台的可变频的检测系统。Zynq-7020为片上系统，该平台既能发挥FPGA并行运算的优势，同时具备了处理系统的灵活性，能够实现对数据的高速采集和实时处理。通过上位机可以改变激励信号的频率，适应不同厚度金属的检测。该系统从数字信号处理角度实现阻抗分解，能够显著的提取缺陷信号。并通过实验验证了系统的可行性。

Abstract:

Eddy current nondestructive testing technology is a non-contact testing technology based on electromagnetic theory, which has the advantages of simple structure, no medium influence, strong anti-interference ability and so on. This paper designs a variable frequency detection system based on zynq-7020 platform. Zynq-7020 is a system on chip. The platform can not only give full play to the advantages of FPGA parallel computing, but also has the flexibility of processing system, which can realize high-speed data acquisition and real-time processing. The frequency of the excitation signal can be changed by the upper computer to adapt to the detection of metal with different thickness. The system realizes impedance decomposition from the perspective of digital signal processing, and can significantly extract the defect signal. The feasibility of the system is verified by experiments.