基于FPGA的带包覆层管道脉冲涡流在役检测系统设计  

Design of Pulsed Eddy Current In-service Detecting System for Cladding Pipelines Based on FPGA

作　　者：黄文丰 杨帆 付跃文[1] 李朝阳 HUANG Wenfeng;YANG Fan;FU Yuewen;LI Zhaoyang(Ministry of Education Key Laboratory of Nondestructive Testing,Nanchang Hangkong University,Nanchang 330063,China;Foshan Metro Operation Co.,Ltd.,Foshan 528000,China)

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室,南昌330063 [2]佛山市地铁运营有限公司,佛山528000

出　　处：《自动化与仪表》2023年第7期73-78,共6页Automation & Instrumentation

基　　金：国家自然科学基金资助项目(52067016)。

摘　　要：脉冲涡流检测技术可在不拆除包覆层的条件下对管道腐蚀缺陷进行在役检测,但目前的检测技术信号处理速度较慢,导致整个检测速度较慢。为了提高检测系统的检测效率,使用FPGA作为主控芯片,该文设计了一款便携式脉冲涡流在役检测系统,对带包覆层管道检测信号进行处理,识别出管道局部腐蚀缺陷,显著提高了计算效率从而提高了检测速度。系统在Xilinx FPGA平台上使用Savitzky-Golay卷积平滑算法实现对脉冲涡流检测信号平滑滤波处理,比较信号斜率识别出管道局部腐蚀缺陷,计算速度比直接利用PC机进行计算提高了120倍,从而提高了检测速度,并且系统可便利地进行多传感器扩展。The pulsed eddy current testing technology can detect pipeline corrosion defects in service without removing the cladding,but the low signal processing speed results in a slow detection speed.In order to improve the detection efficiency,a portable pulsed eddy current in-service detection system is designed using FPGA as the main control chip,which processes the detection signal of the cladding pipeline,identifies the local corrosion defects of the pipeline,significantly improves the calculation efficiency and improves the detection speed.The system uses the Savitzky-Golay convolution smoothing algorithm on the Xilinx FPGA to smooth and filter the pulse eddy current testing signal,identify the local corrosion defects of the pipeline by comparing the signal slope.The computation speed is 120 times higher than that of the calculation using a PC,thus improving the detection speed.And the system can easily expand multi-sensor.

关 键 词：脉冲涡流 现场可编程门阵列 Savitzky-Golay平滑算法 在役检测 

分 类 号：TG115.28[金属学及工艺—物理冶金]