基于电磁超声换能器的金属边缘厚度检测方法优化设计
Optimization Design of Metal Edge Thickness Detection Method based on Electromagnetic Ultrasonic Transducer
赵振勇 1蔺晓雪1
作者信息
- 1. 江西职业技术大学,江西 九江 332007
- 折叠
摘要
本文优化设计了一种金属边缘厚度检测方法,将电磁超声换能器(EMAT)置于试件边缘,激发横波和表面波,用来提高试件厚度检测精度.首先,建立有限元模型仿真横波和表面波在金属中的传播过程及第一次回波电压信号幅值.其次,通过超外差正交相敏检波系统对第一次回波电压信号进行相位分析.最后,为了验证边缘检测法的可行性,做了一系列实验,根据实验回波信号进行降噪处理,与理论厚度值相比较.结果表明,优化设计的边缘检测法能提高试件厚度检测精度,对厚度微小改变的试件的分辨率高,优于传统的时差法测厚技术.
Abstract
In this paper,a metal edge thickness detection method is optimized to place the electromagnetic ultrasonic transducer(EMAT)at the specimen edge to stimulate the shear wave and Rayleigh wave and improve the accuracy of the specimen thickness detection.First,a finite element model is established to simulate the propagation process of shear wave and Rayleigh wave in metal and the first echo voltage signal amplitude.Then,the first echo voltage signal is phase-analyzed by the superheterodyne orthogonal phase-sensitive detection system.Finally,in order to verify the feasibility of the edge detection method,a series of experiments were done for noise reduction according to the experimental echo signal,compared with the theoretical thickness value.The results show that the optimized edge detection method can improve the accuracy of the specimen thickness detection,and the resolution of the specimen with small thickness change is high,which is better than the traditional jet difference thickness measurement technique.
关键词
边缘检测/超外差相敏检波/电磁超声换能器/有限元分析Key words
edge detection/superheterodyne phase sensitive detection/electromagnetic ultrasonic transducer/finite element analysis引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据