摘要
研制了高精度手持式电磁超声测厚仪。根据电磁超声回波峰值出现时刻不规律的特点,采用了基于首个周波检测的电磁超声测厚方法。设计了基于FPGA的大功率发射电路和低噪声接收电路,实现了超声波发射和低噪声接收;设计了基于ARM处理器的嵌入式Linux软件,实现了厚度计算、波形显示、参数设置、厚度-距离曲线等功能。利用该测厚仪对不同厚度的铝合金标准试块和钢板进行测厚实验。实验结果表明,该测厚仪分辨力达到0.01 mm,测量厚度可精确到0.001 mm。
A high accuracy hand-held thickness gauge with electromagnetic acoustic transducer was developed. The arrival time of electromagnetic ultrasonic echo peak is irregular,so the method based on the first cycle was adopted. High-power transmitter circuit and low-noise receiver circuit were designed by FPGA,implementing ultrasonic emission and low-noise receiver. An embedded Linux software was developed to realize user interface by ARM such as thickness calculate,waveform display,parameter settings,thickness-distance curve and so on. Experimental results show that the discreteness of the digital reference of the thickness gauge is 0. 001 mm and resolution reaches 0. 01 mm.
出处
《仪表技术与传感器》
CSCD
北大核心
2016年第5期32-34,共3页
Instrument Technique and Sensor
关键词
高精度
手持式
电磁超声
测厚
high-accuracy
hand-held
EMAT
thickness gauge
作者简介
李永虔（1991-），硕士研究生，主要从事电磁超声无损检测技术研究。E—mail：ngslyq@126．com
