摘要
将不同厚度的金属薄板作为研究对象,设计并制作了一种带有高磁导率纯铁屏蔽罩的脉冲涡流传感器进行检测,从时域和频域上探究了传感器测得的差分电压与金属薄板厚度的变化关系。研究结果表明,在时域上,峰值和峰值时间随金属薄板厚度的增加而增大。在频域上,基频幅值与金属薄板厚度成线性关系,因而基频幅值更适合用于表征金属薄板厚度,且脉冲涡流的激励频率最好选择其基频对应的趋肤深度稍大于待测金属薄板最大厚度,可以在金属薄板测厚分析中得到应用。
The metal sheets of different thickness were used as research object.A pulsed eddy current sensor with a high magnetic permeability pure iron shield was designed and fabricated for testing.The relation between the difference voltage measured by the sensor and the thickness of the sheet metal was studied in time domain and frequency domain.The results show that in the time domain,both the peak and the time to peak increase with the thickness of the metal sheets.In the frequency domain,the fundamental frequency amplitude is linear with the thickness of the metal sheets.It is suggested that the fundamental frequency amplitude is more suitable for characterizing the thickness of thin metal sheets,and the excitation frequency of the pulsed eddy current is preferably selected that its skin depth is slightly larger than the maximum thickness of the metal sheet.This method can be applied in the thickness analysis of metal sheet measurement.
作者
赵桐
彭斌
ZHAO Tong;PENG Bin(University of Electronic Science and Technology of China,State Key Laboratory of Electronic Thin Films and Integrated Devices,Chengdu 611731,China)
出处
《仪表技术与传感器》
CSCD
北大核心
2020年第1期117-121,共5页
Instrument Technique and Sensor
关键词
脉冲涡流
差分电压
金属薄板厚度
基频幅值
线性化
激励频率
趋肤深度
eddy current
differential signal
thickness of metal sheet
fundamental frequency amplitude
linearization
excitation frequency
skin depth
