基于隧道磁阻（TMR)效应的笔式漏磁探伤仪研制

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中图分类号：TQ178 文献标志码：A文章编号：1001-5922（2025）09-0169-04

Development of a pen-type magnetic flux leakage flaw detector based on Tunnel Magnetoresistance （TMR） effect

PANYingfeng1，CHENG Xiang1，JIN Shashal，LI Xiaolong1，ZHANG Hai 1 WU Jifa’ ，WU Zhongxingl ，ZHAO Bowen²，ZHANG Shaochun² ，SU Shuai² （1.Anhui Xinli Electric Power Technology Consulting Co.，Ltd.，Hefei 230601，China ; 2.Anhui Guosheng Quantum Technology Co.，Ltd.，Hefei 23Oo88，China）

Abstract：Fordetection objects likenarow slitsand slender weldsof largeand medium-sized instrumentsand equipment that are hard to reach closely in non-destructive testing scenarios，a portable，handheld small pen-type magnetic flux leakage flaw detector based on Tunnel Magnetoresistance（TMR）efect has been developed.The dimensions of the device are 150mm×20mm×7 mm，and it can be used for supplementary detection of conventional non-destructive testing equipment.The hardware circuit，firmware program，and upper computer software of the pentype magnetic flux leakage flaw detector were developedand designed.The hardware circuit flteredand noise-reduced theoutput signal from the TMRchipand transmitted ittoa microcontroller after converting ittosingle-ended format.The firmware program sampled the data，applied sliding average filtering，and uploaded it tothe upper computer.The upper computer software displayed the signal waveform.Experimental results showed that the resolution of the pen-type magnetic flux leakage flaw detector was 21.8mGs （ 1Hz ）and12.5μGs （ 10Hz ），the maximum lift - off value was 1.6mm ，thestatistical false detection rate was 0.532% ，and the statistical missed detection rate was 0.234% ：

Key words：Tunnel Magnetoresistance （TMR）;magnetic flux leakage detection;magnetic flux leakage flaw detector

现代工业的快速发展对材料和结构的安全性和可靠性提出了更高的要求，无损检测已经成为了工业制造中服役、退役设备的主要检测技术[1]。（剩余6563字）