Development of TMR Sensors Array and Crack Detection System Based on ACFM Technology
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摘要: 隧道磁电阻(TMR)是近年来发展的一种高精度磁传感器, 在交流电磁场检测(ACFM)领域有很好的应用和发展前景。基于TMR传感器和交流电磁场检测技术, 采用宽U型激励, 设计了一种新型高精度阵列检测探头。借助TMR阵列探头, 搭建完整的ACFM系统, 开展了裂纹检测试验。试验结果表明, 使用该探头的ACFM检测系统具有较大的检测范围和较高的检测灵敏度, 在实现工件大面积检测的同时, 可有效防止漏检。Abstract: Tunneling Magnetic Resistance (TMR) is an emerging high precision magnetic sensor in recent years. TMR has become a promising magnetic sensor in nondestructive testing field. In this paper, a novel high precision TMR sensors array with wide U-shaped inducer based on ACFM technology is presented for cracks detection. The TMR sensors array and wide U-shaped inducer ACFM system were set up and cracks detection experiments were carried out. The results show that the wide U-shaped inducer induces a broad current field on the surface of specimen. The TMR sensors array and ACFM system can achieve high sensitivity and accurate detection of cracks on specimen. This system can conduct wide area detection and has a high efficiency.
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Keywords:
- TMR sensors array /
- Wide U-shaped inducer /
- Crack detection system
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