Development of Wireless and Automatic Crawling Instrument Based on Magnetic Flux Leakage Technique
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摘要: 根据压力容器、压力管道和大型常压储罐长周期运行不停机检测的迫切需求，基于漏磁检测原理，并采用无线遥控电机驱动、可调节可浮动传感器、基于无线局域网的数据传输与通讯等先进技术，研制了无线自动爬行漏磁检测仪。该检测仪可对铁磁性管状或板状构件的腐蚀等缺陷进行有效的检测与评估。仪器主要由驱动模块、传感模块、信号处理模块、位置记录装置及信号采集与分析软件组成。经测试及现场应用证明，该仪器可检测出8 mm厚板或管试件上ø1.6 mm的通孔和ø10 mm×20%壁厚的球形孔缺陷，具有较高的检测灵敏度。Abstract: Due to the urgent need of long-periodic safe running and in-service testing for pressure vessel, pressure piping and large-scale atmospheric tank, the wireless and automatic crawling instrument has been developed based on the principle of magnetic flux leakage testing technique. Some advanced technology such as wireless remote control, adjustable and floating sensor, and wireless local area network (WLAN) data transmission and communication have been utilized in this instrument. The equipment is mainly composed of drive module, sensor module, signal processing module, device of recording signal positions and signal acquisition and analysis software. It can make effective detection and assessment about corrosion defects for ferromagnetic specimens. The instrument has a high detection sensitivity through testing and field application. It can detect man-made defects of ø1.6 mm hole and ø10 mm×20% thickness spherical pit for pipes and plate specimens with 8mm thickness.
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