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Improvements in Speed and Resolution for the ACFM Technique

机译：ACFM技术的速度和分辨率的提高

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摘要

The AC Field Measurement Technique has been in use for over 20 years, almost exclusively targeting detection and sizing of fatigue cracks in welded steel structures by hand. For these applications, analog electronics are easily fast enough to cope with the amount of data involved. Also, for the defect sizes and test frequencies involved, simple coil sensors have enough resolution.Recently, there has been interest in extending the application of ACFM for high speed inspections using sensors mounted on trains or pipeline inspection PIGs. Also, the use of GMR sensors instead of coils is being studied to improve sensitivity to small and/or closely-spaced defects.This paper presents some results from research studies on inspection at 80 mph, and on detection of creep damage 0.004 in. deep.
机译：交流场测量技术已经使用了20多年，几乎专门针对手工检测和焊接钢结构中的疲劳裂纹。对于这些应用，模拟电子设备的速度足够快，足以应付所涉及的数据量。同样，对于所涉及的缺陷尺寸和测试频率，简单的线圈传感器具有足够的分辨率。最近，人们开始将ACFM的应用扩展到使用安装在火车或管道检查PIG上的传感器进行高速检查的应用中。另外，正在研究使用GMR传感器代替线圈来提高对小和/或间隔很近的缺陷的敏感性。本文介绍了在80 mph时的检测以及在0.004 in。深处检测蠕变损伤的研究结果。 。

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