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1·Comparison test and practical experience clearly showed, the defect detectibility of the fluorescent magnetic particle testing is far higher than the black magnetic particle testing.

对比试验与实践经验表明，荧光磁粉检测比黑色磁粉检测有高得多的缺陷检出率。

2·Eddy current, magnetic leak, magnetic particle and ultrasonic test are the main methods used for pumping rod test.

目前，对抽油杆的自动探伤主要有涡流、漏磁、磁粉及超声方法，各有其优缺点及适用范围。

3·It is solving these key problems that makes a new way for automatically distinguishing defects on test workpiece surface with magnetic particle inspection.

这些技术关键的解决，为实现试件缺陷的全自动辨识提供了依据和途径。