Permeability testing technology is a kind of nondestructive testing method, which can test the stress concentration state and the degree of fatigue damage of ferromagnetic specimens based on the change of permeability, as well as realize the effective evaluation for the residual lifetime of the components. According to the principle of permeability measurement, a highly sensitive detection sensor was designed for the rod-shaped member. The influence of the diameter of detection coil and the number of turns and excitation voltage on optimum frequency and detection resolution was researched. It was found that the optimum frequency of excitation reduced with the increase in the coil diameter and the resolution of signal increased with coil diameter; The number of coil turns had nothing to do with the optimal frequency of incentive coils, but was related to the signal resolution; Excitation voltage had no effect on the optimum frequency, but had an impact on signal resolution. The research has an important contribution to the development of high sensitivity magnetic conductivity detector.%磁导率检测技术是一种依据磁导率的变化检测铁磁试件应力集中状态和疲劳损伤程度的无损检测方法,可实现对构件残余寿命的有效评价.依据磁导率检测原理,针对棒状待检构件设计研制一高灵敏检测传感器,考察检测线圈绕线直径、绕线线圈匝数、激励电压对最佳检测频率和检测分辨率的影响.研究发现,最佳激励频率随线径的增加而减少,信号分辨率随线径的增加而增加;绕线匝数与激励最佳频率无关,但与信号分辨率有关;激励电压对最佳频率的范围无影响,但对信号分辨力有影响.该研究结论对研制高灵敏度的磁导率检测仪具有重要意义.
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