FM检测探头材料仿真分析与实验研究

In the Alternating Current Field Measurement (ACFM) inspection technique, the effeciency for detecting probe on signal extraction, most of which is weak and with electromagnetic interferential, becomes the foundation and key point to the crack recognition and quantification, while the amplitude of the crack signal and the probe sensitivity are directly affected by the probe material. In order to solve the mentioned problems, this paper mainly focuses on analysis of the materials used as ACFM detecting probe, and three frequently-used probe materials were comparatively studied based on simulation models and experiments. The results indicate that, defect signal with larger amplitude and better sensitivity was acquired, when Mn-Zn ferrite cores, with high magnetic conductivity, was used as the material for ACFM detecting probe.