Being manner in order to pinpoint the thickness of the formation (20) which in the part (17

摘要

The coil body (13) with the coil (14) with the part which the sensor which consists of should measure (17) it is positioned in the vicinity the part (17) the layer which consists of the conductive material (20) in the method in order to pinpoint thickness with non contact. This method has been based on the combination of induction and eddy current principle. The coil (14) 1st alternating current frequency f1 and 2nd alternating current frequency f2 is supplied and layer (20) can pinpoint thickness and by plural measurements and appraisal where the inductance change is appraised step. At that time the coil body (13), therefore and the coil (14) with the part (17) with distance the coil where 2nd alternating current frequency f2 is supplied (14) is guided from inductance value.