DYNAMIC COMPENSATION AND SIMULATION

摘要

PURPOSE: To detect the crack of a wire, etc., moving at a high speed by eddy current flaw detection by processing signals from a plurality of converters. CONSTITUTION: At the time of performing flaw detection on an object 1 to be tested for detecting the crack 2 of the object 1, many converters G1 -Gn are put on different parts of the object 1 and switched in a converter supplying unit 3 one by one through a selector/distributor 5. The unit 3 supplies a constant current Ik having at least one frequency/carrier frequency to a converter concerned. The voltage across both ends of the converter concerned is measured and processed by means of a signal processing unit 4 by continuously advancing/ stepping the selector 5. When the crack 2 lies below the converter G2 the crack 2 can be detected, because the impedance of the converter G2 and also the voltage across both ends of the converter G2 change.