INSPECTION COIL FOR ELECTROMAGNETIC INDUCTION FLAW DETECTION AND FLAW DETECTING METHOD

摘要

PURPOSE: To provide an electromagnetic induction flaw detecting method of an anisotropic conductive material (for example, carbon fiber reinforced plastics), etc., by using a rectangular inspection coil for selectively allowing an induction current to flow in a specific direction on a surface of a specimen. ;CONSTITUTION: A rectangular inspection coil 1 put on a surface of carbon fiber reinforced plastics 4 is connected to an induction current detector 5, the detector 5 allows an alternating current to flow to the inspection coil 1 and therewith converts an impedance change of the coil 1 into a voltage to output, and a recorder 6 records a voltage change. Therefore, where a longitudinal direction of the inspection coil 1 is superposed on the fiber direction (X direction) of 0° of the carbon fiber reinforced plastics 4, the flaw detection of a fiber rupture can be very accurately made, by selectively allowing an induction current to flow in the fiber direction (high conductance direction).;COPYRIGHT: (C)1995,JPO