ELECTROMAGNETIC ACOUSTIC TRANSDUCER, AND DEVICE AND METHOD FOR DIAGNOSING MATERIAL DETERIORATION

摘要

PROBLEM TO BE SOLVED: To reduce cost of installing a material deterioration diagnostic device.SOLUTION: A material deterioration diagnostic device includes; a transducer 1 placed on a surface of a metallic material; an optical fiber placed on the surface of the metallic material; an optical interferometer which converts variation of light transmitting through the optical fiber corresponding to vibration in the metallic material into an electrical signal; and a measurement/control unit which computes thickness of the metallic material by using the electrical signal and determines a degree of deterioration of the metallic material. The transducer 1 includes an electrical coil 12 and magnets 11 which is provided on the electrical coil 12 and generates a magnetic field directed along the surface of the metallic material. The optical interferometer converts the variation of light transmitting through the optical fiber corresponding to the vibration generated by the transducer 1 into the electrical signal.