NONDESTRUCTIVE THICKNESS MEASURING METHOD AND NONDESTRUCTIVE ABNORMALITY DETECTING METHOD FOR SOLID DIELECTRIC SUBSTANCE

摘要

PURPOSE: To provide the thickness measuring method nondestructively measuring the thickness of a molded portion made of plastic, rubber, or paper of a solid dielectric substance, e.g. an electric wire, a cable connection section (joint section), or an insulator. ;CONSTITUTION: In the nondestructive thickness measuring method of a solid dielectric substance, DC voltage is applied to the solid dielectric substance to be measured by a high-voltage power source 24, dielectric charges are generated on the solid dielectric substance 10, then pulse voltage is applied by a pulse generator 25, and elastic waves are generated in the solid dielectric substance 10. The elastic waves are converted into the electric signal by a piezoelectric element 22 to obtain the signal wave-form, and the thickness of the solid dielectric substance 10 is determined from the signal wave-form.;COPYRIGHT: (C)1993,JPO&Japio