METHOD AND DEVICE FOR DETECTING QUALITY OF CONTACT SURFACE

摘要

PROBLEM TO BE SOLVED: To simply and certainly detect the fine gap formed in a contact surface or the degree of the contact stress of the contact surface from outside of the contact surface. SOLUTION: A device includes an ultrasonic transmitter 2 for allowing a burst ultrasonic wave to enter the contact surface S of two members M1 and M2, an ultrasonic receiver 2 for receiving the ultrasonic wave reflected from the contact surface S and a computer 4 for analyzing the frequency of the receiving signal of the ultrasonic receiver 2 to calculate the value of the ratio (A2/A1) of the amplitude A1 of a fundamental wave and the amplitude A2 of a secondary higher harmonic. The presence of the fine gap in the contact surface S or the degree of the contact stress of the contact surface S can be detected from the ratio (A2/A1) of the amplitude A2 of the secondary higher harmonic produced in the contact surface S and the amplitude A1 of the fundamental wave reflected from the contact surface S. COPYRIGHT: (C)2006,JPO&NCIPI