CALIBRATION STANDARD FOR MEASURING SURFACE CRACKS BY ULTRASOUND AND METHOD

摘要

The invention consists in a method for calibrating and checking the calibration of an ultrasonic instrument for evaluating the depth of surface cracks on steel parts, by using a slotted pentagonal gaging block (2) as a support for the straight beam transducer (1) and surface wave (3 and 4) transducers, speeding-up the use of Rayleigh surface waves and rendering it feasible, either in laboratory or during infield use, for evaluating depth of cracks, independently of their location and angular position.