Abstract
A new method is proposed to detect a tilted planar and deflected flaws on the back surface of a plate using the interference of ultrasonic waves. Parameters for flaw evaluation are developed and examined through experimental results for artificial flaws. The effect of tilt and deflect angles (0°〜30°) of the flaw on parameter ΔΔ_<max>, which indicates the amount of asymmetry of the interference fringe along the direction normal to the flaw, is investigated.
