Time of Flight method for determining the size of cracks through Separations in Fluid filled structures.

摘要

A method and apparatus for determining the size of cracks, flat surface (8) connected through a full separation of gas or liquid (32).It emits Ultrasonic Energy, which has a Frequency equal to the Resonant frequency of the Separation, to the edge of the crack.A first portion of the energy is refracted back on the edge of crack, to the issuer (20), in a manner of detentionAnd a second portion is refracted by the Edge crack in a surface (18) is connected to the Rift, which reflects the second portion to a detector (30).The difference between the respective types of flight from the issuance to the detection of the first and second portions.Is measured and used to determine the penetration depth of the crack is connected with the surface.The Trajectories Displaced by the first and second portions of the Ultrasonic Energy emitted, Intersect substantially in separation.A similar method was also applied to determine the size of planar cracks Buried (8 '), through Openings filled with fluid.