| 摘要 |
<p>The non-destructive testing of solid bodies is conducted by generating transverse, ultrasonic surface waves in the solid body being inspected, said surface waves having sufficiently different frequencies such that they travel through the body being inspected at different depths; receiving at least a part of the reflected portion, if any, of the surface waves, the reflected portion consisting of at least two surfaces waves having sufficiently different frequencies such that these waves travelled at distinctly different depths through the solid body and filtering and measuring or analyzing the reflected portion of the surface waves to determine if a defect or discontinuity exists in the solid body and the depth or severity of the defect or discontinuity. The apparatus for conducting said non-destructive testing comprises a means for generating the ultrasonic surface waves; a means for receiving at least a part of the reflected portion, if any, of the surface waves and a detector means for measuring or analyzing the reflected portion of the surface wave.</p> |
