| 摘要 |
<p>Two ultrasonic wave beams (11,12) of different frequencies are emitted into a body (1) under consideration from different locations on a surface of the body and a scattered wave beam (13) created at a scattering point (14) in the body by the interaction between the two ultrasonic wave beams is received. The emitting locations of the ultrasonic wave beams and the receiving location of the scattered wave beam are caused to scan. Thus, the stress distribution in the body is measured on the basis of the received outputs resulting from the scanning.</p> |
