| 摘要 |
PURPOSE:To prevent a vertical ultrasonic wave from being generated in a material to be inspected and to form a flaw detector with a good S/N by providing an ultrasonic wave absorber at a specific position on the surface where the wedge of a probe contacts an acoustic coupler. CONSTITUTION:The ultrasonic wave absorber 9 made of an elastic body is provided over the entire surface which is the surface behind the point where the sound pressure is maximum on the surface where the plastic wedge 3 of the ultrasonic probe 1 contacts the acoustic coupler 4 and <=-10dB in sound pressure from the point where the sound pressure is maximum. The main lobe of the strong sound pressure is propagated to the surface of the material 7 to be inspected, but the side lobe 6 of small sound pressure is absorbed and attenuated by the absorber 9. Consequently, the vertical ultrasonic wave is prevented in the material to be inspected and any echo which becomes a noise component is not generated in a flaw detection gate 8, so the probe with the good S/N is obtained.
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