| 摘要 |
PURPOSE:To enable the detection of a gap or the like in a solid accurately and efficiently by utilizing a resonance phenomenon generated in a gap or the like due to the natural vibration of a solid to be measured. CONSTITUTION:A probe 2 of a transmitter 1 and a probe 8 of a receiver 7 are pressed on the surface of a solid S positioning inbetween an inspection point of the solid S to be measured. A vibrator 3 receives a non-response driving from an oscillator 6 and a wave therefrom is propagated through the solid S from the tip of the probe 2. Then, it reaches the probe 8 on the receiving side to be converted into an electrical signal with a vibrator 9 and the waveform thereof is observed with an oscilloscope 13 through a connector 10 and an amplifier 12. Here, if there is any hollow or a gap due to poor adhesion between difference materials in a solid S and when the vibration in a wave containing many fundamental frequencies coincides with the natural frequency of the gap K, a resonance phenomenon is caused in the gap K. Then, a wave of large amplitude is generated from the gap K and propagates through the solid S as shown by the arrow P to be transmitted through the vibrator 9 by way of the probe 8 of the receiver 7. This enable the detection of the gap and a poor adhesion point between differnet materials. |
