| 摘要 |
PURPOSE:To facilitate maturity judging work and to enhance the S/N ratio of an impact sound signal. CONSTITUTION:When a maturity state is judged, it is judged whether the impact generation state to an object 1 to be inspected is proper by an angle detection part 19 and, only when the impact generation state is judged to be proper, maturity is judged by the control with a judgment control part 21. Since a pedestal 13 and an impact sphere 16a applying an impact to the object 14 to be inspected are separated so that no vibration is propagated, the vibration caused by an impact is not transmitted to the pedestal 13 when an impact is applied to the object 14 to be inspected and, therefore, only a vibration sound on which no noise is superposed is taken in by a microphone 17. As a result, maturity judging work is facilitated and the S/N ratio of an impact sound signal is enhanced and maturity can be easily judged. |
