| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric type vibration sensor that has high sensibility to a vibration sound due to a fluid leakage of a synthetic resin pipe or large-diameter pipe, can increase the installation span, and hence allows efficient fluid leakage investigation, and to provide a leakage detection method using the vibration sensor.SOLUTION: The piezoelectric type vibration sensor 6 includes: a piezoelectric device 12 for converting a vibration sound into an electric signal; supporting means 13 for supporting one end of the piezoelectric device 12; a spindle 16 for loading a load on the other end of the piezoelectric device 12. The distance between the support position of the piezoelectric device 12 by the supporting means 13 and a load position of the spindle 16 is mechanically variable. Thus, the resonance frequency of the piezoelectric type vibration sensor 6 is variable. |
