| 摘要 |
The present invention provides an excellent method for detecting a leak hole, the method being advantageous in: that a leak hole can be surely detected when any fluid present in the outside of a tank is caused, by in-ternal decompression of the tank, to infiltrate into any fluid in the inside of the tank through the leak hole; that any leak hole present at any portion of the entire structure of a tank can be detected; and that the required testing time can be greatly shortened. The method comprises: (1) closing a mouth of a container containing a fluid, (2) adjusting at least one of the internal pressure and external pressure of the container so that the internal pressure of the container is lower than the external pressure of the container, and applying a reference ultrasonic signal having a predetermined phase to the fluid contained in the container, to thereby obtain a contained fluid ultrasonic signal, and (3) comparing the reference ultrasonic signal and the contained fluid ultrasonic signal with each other, wherein, when the contained fluid ultrasonic signal has a phase difference from the reference ultrasonic signal, and the phase difference continues to increase with the lapse of time, the container is judged to have a leak hole.
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