| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic leakage detector accurately detecting the directivity of ultrasonic microphones and accurately detecting the leakage position. SOLUTION: This ultrasonic leakage detector is provided with the ultrasonic microphones 6, 7 and 8 having directivity, a signal processing circuit 11 processing electrical signals detected by the ultrasonic microphones 6, 7, and 8, a display part 12 and a headphone 14 outputting the signals processed by the signal processing circuit 11, a light source 9 arranged in the center of the ultrasonic microphones 6, 7, and 8 and radiating an optical beam in the same direction as the directivity of the ultrasonic microphones 6, 7, and 8, and a probe 2, at least, having the ultrasonic microphones 6, 7, and 8, and the light source 9. A spot of the optical beam radiated from the light source 9 indicates the center of the directivity of the ultrasonic microphones 6, 7, and 8 relative to a facility to be measured so that the directivity of the ultrasonic microphones 6, 7, and 8 can be accurately detected to accurately detect the leakage position.
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