Detection system for leakage position

Abstract

Abstract PURPOSE:To detect a leakage position from the ratio of effective values by installing acoustic emission sensors at both ends of piping, and detecting the leakage of a liquid due to the increase in sensor output effective value. CONSTITUTION:AE sensors 2 and 3 are installed at both ends of piping 1, and their outputs are passed through effective value gauges 4 and 5 to obtain effective values VA and VB, and their ratio VA/VB is found by an arithmetic device 6. The output VA/VB for a leakage point is maximized at a point A, 1 at an intermediate point, and minimized at a point B. Its curve is different in shape according to the material, diameter, thickness, etc., of the piping, and calibration is performed previously to obtain only one curve. In general, the attenuation of a 100-300kHz AE sensor band by the piping is several dBs/m and the ratio of two sensor outputs is found to decide on a leakage point precisely without reference to the amount of leakage.

Inventors

• 👤 Yasuo Shinomiya
• 👤 四宮　康雄

Bibliographic Details