DETECTION OF FLUID LEAK POSITION

摘要

PURPOSE:To detect a leak position of fluid speedily and accurately by calculating an effective value of sound pressure in plural frequency ranges and also calculating the ratios of effective values of sound pressure of respective frequency ranges to that of the whole frequency range. CONSTITUTION:A leak signal detected by an AE (Acoustic Emission) sensor 1a is amplified 2a and 3a and inputted to an arithmetic unit 7 through band-pass filters 4aa-4ak, effective voltmeters 5aa-5ak, and A/D converters 6aa-6ak. The filter 4aa allows a signal detected almost over the entire frequency range of an AE signal of about 0.01-1MHz to pass and the obtained signal is processed 7 to calculate the standardized effective value of sound pressure in the whole frequency range. Other filters 4ab-4ak have frequency ranges obtained by dividing the whole frequency range into (k-1) sections and effective values of sound pressure in their respective ranges are calculated 7. Then, the ratios of effective values of sound pressure of respective ranges to that in the whole range are compared to calculate the distance from the AE sensor to the leak position.