Measuring and testing – With fluid pressure – Leakage
Patent
1989-01-20
1989-08-22
Noland, Tom
Measuring and testing
With fluid pressure
Leakage
73592, G01M 324
Patent
active
048584622
ABSTRACT:
A method and apparatus for locating a leak which produces a continuous acoustic emission having background noise and spikes, comprises continuously monitoring the acoustic emissions using spaced apart detectors which produce signals having background noise and spikes corresponding to those of the continuous acoustic emissions. The spikes of one signal are offset in time with respect to the spikes of the other signal, which corresponds to the difference in travel time of the acoustic signals to each of the detectors. By measuring the offset between the spikes, the relative position of the acoustic emission, and thus the relative position of the leak, can be determined with respect to the position of the detectors. To facilitate separating the spikes from the background noise, a floating detection threshold value is applied to the signals for eliminating the background noise.
REFERENCES:
patent: 4785659 (1988-11-01), Rose et al.
Coulter John E.
Evans Robert S.
Robertson Michael O.
Edwards Robert J.
Kalka Daniel S.
Matas Vytas R.
Noland Tom
Roskos Joseph W.
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