Measuring and testing – With fluid pressure – Leakage
Patent
1978-11-17
1979-12-04
Ruehl, Charles A.
Measuring and testing
With fluid pressure
Leakage
G01M 324
Patent
active
041765435
ABSTRACT:
Sonic type leak detector system for liquid storage tanks or the like. It uses a hydrophone to convert sonic waves in the liquid to electrical signals. The electrical signals are divided by two band pass filters. The division is into one band which contains any leak signals, and another band which contains only noise signals. Then both bands are blanked whenever the noise signal amplitude exceeds a predetermined amount. There is a differential amplifier that acts on the outputs of both band pass filters to amplify the difference after averaging of each, whenever signals are not blanked. And, there is an indicator to show when a leak is present. The indicator is actuated whenever the output of the differential amplifier exceeds a predetermined amplitude.
REFERENCES:
patent: 3028450 (1962-04-01), Manning
patent: 3462240 (1969-08-01), Bosselaar et al.
patent: 3838593 (1974-10-01), Thompson
Sabo, J. R., Detect Buried Steam Leaks With Acoustics, in Elec. World 186(1), p. 40, Jul. 1, 1976.
Brown Winthrop K.
Nolte David G.
Dearborn Henry C.
Kulason Robert A.
Ries Carl G.
Roskos Joseph W.
Ruehl Charles A.
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