Electricity: measuring and testing – For insulation fault of noncircuit elements – Where a moving sensing electrode scans a stationary element...
Patent
1995-11-08
1997-06-17
Wieder, Kenneth A.
Electricity: measuring and testing
For insulation fault of noncircuit elements
Where a moving sensing electrode scans a stationary element...
324718, 324557, 340605, 73 40, G01M 316
Patent
active
056400969
ABSTRACT:
Portable apparatus for inducing an alternating electrical gradient into an impounded liquid media and including, directionally sensitive, sensing apparatus for monitoring gradients established in the liquid to detect leaks at a liquid impermeable membrane. A conductive electrode floated on the liquid directs an amplified square wave signal into the liquid at a 5 to 15 hertz frequency relative to a ground reference established outside the membrane. First and second recessed sensors in a portable, hollow tubular probe are manipulated within the liquid. A portable signal processor monitors a changing signal between the sensors as the probe is moved in the liquid. The sensed and source signals are snychronously sampled, integrated, subtracted in a positive correlation arrangement, and amplified to reject common mode signals within the liquid. The resultant signal is coupled to a voltage controlled oscillator and headset, which produces an audible annunciation indicative of the leak location, and which signal is directionally sensitive to probe position relative to the leak. Self-supporting, cover assemblies isolate electrical accessories, such as lights, appended to the membrane. A flexible probe for locating leaks in supply and return conduits is also disclosed.
REFERENCES:
patent: 4719407 (1988-01-01), Converse
patent: 4725785 (1988-02-01), Converse
patent: 4740757 (1988-04-01), Converse
patent: 5081422 (1992-01-01), Shih
patent: 5184083 (1993-02-01), Groover
patent: 5540085 (1996-07-01), Sakata
Anderson Manufacturing Co.
Solis Jose M.
Tschida D. L.
Wieder Kenneth A.
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