Electricity: measuring and testing – For insulation fault of noncircuit elements – Where a moving sensing electrode scans a stationary element...
Patent
1990-04-18
1992-01-28
Snow, Walter E.
Electricity: measuring and testing
For insulation fault of noncircuit elements
Where a moving sensing electrode scans a stationary element...
G01Y 311, G01R 3108
Patent
active
050846809
ABSTRACT:
A method for detecting exposed steel in the surface of reinforced concrete, comprising the steps of: moving an electrode across an exposed surface of said concrete; connecting said electrode to one terminal of a power source; connecting the other terminal of said power source to the reinforcement of said concrete; said power source providing a high voltage current effective to produce a spark across an air gap occurring when exposed steel is detected, said spark initiating a means to signal the occurrence of said exposed steel.
REFERENCES:
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patent: 2920270 (1960-01-01), Saw
patent: 3284789 (1966-11-01), Fisher
patent: 3339136 (1967-08-01), Rasor et al.
patent: 4506485 (1985-03-01), Apostolos
A publication entitled "Cathodic Protection of Reinforced Concrete Using Metallized Zinc", Materials Performance, vol. 26, Dec., 1987, pp. 22-28.
A Federal Highway Administration Report entitled "Further Improvements in Cathodic Protection of Bridge Structures", Report FHWA RD-87/062, dated Jun., 1987, pp. 8-10, 46-50.
A California Department of Transportation report dated May, 1989, entitled "Development, Testing and Field Application of Metallized Cathodic Protection Coatings on Reinforced Concrete Substructures", Report No. FHWA/CA/TL-89/04, pp. 31, 64, 69, 92, 93.
Bennett John E.
Mitchell Thomas A.
Eltech Systems Corporation
Freer John J.
Snow Walter E.
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