Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1992-12-17
1994-08-16
Strecker, Gerard R.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
32420726, 324226, 324229, 324326, 364507, 364561, G01B 710, G01B 714, G01B 726, G01V 3165
Patent
active
053390237
ABSTRACT:
A measuring apparatus which accurately locates reinforcing bars in underwater concrete structures such as piers, retaining walls, easements and the like and measures the amount of concrete covering each reinforcing bar. The measuring apparus comprises a probe which generates a magnetic field and which is moved over the surface of the underwater concrete structure under test. When the poles of the magnetic field are in parallel alignment with and directly over a reinforcing bar within the structure a disturbance occurs in the magnetic field with the magnitude of the disturbance being indicative of the depth of concrete covering the reinforcing bar. An electronics module electrically coupled to the probe provides an analog output signal which is indicative of the distance between a reinforcing bar within the concrete structure under test and the probe. This analog signal is supplied to a meter which provides a visual indication of the location of the reinforcing bar and a microprocessor which then calculates the depth of the reinforcing bar within the concrete sructure.
REFERENCES:
patent: 4531091 (1985-07-01), Kusenberger et al.
patent: 4837489 (1989-06-01), McFee
patent: 4837509 (1989-06-01), Dodmann et al.
Valley, Rich; Instruction Manual for R-Meter Model C-4956 "IC Provides opal Lead-Acid Battery Charging Cycle"; EDN; Oct. 31, 1985, pp. 163-178.
"Underwater Concrete Inspection Equipment". A. Smith et. al. NCEL Tech Note N-1828; Apr. 91.
Goff Dan
Kruchowy Roman
Smith Anthony
Forrest, Jr. John L.
Kalmbaugh David S.
Sliwka Melvin J.
Strecker Gerard R.
The United States of America as represented by the Secretary of
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