Electromagnetic method for non-destructive testing of prestresse

Details Electromagnetic method for non-destructive testing of prestresse Electromagnetic method for non-destructive testing of prestresse

1997-10-08

2000-10-03

Patidar, Jay

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324240, G01N 2782

Patent

active

061278238

ABSTRACT:
A method for detecting breaks in a prestressed wire, rod or bar embedded in concrete surrounding a metal pipe is described. A remote field eddy current probe is traversed axially internally through the pipe so as to create an energy flow path externally of the pipe and a transformer coupling through the pipe, and generate a signal in a detector coil axially spaced from an exciter coil. As the exciter coil traverses the wire, rod or bar containing the break a signal change is generated, regardless of the radial position of the detector coil relative to the break.

REFERENCES:
patent: 3651506 (1972-03-01), Olaf et al.
patent: 3834524 (1974-09-01), Ratz et al.
patent: 4806863 (1989-02-01), White
patent: 4814702 (1989-03-01), Driggers et al.
patent: 5168266 (1992-12-01), Fukuda

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