Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Reexamination Certificate
2006-02-21
2006-02-21
Patidar, Jay (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
C324S240000
Reexamination Certificate
active
07002340
ABSTRACT:
A method for detecting breaks in a prestressed wire, rod or bar in prestressed concrete pressure pipe (PCCP), embedded in concrete and/or mortar is described. A remote field eddy current exciter/transformer coupling probe is traversed axially internally through the PCPP so as to create an energy flow path within and external to the wall of the PCPP and to induce a transformer coupling from the prestressing winding thus generating a signal in a detector spaced from and usually approximately coplanar with the exciter. As the exciter traverses a break in the wire, rod or bar, a small signal change is generated in the detector, nearly regardless but not independent of the radial position of the detector relative to the break.
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