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Electromagnetic method for non-destructive testing of prestressed concrete pipes for broken prestressing wires
Electromagnetic method for non-destructive testing of prestressed concrete pipes for broken prestressing wires
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机译：电磁法对断裂的预应力钢丝预应力混凝土管进行无损检测
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摘要
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.
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