Method for detecting flaws in a steam generator tube using a flexible eddy current probe having coil bank switching
First Claim
1. A method of detecting flaws in a tube, comprising the steps of providing a probe assembly having a probe head with a plurality of coils, dividing said plurality of coils into a first set and a second set of coils, spacing said first set and said second set about a circumference thereof, switching between said first set and said second set of coils with a bank switch, and receiving at remotely located instrumentation output signals, which are transmitted over conductors from said coils, representative of said flaws.
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Accused Products
Abstract
A method and apparatus for inspecting the profile of the inner wall of a conduit, such as a heat exchanger in a steam generator by a probe body that includes eddy current sensing coils. The number of eddy current sensing coils is increased for more completely sensing the conduit surface without a corresponding increase in coaxial cables by the use of a bank switch which switches respective banks of coils to existing conduits.
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2 Claims
- 1. A method of detecting flaws in a tube, comprising the steps of providing a probe assembly having a probe head with a plurality of coils, dividing said plurality of coils into a first set and a second set of coils, spacing said first set and said second set about a circumference thereof, switching between said first set and said second set of coils with a bank switch, and receiving at remotely located instrumentation output signals, which are transmitted over conductors from said coils, representative of said flaws.
Specification