Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1993-01-07
1996-04-09
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
324232, 324242, 324225, G01N 2790, G01R 3312
Patent
active
055065031
ABSTRACT:
An eddy current probe for insertion into a tube to be inspected includes a transmitter coil and a pair of sensing coils. The pair of sensing coils have opposite polarity relative to one another and are series connected to provide a differential output. The pair of sensing coils and the transmitter coil are disposed on the surface of the probe. The pair of sensing coils being equally spaced from the transmitter coil and separate from each longitudinally on the probe. Each sensing coil in the pair of sensing coils is thereby angularly displaced from a plane transverse to the probe as measured from the transmitter coil with which a multi-coil unit is formed. Bracelets of coils are formed from plural multi-coil units aligned around the probe to improve sensitivity of the probe. Additional bracelets of coils may be added to the probe, offset rotationally, to improve coverage of the tube. The additional bracelets are longitudinally spaced to prevent interference between transmitter coils of one bracelet and receiver coils of the other bracelet.
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Cecco Valentino S.
Marini Laura O.
Sharp Frederick L.
Atomic Energy of Canada Limited
O'Shea Sandra L.
Patidar Jay M.
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