Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1986-07-02
1989-07-25
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
33178F, 33302, 324207, 376249, G01N 2790, G01B 520, G01B 728, G21C 1700
Patent
active
048517739
ABSTRACT:
An electro-mechanical eddy current probe having a rotatable sensing head for sensing the wall thickness of and locating local defects in a tube or conduit through which it is passed. The rotatable head includes a radially movable, outward projecting sensing member which is spring-biased into engagement with the interior surface of the tube and which carries an eddy current coil or which actuates either the core of a differential transformer, a strain gauge or a rheostat, each electrically monitored by the probe. The cylindrical probe is centered within the tube by a pair of centering guides at either of its ends. The probe also carries a fixed eddy current coil on its non-rotating body portion for detecting and anticipating locations of particular interest within the tube where the longitudinal movement of the probe should be slowed, such as locations of exterior tube support plates where denting is more apt to occur.
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