Probe with radially extendable and retractable detector assembly

Details Probe with radially extendable and retractable detector assembly Probe with radially extendable and retractable detector assembly

1992-03-16

1993-09-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

335443, 165 111, 376245, G01N 2790, G21C 17017

Patent

active

052472515

ABSTRACT:
An eddy current probe, especially useful for inspecting roll plugs in steam generator tubes, has a detector assembly which is automatically extended and retracted in a radial recess in an elongated body to prevent damage to the detector assembly during insertion and retraction of the probe, yet permits the detector assembly to bear against the interior wall of the roll plug, including the roll zone. In one embodiment, a mechanical actuator in the form of a pair of finger members spring biased radially outward operate through camming surfaces to rotate a pivot member which retracts the detector assembly; however, when the probe enters the bore of a roll plug the fingers are compressed to permit extension of the detector assembly. In another embodiment, a linear actuator such as a solenoid rotates the pivot member to extend and retract the detector assembly. A lost motion connection between the pivot member and the spring biased eddy current detector assembly permits the detector assembly to track the interior surface of the roll plug including the roll zone.

REFERENCES:
patent: 4105972 (1978-08-01), Smith
patent: 4341113 (1982-07-01), Gutzwiller, Jr.
patent: 4625165 (1986-11-01), Rothstein
patent: 4851773 (1989-07-01), Rothstein
patent: 4937524 (1990-06-01), Fasnacht et al.
patent: 4992735 (1991-02-01), Cullen et al.
patent: 5134367 (1992-07-01), Griffith et al.

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