Control circuit for variable characteristic rotating eddy curren

Details Control circuit for variable characteristic rotating eddy curren Control circuit for variable characteristic rotating eddy curren

1990-08-08

1991-10-22

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Combined

324238, 324262, G01N 2772, G01R 3312

Patent

active

050599046

ABSTRACT:
A detachable, articulated rotating eddy current inspection tool includes a body member having a connector at one end for mechanically and electrically attaching the body member to a rotating drive member while at the other an eddy current probe is supported for radial movement with respect to the axis of rotation of the body member. A motor located within the body moves a slide on which the probe is mounted while at the same time a counterbalancing slide is moved radially in the opposite direction to maintain said tool in dynamic balance. An encoder housed within said body member senses the location of said eddy current probe with respect to the axis of rotation of said body member. A rotary transformer is used to transfer signals which control the position of the probe and to receive information from the eddy current probe and the encoder. The encoder output signals are modulated by the eddy current probe exciter signal to enable probe position information to be sent through a rotary transformer.

REFERENCES:
patent: 4219774 (1980-08-01), Rogel et al.

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