Prestretched shafet for eddy current probe

Details Prestretched shafet for eddy current probe Prestretched shafet for eddy current probe

2005-08-02

2005-08-02

Raevis, Robert (Department: 2856)

Measuring and testing

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Reexamination Certificate

active

06923078

ABSTRACT:
In an eddy current probe shaft, a sleeve encloses an inner core of length shorter than the sleeve causing the inner core to curl within sleeve. The inner core includes data cables that typically comprise coaxial cables to which the sleeve is attached at shaft lead and trail ends. The shaft is assembled by stretching the sleeve over the inner core and securing the stretched sleeve to the inner core, the sleeve causing the inner core to curl as the sleeve returns to its unstretched length. Slack thus produced in the inner core, and particularly in the coaxial cables, allows the probe to bend without stressing the coaxial cables and without two coaxial cables within the sleeve moving relative to each other therein eliminating signal drift phenomenon caused by a change in capacitance characteristics of the coaxial cables when insulation of the coaxial cables stretch upon bending.

REFERENCES:
patent: 4942545 (1990-07-01), Sapia
patent: 5279168 (1994-01-01), Timm
patent: 6339327 (2002-01-01), Potiquet et al.
patent: 0392295 (1990-10-01), None

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