Eddy current inspection tool which is selectively operable in a

Details Eddy current inspection tool which is selectively operable in a Eddy current inspection tool which is selectively operable in a

1980-10-29

1983-10-25

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Combined

324207, 324219, 324227, 324238, 350 9626, G01N 2790, G01R 3312, G01B 714, G02B 517

Patent

active

044121776

ABSTRACT:
A miniaturized inspection tool, for testing and inspection of metal objects in locations with difficult accessibility, which comprises eddy current sensing equipment (12) with a probe coil (11), and associated coaxial coil cable (13), coil energizing means (21), and circuit means (21, 12) responsive to impedance changes in the coil as effected by induced eddy currents in a test object to produce a data output signal proportional to such changes. The coil and cable are slideably received in the utility channel of the flexible insertion tube 17 of fiberoptic scope 10. The scope 10 is provided with light transmitting and receiving fiberoptics for viewing through the flexible tube, and articulation means (19, 20) for articulating the distal end of the tube and permitting close control of coil placement relative to a test object. The eddy current sensing equipment includes a tone generator 30 for generating audibly signals responsive to the data output signal. In one selected mode of operation, the tone generator responsive to the output signal above a selected level generates a constant single frequency tone for signalling detection of a discontinuity and, in a second selected mode, generates a tone whose frequency is proportional to the difference between the output signal and a predetermined selected threshold level.

REFERENCES:
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patent: 4268791 (1981-05-01), Rogel et al.
patent: 4274054 (1981-06-01), Savidge et al.
patent: 4303879 (1981-12-01), Podhrasky
patent: 4309658 (1982-01-01), Leff
Eddy Current Test Equipment "Nondestructive Testing Handbook" Robt. C. McMaster, vol. II N.Y., The Ronald Press Co., 1959 Sec 40, pp. 1-10.
Lancaster, Donald E., Electronic Metal Locators.

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