Method of and apparatus for the investigation of inaccessible su

Details Method of and apparatus for the investigation of inaccessible su Method of and apparatus for the investigation of inaccessible su

1985-06-07

1987-04-14

McGraw, Vincent P.

Optics: measuring and testing

With plural diverse test or art

356241, G02B 2326

Patent

active

046573879

ABSTRACT:
A method of and an apparatus for investigating subterranean boreholes especially in bituminous coal mining. Optical fiber cables carry light for illuminating the hole into the latter and an image of the wall of the borehole from the latter to an evaluating means external of the borehole.

REFERENCES:
patent: 3417745 (1968-12-01), Sheldon
patent: 3614891 (1971-10-01), Nolte
patent: 4281929 (1981-08-01), Lord et al.
patent: 4490606 (1984-12-01), Lockett et al.
patent: 4557598 (1985-12-01), Ono et al.

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