Fiberoptic head with fiber bundles having different numerical ap

Details Fiberoptic head with fiber bundles having different numerical ap Fiberoptic head with fiber bundles having different numerical ap

1980-07-03

1983-04-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

G02B 514

Patent

active

043792251

ABSTRACT:
A fiberoptic head includes, for each channel, two separate illuminating fiberoptic bundles and a light receiving fiberoptic bundle. Each illuminating fiberoptic bundle has its input end adjacent a light source. The light receiving fiberoptic bundle has its output end adjacent to a light detector. A block is provided with first, second and third passageways terminating at separate elongated apertures at the operative surface thereof. Each bundle extends through a different one of the passageways with the illuminating bundles terminating at apertures spaced from either side of the aperture for the light receiving bundle. The exterior apertures are located such that the projected illumination patterns overlap on the zone on the test surface from which the receiving bundle gathers light. The numerical aperture of the fibers in the light receivig bundle is selected to be less than the numerical aperture of the fiber in the illuminating bundle to increase the resolution and perceive only the center of the overlapping patterns of illumination.

REFERENCES:
patent: 3535537 (1970-10-01), Powell
patent: 3814933 (1974-06-01), Weber
patent: 3937558 (1976-02-01), Mukai et al.
patent: 3942866 (1976-03-01), Roman
patent: 3953730 (1976-04-01), Henry et al.

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