Fibre-optic photoelectric beam device having a transmitting opti

Details Fibre-optic photoelectric beam device having a transmitting opti Fibre-optic photoelectric beam device having a transmitting opti

1996-04-29

1998-04-14

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250221, 2505594, H01J 516

Patent

active

057395268

ABSTRACT:
A photoelectric beam device comprises a light source, a monomode optical fibre, a transmitting optical unit, a reflector and a photodetector, where the transmitting optical unit comprises a collimation optical unit, e.g. in the form of a graded index lens or rod lens and a beam expansion optical unit e.g. in the form of a telescopic optical unit. A fibre-optic directional coupler, arranged between the light source and the monomode fibre, conducts to the photodetector the optical signal reflected back from the reflector to the transmitting optical unit and refocused into the fibre.

REFERENCES:
patent: 4442350 (1984-04-01), Rashleigh
patent: 4766323 (1988-08-01), Franklin et al.
patent: 4962988 (1990-10-01), Swann
patent: 5008529 (1991-04-01), Nakamura
patent: 5233185 (1993-08-01), Whitaker
patent: 5343036 (1994-08-01), Bohnert
Laser vol. 6,--pp. 11-13--"Erweiterte Einsatz"--Author: Roland Hackenjos--Germany, Jan. 1994.
Laser und Optoelektronik No. 3,--pp. 283-287--"Die Optische Kernzentrierung" Wolfgang Janiec, Germany, Jan. 1987.

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