Fiber optic scanning beam detector

Details Fiber optic scanning beam detector Fiber optic scanning beam detector

1994-03-25

1995-08-22

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359216, 358484, G01J 120

Patent

active

054442397

ABSTRACT:
A fiber optic system is used in a laser ROS scanning system to generate a start of scan signal. In one embodiment, a single optical fiber is positioned at the beginning of a scan line sweep. The fiber transmits a portion of a scan beam energy to a photodetector located on a local electronics board. The photodiode generates an output signal which is sent as an input to a high speed comparator. A second input to the comparator is a divided down and delayed analog of the photodetector output signal. The comparator compares the two voltage wave forms and generates electrical signals at the precise time the two wave forms intersect or crossover. The comparator output is used to initiate the SOS signal of a gas or laser diode ROS.

REFERENCES:
patent: 4010364 (1977-03-01), Fuwa
patent: 4071754 (1978-01-01), Roulund
patent: 4179664 (1979-12-01), Bedwell
patent: 4386272 (1983-05-01), Check, Jr. et al.
patent: 4800270 (1989-01-01), Blais
patent: 5018808 (1991-05-01), Meyers et al.
patent: 5210634 (1993-05-01), Iwama
patent: 5373154 (1994-12-01), Chen

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