Fail-safe laser apparatus including main and safety shutters for

Details Fail-safe laser apparatus including main and safety shutters for Fail-safe laser apparatus including main and safety shutters for

1985-04-22

1987-05-05

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2504981, G01J 132

Patent

active

046635203

ABSTRACT:
A fail-safe laser apparatus includes a laser beam radiation source for emitting a laser beam along an optical axis, a main shutter for intercepting or attenuating the laser beam incident thereon in its closed position, and a safety shutter for completely intercepting the laser beam incident thereon in its closed position. The main shutter is moved to its open position in coagulating the diseased part. A first sensor produces a first signal indicative of the intensity of the laser beam emitted along the optical axis between the radiation source and the main shutter. A second sensor produces a second signal indicative of the intensity of the laser beam emitted along the optical axis between the main shutter and the safety shutter. A detection circuit is responsive to the first and second signals for actuating a safety shutter control means to move the safety shutter to its open position in accordance with the first and second signals.

REFERENCES:
patent: 4415231 (1983-11-01), Kaczensky et al.
patent: 4543477 (1985-09-01), Doi et al.

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