Device for protecting against excessive high energy radiation ha

Details Device for protecting against excessive high energy radiation ha Device for protecting against excessive high energy radiation ha

1992-11-09

1993-11-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

359241, 358229, G01J 120

Patent

active

052646904

ABSTRACT:
This invention relates to a device for the protection of eyes, electro-optical sensors and sensitive materials against high energy light beams, in which the incidence of a high energy light beam on the element to be protected is detected by a warning sensor. The warning sensor triggers a light source to provide a light beam which, with minimal delay, causes a diminution in the transmissivity of a protective element interposed in the beam path of the high intensity light beam. Due to the extremely rapid response time of these components, the protective response of the invention adapts almost immediately to changes in the intensity of an incident high energy light beam, thereby providing necessary protection and a prompt return to normal transmissivity upon termination of the potentially damaging radiation.

REFERENCES:
patent: 4721850 (1988-01-01), Sakai et al.
patent: 4920257 (1990-04-01), Fuerthbauer et al.
patent: 5049730 (1991-09-01), Loveland

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