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Title: Flash protection controller

Abstract

A controller provides a high voltage to maintain an electro-optic shutter in a transparent condition until a flash of light which would be harmful to personnel is sensed by a phototransistor. The controller then shorts the shutter to ground to minimize light transmission to the user and maintains light transmission at the pre-flash level for a predetermined time to allow the flash to subside. A log converter and differential trigger circuit keep the controller from being triggered by other light flashes which are not dangerous.

Inventors:
Issue Date:
OSTI Identifier:
6789215
Assignee:
Dept. of Energy
DOE Contract Number:  
AT(29-1)-789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; PROTECTIVE CLOTHING; DESIGN; DAMAGE; DC SYSTEMS; ELECTRIC CONTROLLERS; LIGHT SOURCES; LIGHTING SYSTEMS; NUCLEAR EXPLOSIONS; PHOTOTRANSISTORS; SAFETY; TEMPERATURE DEPENDENCE; TRIGGER CIRCUITS; VISIBLE RADIATION; CLOTHING; CONTROL EQUIPMENT; ELECTROMAGNETIC RADIATION; ELECTRONIC CIRCUITS; EQUIPMENT; EXPLOSIONS; POWER SYSTEMS; PULSE CIRCUITS; RADIATION SOURCES; RADIATIONS; SEMICONDUCTOR DEVICES; TRANSISTORS; 420202* - Engineering- Protective Structures & Equipment

Citation Formats

Galbraith, L K. Flash protection controller. United States: N. p., 1979. Web.
Galbraith, L K. Flash protection controller. United States.
Galbraith, L K. Fri . "Flash protection controller". United States.
@article{osti_6789215,
title = {Flash protection controller},
author = {Galbraith, L K},
abstractNote = {A controller provides a high voltage to maintain an electro-optic shutter in a transparent condition until a flash of light which would be harmful to personnel is sensed by a phototransistor. The controller then shorts the shutter to ground to minimize light transmission to the user and maintains light transmission at the pre-flash level for a predetermined time to allow the flash to subside. A log converter and differential trigger circuit keep the controller from being triggered by other light flashes which are not dangerous.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {12}
}