Flash protection controller

Patent · Fri Dec 07 00:00:00 EST 1979

OSTI ID:6789215

Galbraith, L K

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.

• DOE Contract Number: AT(29-1)-789
• Assignee: Dept. of Energy
• OSTI ID: 6789215
• Country of Publication: United States
• Language: English

Related Subjects

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
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