Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1995-05-01
1997-05-06
Le, Que
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250229, 362187, G01J 132
Patent
active
056273622
ABSTRACT:
A portable, hand held light source unit is employed to check operation of fire detectors, such as hydrogen fire detectors. The unit emits radiation in a narrow band of wavelengths which are generated by the type of fire to be tested, but not by other light sources such as the sun or incandescent lamps. The unit can test fire detectors at different distances, and of different sensitivities. The intensity of the radiation emitted by the unit is adjustable for this purpose by means of a rotatable disk having a plurality of different sized apertures for selective placement between the light source and an output lens. The disk can also be rotated to a calibration position which causes a microprocessor circuit in the unit to initiate a calibration procedure. During this procedure, the lamp intensity is measured by a photodetector contained within the unit, and the microprocessor adjusts the lamp current to insure that its intensity remains within a preset range of values. A green and a red LED are mounted on the unit which indicate to an operator whether the calibration is successful, as well as the condition of the unit's battery power supply.
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Moerk John S.
Strobel James P.
Youngquist Robert C.
Le Que
Sheehan William J.
The United States of America as represented by the Administrator
Vrioni Beth A.
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