Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1976-05-04
1977-05-24
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250214C, 250227, 315151, G01J 132
Patent
active
040254402
ABSTRACT:
A temperature compensating device for use in regulating the voltage to a lamp in a lightfastness tester. The device includes a plurality of aluminum-coated glass rods adjacent the lamp for transmitting the light produced by the lamp to a light-receiving element, such as a photoelectric cell. A heat-sensitive resistance is electrically connected to the light-receiving element and compensates for changes in temperature of the light-receiving element. An electric circuit is combined with the light-receiving element and the resistance to receive the temperature adjusted voltage from the light-receiving element and the resistance and to compare that voltage with a reference voltage. In turn, the voltage to the xenon lamp is adjusted based on the difference between the two compared voltages.
REFERENCES:
patent: 3336481 (1967-08-01), Nelson
patent: 3734632 (1973-05-01), Matsuda
patent: 3872301 (1975-03-01), Joppich
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