Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1991-10-01
1992-10-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250226, 356406, 356407, G01J 350
Patent
active
051591855
ABSTRACT:
A lighting control system for maintaining the light source and measuring components of a color measurement station in a stabilized condition. A high frequency fluorescent lamp drive is controlled by a ballast which is adjusted by a control signal generated by using a video camera to simultaneously view a standard tile and a test sample. One of the color signals in the standard tile portion of the signal is compared with prescribed information stored in a computer, and if the standard tile signal differs from the prescribed information, the microcomputer adjusts the fluorescent lamp drive until the signal from the standard tile reaches the prescribed level, at which time the color signals from the test sample are evaluated while the lamp intensity and camera response are generating standardized measurement conditions.
REFERENCES:
patent: 4278538 (1981-07-01), Lawrence et al.
patent: 4476982 (1984-10-01), Paddock et al.
patent: 4624571 (1986-11-01), Salda et al.
Allen S.
Armstrong World Industries Inc.
Nelms David C.
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