Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-01-25
1991-11-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356448, G01N 2186
Patent
active
050650360
ABSTRACT:
An optical detection and control system is described for controlling the brightness of a lamp, or compensating for variations in the brightness of a lamp, such as is used, for example, in a glossmeter, hazemeter, reflectometer, colourimeter or opacity meter. In one system light is transmitted along a path from the light source (1) to a region of interest (8), means (10) are arranged to detect light scattered from the said path, and a power control (12) is coupled to the detecting means (10) to control the brightness of the light source. In another system light is transmitted along a path from the light source (1) to a region of interest (8), a first detector (10) detects light scattered from the said path, a second detector (9) detects light which has reached the region of interest (8), and a signal is produced which is proportional to the ratio of the outputs of the two detectors (8, 9).
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Cropper Peter R.
Haffenden Gary P.
Justice Jeremy K.
Allen S.
Nelms David C.
Rhopoint Instrumentation Limited
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