Radiation measuring apparatus

Optics: measuring and testing – By shade or color – Fluid color transmission examination

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Details

250204, 350171, 356410, G01N 2185, G02B 2714

Patent

active

043796370

ABSTRACT:
A colorimeter in which a light source, a collimating lens and a band pass filter are supported by a housing that is movable with respect to a stationary beam dividing assembly in a direction at least substantially transverse to the optical axis of the light from the source. The assembly separates the incoming collimated and filtered light into a sample beam and a reference beam which are directed back toward the housing in directions parallel to the optical axis. The movement of the housing toward or away from the sample produces an increase or decrease in the intensity of the light illuminating the sample and a corresponding decrease or increase in the intensity of the light at the reference detector. The arrangement is such that the apparatus may be readily adjusted to obtain accurate colorimeter readings even for samples having abnormally high or low density characteristics.

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patent: 4273449 (1981-06-01), Schmid
Smith, Warren J., "Modern Optical Engineering", McGraw-Hill, New York, 1966, pp. 84-96.

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