Luminescense and reflectance detection radiometer with changeabl

Details Luminescense and reflectance detection radiometer with changeabl Luminescense and reflectance detection radiometer with changeabl

1985-06-18

1987-06-09

Evans, F. L.

Optics: measuring and testing

By shade or color

With color transmitting filter

2504581, 356419, G01N 2164

Patent

active

046716629

ABSTRACT:
The present invention provides a radiometer for simultaneously detecting luminescence and reflectance about a particular Fraunhofer line from a material (i.e. target) which includes an interchangeable optical filter assembly of lightweight construction for each Fraunhofer line of interest which substantially alleviates the adverse polarization effects normally experienced in radiometers of this type and which further provides an improved balance between the two light beams being sensed by the radiometer. The optical filter assembly includes a single beamsplitter which reflects the majority of the light from the target with little adverse polarization effects to a narrow band filter which passes only the light existing at the particular Fraunhofer line (i.e. "c" component of luminescence). The remaining smaller fraction of the light passes through the beamsplitter with only slightly greater polarization to a broad band filter which, in turn, passes only the light in the continuums adjacent the Fraunhofer line (i.e. "d" component of luminescence). The intensity of the light from the narrow and broad band filters are measured for use in calculating the luminescence and reflectance emanating from the target.

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Hemphill et al., Proc. 6th International Symp on Remote Sensing of Environment, Ann Arbor, Mich. (13-16 Oct. 1969).

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