Apparatus for determining the reflectivity of the surface of a measured object
First Claim
1. Apparatus for determining the reflectivity of the surface of a measured object, in particular for determining properties of the measured object which are connected with its reflectivity, comprisinglight source means for emitting light along a light path onto the surface of the measured object so that a wide-band light beam impinges onto said surface and is reflected therefrom,photo-detection means for evaluation,a concave mirror in the path of the light reflected from the surface of the measured object and focused on the measured object for collecting the reflected light and conveying it to and concentrating it on said photo-detection means,a pair of narrow-band light filters which pass, respectively, light beams of different narrow bands of wavelengths effective for evaluation by the photo-detection means,said photo-detection means comprising two separate photo-detectors immediately adjacent each other, side by side, each covered by one of said narrow-band filters, said filters being immediately adjacent each other, side by side, and directly over their respective photo-detectors fixed in their positions relative to said photo-detectors and transmitting their different wavelengths of light to their respective photo-detectors, andcooling means connected to the photo-detectors and also to said narrow-band filters.
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Abstract
Apparatus for determining the reflectivity of the surface of a measured object, and, in particular, for determining properties of the measured object which are connected with its reflectivity. A light source emits light along a light path so that a wide-band light beam impinges on the surface of the measured object. The light reflected by the surface of the measured object goes through a pair of narrowband light filters which pass, respectively, light beams of different narrow bands of wave-lengths effective for evaluation by a photo-detection device. The photo-detection device comprises two separate photo-detectors each covered by one of the narrow-band filters. The filters are fixed in their positions relative to the photo-detectors and transmit their different wave-lengths of light to their respective photo-detectors.
20 Citations
5 Claims
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1. Apparatus for determining the reflectivity of the surface of a measured object, in particular for determining properties of the measured object which are connected with its reflectivity, comprising
light source means for emitting light along a light path onto the surface of the measured object so that a wide-band light beam impinges onto said surface and is reflected therefrom, photo-detection means for evaluation, a concave mirror in the path of the light reflected from the surface of the measured object and focused on the measured object for collecting the reflected light and conveying it to and concentrating it on said photo-detection means, a pair of narrow-band light filters which pass, respectively, light beams of different narrow bands of wavelengths effective for evaluation by the photo-detection means, said photo-detection means comprising two separate photo-detectors immediately adjacent each other, side by side, each covered by one of said narrow-band filters, said filters being immediately adjacent each other, side by side, and directly over their respective photo-detectors fixed in their positions relative to said photo-detectors and transmitting their different wavelengths of light to their respective photo-detectors, and cooling means connected to the photo-detectors and also to said narrow-band filters.
Specification