COAXIAL DIFFUSE REFLECTANCE READ HEAD
First Claim
Patent Images
1. A coaxial diffuse reflectance read head comprising:
- (a) a collimated light source;
(b) a beam splitter adapted to receive collimated light from said collimated light source and adapted to direct a portion of said collimated light to an optical fiber;
(c) an optical fiber adapt to direct said collimated light received from said beam splitter at one end of said optical fiber to a test area at a second end of said optical fiber and adapted to direct specular and diffuse light returned from said test area to said beam splitter, said optical fiber being either in contact with said test area or closely approaching said test area; and
(d) a spatial filter adapted to receive said specular light from said beam splitter and to block access of said specular light to a light detector.
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Abstract
Improved performance in reflectance photometry is obtained by employing an optical fiber to direct collimated light to a test area and to return both diffuse and specular light from the test area. Specular light is prevented from reaching a light detector by a spatial filter, while diffuse light is collected and measured.
36 Citations
2 Claims
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1. A coaxial diffuse reflectance read head comprising:
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(a) a collimated light source; (b) a beam splitter adapted to receive collimated light from said collimated light source and adapted to direct a portion of said collimated light to an optical fiber; (c) an optical fiber adapt to direct said collimated light received from said beam splitter at one end of said optical fiber to a test area at a second end of said optical fiber and adapted to direct specular and diffuse light returned from said test area to said beam splitter, said optical fiber being either in contact with said test area or closely approaching said test area; and (d) a spatial filter adapted to receive said specular light from said beam splitter and to block access of said specular light to a light detector.
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2-27. -27. (canceled)
Specification