Optics: measuring and testing – Of light reflection
Patent
1997-04-25
1999-02-23
Kim, Robert
Optics: measuring and testing
Of light reflection
356446, G01N 2155
Patent
active
058750320
ABSTRACT:
A surface plasmon sensor includes a prism, a metal film which is formed on one face of the prism and is brought into contact with a sample, a light source emitting a light beam, and an optical system which causes the light beam to enter the prism so that various angles of incidence of the light beam to the interface between the prism and the metal film can be obtained. First and second photodetectors respectively detect the amounts of light of first and second parts of the light beam reflected in total reflection from the interface. The first part is a light bundle reflected from the interface at angles in a first reflecting angle range and the second part is a light bundle reflected from the interface at angles in a second reflecting angle range different from the first reflecting angle range. A comparator compares the light amount signal output from the first photodetector with that output from the second photodetector.
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Fuji Photo Film Co. , Ltd.
Kim Robert
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