Optics: measuring and testing – By polarized light examination
Reexamination Certificate
2006-08-01
2006-08-01
Lauchman, Layla G. (Department: 2877)
Optics: measuring and testing
By polarized light examination
C356S039000, C356S368000, C356S367000, C250S225000
Reexamination Certificate
active
07084976
ABSTRACT:
To measure the concentration of an optically active substance in a solution without contacting the solution, the concentration measuring apparatus of the present invention includes: a light source for outputting linearly polarized light; a light intensity detecting element disposed opposite the light source with a sample placed therebetween; an optically active liquid crystal element placed between the light source and the light intensity detection circuit; a control circuit which controls the voltage to be applied to the optically active liquid crystal element so that an output value from the light intensity detecting element will in effect take an extreme value; and a concentration computing circuit for computing the concentration of an optically active substance in the sample, based on an output from the control circuit.
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McNichols and Cote, OPtical glucose sensing in biologocal fluids, Journal of Biomedical Optics, Jan. 2000, vol. 5. No. 1.
Matsumoto Kenji
Morokawa Shigeru
Uematsu Hiroyuki
Yano Takakazu
Citizen Watch Co. Ltd.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Lauchman Layla G.
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