The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 2006
Filed:
Sep. 28, 2001
Shigeru Morokawa, Higashiyamato, JP;
Takakazu Yano, Tokyo, JP;
Kenji Matsumoto, Tokyo, JP;
Hiroyuki Uematsu, Tanashi, JP;
Shigeru Morokawa, Higashiyamato, JP;
Takakazu Yano, Tokyo, JP;
Kenji Matsumoto, Tokyo, JP;
Hiroyuki Uematsu, Tanashi, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
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.