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:
Sep. 15, 2009
Filed:
Aug. 17, 2005
Kiyoshi Kurosawa, Chiyoda-ku, JP;
Kazuomi Shirakawa, Chiyoda-ku, JP;
Kiyoshi Kurosawa, Chiyoda-ku, JP;
Kazuomi Shirakawa, Chiyoda-ku, JP;
The Tokyo Electric Power Company, Incorporated, Tokyo, JP;
Abstract
[Problem] To permit reduction in the temperature dependence of a sensor, which is ascribable to the temperature dependence of the Verdet constant of a sensor fiber, at a low cost. [Means for Resolution] In a prior-art optical sensor fiber of reflection type, reduction in the temperature dependence of a sensor is coped with by, e.g., duplexing a signal processing circuit and a receiving optical system, so as to execute the mean processing of modulation signals, whereas in this invention, the elimination of the temperature dependence of a modulation signal is realized by selecting a ferromagnetic Faraday rotorso that a modulation degree (S) expressed by the ratio between an AC component and a DC component may become constant or within a certain range, so as to especially simplify a configuration and to attain a lower cost.