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:
Dec. 03, 2007
Seiji Kojima, Hitachi, JP;
Seiji Kojima, Hitachi, JP;
Hitachi Cable, Ltd., Tokyo, JP;
Abstract
A physical quantity measuring system includes an optical fiber in which plural fiber Bragg gratings having different reflection wavelength changing bands are formed along the optical fiber in a longitudinal direction, a light source which outputs a broadband light into the optical fiber, an arrayed waveguide grating and an operating portion. The arrayed waveguide grating divides a light reflected by the fiber Bragg grating and outputted from the optical fiber into plural divisional wavelength bands. The arrayed waveguide grating outputs the divided lights to output channels. The operating portion detects a change of a reflected center wavelength of each fiber Bragg grating by a change of an output of each light-receiving element, operates a physical quantity and a position thereof given to the optical fiber, and is capable of detecting light from adjacent output channels.