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:
Oct. 09, 2012
Filed:
Jan. 07, 2008
Satoshi Nishikawa, Tokyo, JP;
Masakazu Takabayashi, Tokyo, JP;
Kiichi Yoshiara, Tokyo, JP;
Eiji Yagyu, Tokyo, JP;
Tateki Mitani, Tokyo, JP;
Yutaro Hamatani, Tokyo, JP;
Satoshi Nishikawa, Tokyo, JP;
Masakazu Takabayashi, Tokyo, JP;
Kiichi Yoshiara, Tokyo, JP;
Eiji Yagyu, Tokyo, JP;
Tateki Mitani, Tokyo, JP;
Yutaro Hamatani, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
An optical fiber sensor measuring refractive index of a medium with high sensitivity in a wide range. The optical fiber sensor includes an optical fiber causing a transmission loss due to leakage in the clad propagation mode from a portion of a core and a clad where a Bragg grating is provided, a light source permitting light in a wavelength band in the clad propagation mode to enter the optical fiber, and a light-receiving section receiving the transmitted or reflected light transmitted through the core and the clad at the portion where the Bragg grating is provided. The refractive index of the medium to be measured in contact with the clad is measured according to total intensity of the light received by the light-receiving section. The Bragg grating is inclined at a predetermined angle of inclination to the vertical line vertical to the length direction of the optical fiber.