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:
Jul. 21, 2020
Filed:
Jan. 31, 2017
Applicant:
Furukawa Electric Co., Ltd., Tokyo, JP;
Inventor:
Masateru Tadakuma, Tokyo, JP;
Assignee:
FURUKAWA ELECTRIC CO., LTD., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01H 9/00 (2006.01); G01V 1/00 (2006.01); G01D 5/353 (2006.01); G01V 1/22 (2006.01); E21B 47/00 (2012.01);
U.S. Cl.
CPC ...
G01H 9/004 (2013.01); E21B 47/00 (2013.01); G01D 5/353 (2013.01); G01D 5/35358 (2013.01); G01V 1/00 (2013.01); G01V 1/226 (2013.01);
Abstract
An optical fiber sensor includes: a transmitting unit configured to output two lights into an optical fiber, wavelengths of the two lights being different from each other at a specific time, and at least one of the wavelengths of the two lights varying with time; and a measuring unit configured to receive back-scattered light output from the optical fiber and detect a temporal variation of an optical phase at an arbitrary interval in a longitudinal direction of the optical fiber by measuring measure an interference state of the two lights.