Title:
光ファイバ測定方法、光ファイバ測定システムおよび光ファイバ測定装置
Document Type and Number:
Japanese Patent JP5222513
Kind Code:
B2
Abstract:
To provide a method, system, and device for an optical fiber measuring which measures simultaneously a temperature distribution and a strain distribution of an optical fiber.
Two optical fibers 6, 7 are installed in parallel under the same temperature environment so that a strain distribution is applied to only one optical fiber 6 thereof, and that the other optical fiber 7 is installed in a free state, Then the two optical fibers are subjected to B-OTDR measurement, to thereby find Brillouin frequency shifts Δf1, Δf2of each optical fiber 6, 7. A smaller value (Δf2) of the two acquired Brillouin frequency shifts is divided by a temperature dependency coefficient CTto thereby calculate the temperature distribution, and a difference (Δf1-Δf2) between the two Brillouin frequency shifts is divided by a strain dependency coefficient Cεto thereby calculate the strain distribution.
COPYRIGHT: (C)2009,JPO&INPIT
Inventors:
Daisuke Iida
Fumihiko Ito
Application Number:
JP2007250212A
Publication Date:
June 26, 2013
Filing Date:
September 26, 2007
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G01D5/353; G01B11/16; G01K11/12; G01M11/00
Domestic Patent References:
| JP200075174A | | | | |
| JP2007132746A | | | | |
| JP1048067A | | | | |
Attorney, Agent or Firm:
Kurata Masatoshi
Toshizo Koide
Yoshio Ishikawa
