Title:
光ファイバセンサ装置及び振動位置特定方法
Document Type and Number:
Japanese Patent JP6786963
Kind Code:
B2
Abstract:
The optical fiber sensor device comprises a probe light supply unit, an optical fiber sensor unit, and a polarization state measuring unit. The probe light supply unit generates and outputs a polarization switched light beam by alternately switching a polarized CW light beam in polarization directions orthogonal to each other with elapse of time. The optical fiber sensor unit includes a loop-state optical fiber into which the polarization switched light beam is input and which outputs a light wave reflecting a change of birefringence according to a stress applied from an outside in the polarization switched light beam. The polarization state measuring unit observes polarization states of the respective light waves propagating clockwise and counterclockwise through the optical fiber. The polarization state measuring unit calculates an angular velocity vector ωb defined by an equation that specifies a relationship between a temporal change rate dsout(t)/dt of a Stokes vector sout(t) giving a polarization state of the light wave from the optical fiber and the Stokes vector sout(t) for each of the clockwise and counterclockwise light waves. The angular velocity vector ωb gives a direction of a rotation center axis and a rotation angular velocity of the Stokes vector sout(t).
Inventors:
Yoshihiro Kanda
Application Number:
JP2016168366A
Publication Date:
November 18, 2020
Filing Date:
August 30, 2016
Export Citation:
Assignee:
Oki Electric Industry Co., Ltd.
International Classes:
G01H9/00; G01B11/00; G01D5/26; G01V8/16
Domestic Patent References:
| JP2008203239A | ||||
| JP2003247887A | ||||
| JP2007255966A | ||||
| JP2000182158A |
Other References:
Yoshihiro KANDA、Hitoshi MURAI,“Novel extraction method of the maximum variation-rate of State-of-Polarization vector from time-varying birefringence”,2016 Optical Fiber Communications Conference and Exhibition,米国,IEEE,2016年 3月20日,pp.1783-1785,(W2A.31.pdf)
Attorney, Agent or Firm:
Hiroyuki Okada
Takashi Ogaki
Takashi Ogaki