Title:
位相測定方法及び信号処理装置
Document Type and Number:
Japanese Patent JP7173313
Kind Code:
B2
Abstract:
It is intended to provide a phase measurement method and a signal processing device that are capable of reducing influence of noise of a measuring device without increasing the peak intensity of an incident light pulse when measuring the phase of scattered light in DAS-P.A phase measurement method according to the present invention causes wavelength-multiplexed pulse light to be incident on a measurement target optical fiber, produces a scattered light vector obtained by plotting scattered light from the measurement target optical fiber for each wavelength onto a two-dimensional plane having the in-phase component thereof on the horizontal axis and the orthogonal component thereof on the vertical axis, rotates the produced scattered light vector for each wavelength at each place in the measurement target optical fiber to align the directions of the vectors, generates a new vector by calculating the arithmetic average of the vectors having the aligned directions, and calculates the phase by using the values of the in-phase and orthogonal components of the generated new vector.
Inventors:
Yoshifumi Wakisaka
Daisuke Iida
Keiji Okamoto
Hiroyuki Oshida
Daisuke Iida
Keiji Okamoto
Hiroyuki Oshida
Application Number:
JP2021519931A
Publication Date:
November 16, 2022
Filing Date:
May 21, 2019
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G01M11/00; G01H9/00; G01J9/00
Domestic Patent References:
| JP2013079906A | ||||
| JP2008523396A |
Foreign References:
| WO2016117044A1 | ||||
| WO2018223236A1 |
Other References:
IIDA D , et al.,Distributed measurement of acoustic vibration location with frequency multiplexed phase-OTDR,Optical Fiber Technology,2017年02月21日,Vol.36,p.19-25,http://dx.doi.org/10.1016/j.yofte.2017.02.005
YANG G , et al.,Long-Range Distributed Vibration Sensing Based on Phase Extraction From Phase-Sensitive OTDR,IEEE Photonics Journal,2016年06月,Volume 8, Number 3,6802412,DOI: 10.1109/JPHOT.2016.2552820
YANG G , et al.,Long-Range Distributed Vibration Sensing Based on Phase Extraction From Phase-Sensitive OTDR,IEEE Photonics Journal,2016年06月,Volume 8, Number 3,6802412,DOI: 10.1109/JPHOT.2016.2552820
Attorney, Agent or Firm:
Kenji Okada
Masaaki Hata
Katsuhiro Imashita
Masaaki Hata
Katsuhiro Imashita