Title:
PHASE MEASUREMENT METHOD AND SIGNAL PROCESSING DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/203332
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a phase measurement method and a signal processing device capable of reducing the influence of noise of a measuring instrument without increasing the peak intensity of incident light pulses when measuring the phase of scattered light in DAS-P. A phase measurement method according to the present invention comprises: causing wavelength-multiplexed pulsed light to enter an optical fiber being measured; creating scattered light vectors by plotting scattered light of different wavelengths from the optical fiber being measured on a two-dimensional plane having in-phase component as a horizontal axis thereof and orthogonal component as a vertical axis thereof; matching orientations of the created scattered light vectors by rotating the created scattered light vectors at points on the optical fiber being measured on a per-wavelength basis; generating a new vector by adding up and averaging the orientation-matched vectors; and calculating a phase using values of the in-phase component and the orthogonal component of the generated new vector.
Inventors:
WAKISAKA YOSHIFUMI (JP)
IIDA DAISUKE (JP)
TOGE KUNIHIRO (JP)
OSHIDA HIROYUKI (JP)
IIDA DAISUKE (JP)
TOGE KUNIHIRO (JP)
OSHIDA HIROYUKI (JP)
Application Number:
PCT/JP2020/012211
Publication Date:
October 08, 2020
Filing Date:
March 19, 2020
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G01H9/00; G01D5/353
Domestic Patent References:
| WO2018134137A1 | 2018-07-26 | |||
| WO2019018894A1 | 2019-01-31 |
Foreign References:
| JP2019504323A | 2019-02-14 | |||
| JP2017516093A | 2017-06-15 | |||
| US20180031471A1 | 2018-02-01 |
Other References:
ALI. MASOUDIT. P. NEWSON: "Contributed Rview: Distributed optical fibre dynamic strain sensing", REVIEW OF SCIENTIFIC INSTRUMENTS, vol. 87, 2016, pages 011501
KEN'ICHI NISHIGUCHILI CHE-HSIENARTUR GUZIKMITSUNORI YOKOYAMAKINZO MASUDA: "Fiber-Optic Distributed Acoustic Sensor and Its Signal Processing", IEICE TECH. REP, vol. 115, no. 202, 2015, pages 29 - 34
G. YANGET: "Long-Range Distributed Vibration Sensing Based on Phase Extraction from Phase-Sensitive OTDR", IEEE PHOTONICS JOURNAL, vol. 8, no. 3, 2016, XP011607611, DOI: 10.1109/JPHOT.2016.2552820
See also references of EP 3951334A4
KEN'ICHI NISHIGUCHILI CHE-HSIENARTUR GUZIKMITSUNORI YOKOYAMAKINZO MASUDA: "Fiber-Optic Distributed Acoustic Sensor and Its Signal Processing", IEICE TECH. REP, vol. 115, no. 202, 2015, pages 29 - 34
G. YANGET: "Long-Range Distributed Vibration Sensing Based on Phase Extraction from Phase-Sensitive OTDR", IEEE PHOTONICS JOURNAL, vol. 8, no. 3, 2016, XP011607611, DOI: 10.1109/JPHOT.2016.2552820
See also references of EP 3951334A4
Attorney, Agent or Firm:
OKADA, Kenji et al. (JP)
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