Title:
OPTICAL FIBER STRAIN MEASUREMENT METHOD AND OPTICAL FIBER STRAIN MEASUREMENT APPARATUS
Document Type and Number:
WIPO Patent Application WO/2022/234676
Kind Code:
A1
Abstract:
Disclosed is an optical fiber strain measurement method including: a strain amount measurement step S2 for measuring the strain amount εn' of each core wiring of an optical fiber tape core wiring F; a torsion angle calculation step S3 for calculating the torsion angle γ per unit length of the optical fiber tape core wiring F on the basis of the difference Δε' in strain amount between the outer core wiring and the inner core wiring of the optical fiber tape core wiring F; a torsion strain amount calculation step S4 for calculating the strain amount εn caused by torsion of each core wiring of the optical fiber tape core wiring F on the basis of the torsion angle γ per unit length of the optical fiber tape core wiring F; and a tensile strain amount calculation step S5 for calculating the strain amount Δεn caused by torsion of each core wiring of the optical fiber tape core wiring F by subtracting the strain amount εn caused by tension of each core wiring of the optical fiber tape core wiring F from the strain amount εn' of each core wiring of the optical fiber tape core wiring F measured by the strain amount measurement step S2.
Inventors:
NAKAMURA ATSUSHI (JP)
KOSHIKIYA YUSUKE (JP)
HONDA NAZUKI (JP)
KOSHIKIYA YUSUKE (JP)
HONDA NAZUKI (JP)
Application Number:
PCT/JP2021/017573
Publication Date:
November 10, 2022
Filing Date:
May 07, 2021
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G01B11/16
Domestic Patent References:
| WO2019240037A1 | 2019-12-19 |
Foreign References:
| CN111289020A | 2020-06-16 |
Attorney, Agent or Firm:
OKADA, Kenji et al. (JP)
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