Title:
OPTICAL FIBER CHARACTERISTIC MEASURING DEVICE AND OPTICAL FIBER CHARACTERISTIC MEASURING METHOD
Document Type and Number:
WIPO Patent Application WO/2020/050076
Kind Code:
A1
Abstract:
This optical fiber characteristic measuring device (1) is provided with: a light source unit (11) which outputs a frequency modulated laser beam; incident units (12, 13, 14, 15) which cause the laser beam outputted from the light source unit to be incident as continuous light (L1) and pulse light (L2) into one end and the other end, respectively, of a fiber under test (FUT); a light detection unit (16) which detects light emitted from the fiber under test and outputs a detection signal (D1); and a wave detection unit (17, 18a) which, in each of a first period (T1), during which scattered light based on the continuous light and the pulse light can be emitted from the fiber under test, and a second period (T2), shorter than the first period, during which scattered light cannot be emitted from the fiber under test, detects scattered light on the basis of an integrated value obtained by integrating the detection signal over a prescribed time interval.
Inventors:
MATSUURA SATOSHI (JP)
KUMAGAI YOSHIHIRO (JP)
KUMAGAI YOSHIHIRO (JP)
Application Number:
PCT/JP2019/033219
Publication Date:
March 12, 2020
Filing Date:
August 26, 2019
Export Citation:
Assignee:
YOKOGAWA ELECTRIC CORP (JP)
International Classes:
G01D5/353
Domestic Patent References:
| WO2008084637A1 | 2008-07-17 |
Foreign References:
| JP2012159387A | 2012-08-23 | |||
| JPH06109589A | 1994-04-19 | |||
| US20060146337A1 | 2006-07-06 | |||
| KR101358942B1 | 2014-02-07 | |||
| JPS607930B2 | 1985-02-28 | |||
| JP5654891B2 | 2015-01-14 |
Other References:
WASHIYAMA, K.; KISHI, M.; HE, Z.; HOTATE, K.: "High Speed BOCDA Measurement of Strain Distribution Using Longitudinal Sweep Method", IEICE GENERAL CONFERENCE, 21 March 2013 (2013-03-21), pages 223, XP009526220, ISSN: 1349-1369
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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