Title:
OPTICAL-FIBRE SENSOR DEVICE, AND OPTICAL-FIBRE SENSOR SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/003667
Kind Code:
A1
Abstract:
[PROBLEM] To enable a longer measuring distance when measuring with an OTDR. [SOLUTION] The present invention comprises: a light source unit for generating a probe light beam; a light detection unit for detecting a reflected light beam reflected by an optical fibre; and an optical path switchover unit equipped with first to fourth input/output terminals, amongst which the probe light beam is input to the first input/output terminal, and the second input/output terminal is terminated. The optical path switchover unit is capable of assuming: a first state in which the first input/output terminal and the third input/output terminal are connected, and the second input/output terminal and the fourth input/output terminal are connected; and a second state in which the first input/output terminal and the fourth input/output terminal are connected, and the second input/output terminal and the third input/output terminal are connected.
Inventors:
YAMAGUCHI TOKUO (JP)
KOIZUMI KENGO (JP)
SEKI SHOHEI (JP)
MURAI HITOSHI (JP)
KOIZUMI KENGO (JP)
SEKI SHOHEI (JP)
MURAI HITOSHI (JP)
Application Number:
PCT/JP2018/018494
Publication Date:
January 03, 2019
Filing Date:
May 14, 2018
Export Citation:
Assignee:
OKI ELECTRIC IND CO LTD (JP)
International Classes:
G01D5/353
Foreign References:
| JP2015222225A | 2015-12-10 | |||
| JPH03280024A | 1991-12-11 | |||
| US20100085572A1 | 2010-04-08 | |||
| JPH03135743A | 1991-06-10 | |||
| JP2013231657A | 2013-11-14 | |||
| JPH0429024A | 1992-01-31 | |||
| JPH05173024A | 1993-07-13 | |||
| JP2003322588A | 2003-11-14 |
Attorney, Agent or Firm:
KAMEYA, Yoshiaki et al. (JP)
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