Title:
MEASUREMENT SYSTEM AND MEASUREMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2020/203373
Kind Code:
A1
Abstract:
According to the present invention, slight movement of the ground surface is detected. A cable includes an optical fiber (F1) and is provided to have friction with the ground surface such that the optical fiber (F1) is expanded and contracted according to the movement of the ground surface. A light output unit (1A) outputs monitoring light to the optical fiber (F1). A partial reflection unit (R11) is provided on a path of the optical fiber (F1) in the cable and partially reflects the monitoring light. A light reception unit (1B) receives the reflected light reflected by the partial reflection unit (R11). A calculation unit (1C) measures the length of the optical fiber (F1) to the partial reflection unit (R11) on the basis of a round-trip propagation time of the received reflected light, and monitors the change over time.
Inventors:
YANO YUTAKA (JP)
MISUMI EITARO (JP)
MISUMI EITARO (JP)
Application Number:
PCT/JP2020/012515
Publication Date:
October 08, 2020
Filing Date:
March 19, 2020
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
G01B11/16; G01D5/353; G01D21/00
Domestic Patent References:
| WO1997048994A1 | 1997-12-24 |
Foreign References:
| JPH0486510A | 1992-03-19 | |||
| JP2001296112A | 2001-10-26 | |||
| JP3110637U | 2005-06-30 | |||
| JP3653550B2 | 2005-05-25 | |||
| JPH0814952A | 1996-01-19 | |||
| JP4187866B2 | 2008-11-26 | |||
| JP3653550B2 | 2005-05-25 | |||
| JP2007518365W | ||||
| JP3440721B2 | 2003-08-25 | |||
| JPS509748B1 | 1975-04-15 | |||
| JP3391341B2 | 2003-03-31 | |||
| US3860900A | 1975-01-14 | |||
| JP2906232B1 | 1999-06-14 | |||
| JP2019073113A | 2019-05-16 |
Other References:
KEIICHI TADOKORO: "Journal of the Society of Instrument and Control Engineers", vol. 53, 2014, THE SOCIETY OF INSTRUMENT AND CONTROL ENGINEERS, article "Observation of seafloor crustal deformation by GPS/acoustic coupling method", pages: 473 - 476
See also references of EP 3951311A4
See also references of EP 3951311A4
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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