Title:
ACOUSTIC SENSOR
Document Type and Number:
WIPO Patent Application WO/2021/084940
Kind Code:
A1
Abstract:
Provided is an acoustic sensor that uses an optical fiber and has high directivity. This acoustic sensor (100) comprises a sensing part (10) and an interrogator (1). The sensing part (10) has a sensing element comprising an optical fiber. The interrogator (1) is connected to the sensing part (10), transmits pulsed light P to the sensing part (10), and detects an acoustic wave (SW) sensed by the sensing part (10) on the basis of reflected return light (RP) from the sensing part (10). The optical fiber of the sensing element is folded so as to repeatedly go back and forth along a directivity direction in which directivity is exhibited.
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Inventors:
YANO YUTAKA (JP)
MISUMI EITARO (JP)
MURAMATSU JUN (JP)
MISUMI EITARO (JP)
MURAMATSU JUN (JP)
Application Number:
PCT/JP2020/034647
Publication Date:
May 06, 2021
Filing Date:
September 14, 2020
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
G01H9/00; H04R23/00
Domestic Patent References:
| WO2005095909A1 | 2005-10-13 |
Foreign References:
| JPH02103422A | 1990-04-16 | |||
| US20120280117A1 | 2012-11-08 | |||
| CN109186743A | 2019-01-11 | |||
| US20160131520A1 | 2016-05-12 | |||
| JP2001041817A | 2001-02-16 | |||
| JPS61214699A | 1986-09-24 | |||
| JP2009535643A | 2009-10-01 | |||
| JPS5948663A | 1984-03-19 | |||
| CN105547453A | 2016-05-04 |
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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