Title:
SENSING DEVICE BASED ON FIBER BRAGG GRATING FABRY-PEROT CAVITY
Document Type and Number:
WIPO Patent Application WO/2020/125517
Kind Code:
A1
Abstract:
Disclosed is a sensing device based on a fiber Bragg grating Fabry-Perot cavity. The sensing device comprises a light source unit (1), a fiber circulator (2), a fiber sensing unit (3) and a spectrum detection unit (4), wherein the light source unit (1), the fiber sensing unit (3) and the spectrum detection unit (4) are respectively connected to the fiber circulator (2); the light source unit (1) comprises an actively mode-locked laser (11); the fiber sensing unit (3) is a fiber Bragg grating Fabry-Perot cavity; and an equivalent optical path of the actively mode-locked laser (11) is n 1L 1, and an equivalent optical path difference of the fiber Bragg grating Fabry-Perot cavity is 2n 2L 2, wherein formula (aa), i is a positive integer, and formula (bb). The device can effectively compensate for an optical path difference of coherent light in the fiber Bragg grating Fabry-Perot cavity to obtain interference fringes in a larger free spectral range, thereby achieving higher sensitivity and thus improving the precision of sensing measurement.
Inventors:
ZHANG LIANG (CN)
DONG YUMING (CN)
JIAO GUOHUA (CN)
LU YUANFU (CN)
CHEN WEI (CN)
LYU JIANCHENG (CN)
DONG YUMING (CN)
JIAO GUOHUA (CN)
LU YUANFU (CN)
CHEN WEI (CN)
LYU JIANCHENG (CN)
Application Number:
PCT/CN2019/124598
Publication Date:
June 25, 2020
Filing Date:
December 11, 2019
Export Citation:
Assignee:
SHENZHEN INST OF ADV TECH CAS (CN)
International Classes:
G01D5/353
Domestic Patent References:
| WO2016183321A1 | 2016-11-17 |
Foreign References:
| CN102519499A | 2012-06-27 | |||
| CN105890799A | 2016-08-24 | |||
| CN105806379A | 2016-07-27 | |||
| CN103542925A | 2014-01-29 | |||
| US20040245441A1 | 2004-12-09 |
Attorney, Agent or Firm:
MING & YUE INTELLECTUAL PROPERTY LAW FIRM (CN)
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