Reflective air pressure sensor and manufacturing method thereof
A kind of air pressure sensor, reflective technology, applied in the direction of fluid pressure measurement, instrument, and fluid pressure measurement using optical methods, it can solve the problems of high requirements on diaphragm deformation characteristics, complicated calculation process, etc., and achieves compact structure and integration. High, simplified structure
Pending Publication Date: 2022-02-25
HARBIN ENG UNIV
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Problems solved by technology
Deformation needs to calculate the deformation distance of the center of the reflective diaphragm, and then calculate the pressure to be measured acting on the system through the deformation characteristics of the diaphragm. The requirements for the deformation characteristics of the diaphragm are high, and the calculation process is cumbersome and complicated
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0026] combine figure 1 and image 3 , the optical fiber air pressure sensor of the present invention is composed of a section of heterogeneous double suspended core optical fiber and a refractive index matching liquid. The heterogeneous double suspended core optical fiber 1 is composed of a central air hole 2, a small suspended core 3, a large suspended core 4 and an annular cladding 5, the diameter of the small suspended core 1 is smaller than that of the large suspended core 2 , the refractive index and diameter of the two suspended cores are different. The small suspended fiber core 3 and the large suspended fiber core 4 are located on the inner walls on both sides of the central air hole 2 . The refractive index matching liquid 6 is filled in the central air hole 2 using droplet microfluidic technology, and has a certain distance from b...
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Abstract
The invention discloses a reflective air pressure sensor and a manufacturing method thereof. The reflective air pressure sensor comprises a heterogeneous double-suspension core optical fiber (1) and a refractive index matching liquid (6), the heterogeneous double-suspension core optical fiber (1) comprises an air hole (2), a small suspension fiber core (3), a large suspension fiber core (4) and a cladding (5), and the small suspension fiber core (3) and the large suspension fiber core (4) are respectively and tightly attached to the inner wall of the air hole (2); the refractive index matching liquid (6) is filled in the air hole (2), an air hole port at one end of the heterogeneous double-suspension core optical fiber (1) is in a sealed state, and the small suspension fiber core (3) at the other end of the heterogeneous double-suspension core optical fiber (1) is connected with a fiber core of the single-mode optical fiber (9); an air hole between the refractive index matching liquid (6) and the single-mode optical fiber (9) is sealed, and the side wall of the optical fiber between the refractive index matching liquid (6) and the port of the sealed air hole is provided with a micropore (7). The reflective air pressure sensor is compact in structure and high in integration level, and the accurate measurement of air pressure can be realized by detecting the drift distance of an interference peak.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and relates to a reflective air pressure sensor and a manufacturing method thereof, in particular to a reflective air pressure sensor based on a heterogeneous double suspended core optical fiber and a manufacturing method thereof. Background technique [0002] The traditional air pressure measuring device is generally an electronic air pressure sensor. Because of its simple structure design, convenient manufacture and more accurate measurement of atmospheric pressure and other data, it has a wide range of applications. However, traditional electronic sensors have poor adaptability to harsh environments. For example, capacitive air pressure sensors are easily interfered by complex electromagnetic environments, resulting in unstable output results or even failure to work. Certain shielding methods must be used. Optical fiber sensors are naturally resistant to electromagnetic interfere...
Claims
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IPC IPC(8): G01L11/02G02B6/25G02B6/255
CPCG01L11/025G02B6/255G02B6/25
Inventor 杨菁邹凤叶鹏才林汇朱正史金辉关春颖
Owner HARBIN ENG UNIV