Optical fiber Fabry-Perot temperature sensing head based on PDMS arc-shaped reflecting surface and preparation method of optical fiber Fabry-Perot temperature sensing head

Abstract

The invention discloses an optical fiber Fabry-Perot temperature sensing head based on a PDMS arc-shaped reflecting surface and a preparation method of the optical fiber Fabry-Perot temperature sensing head. The sensing head comprises a single-mode optical fiber (1) and a microtube (2) arranged at the tail end of the single-mode optical fiber (1) in a welding manner; the microtube (2) is filled with PDMS (3); the microtube (2) filled with the polymer PDMS (3) forms a Fabry-Perot cavity; and an arc-shaped reflecting surface is formed at the tail end of the polymer PDMS (3). Compared with the prior art, the temperature sensitivity of the sensing head is improved by nearly 7.33 times compared with that of an unconstrained condition; the temperature sensitivity is controlled by controlling the length of the PDMS or the radian of the end face of the PDMS, and the smaller the length of the filled polymer PDMS is, the larger the radian of the arc-shaped end face is, and the higher the temperature sensitivity of the sensing head is; the sensing head has the advantages of being small in size, high in sensitivity, simple in structure, easy to manufacture and the like.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a novel high-sensitivity optical fiber F-P temperature sensing measurement system and measurement method based on a PDMS arc reflective surface. Background technique [0002] The rapid development of science and technology has brought a lot of convenience to production and life, but it has also brought serious environmental pollution, such as global warming; in addition, in power systems, detection systems, etc., temperature has always been an indispensable factor. Due to its own structure, the electrical temperature sensing head cannot be used in environments with strong corrosion or electromagnetic interference. In order to solve these problems, fiber optic temperature sensing heads based on different principles have been proposed in recent years, such as fiber grating type, Ma Zeng interference type, Fapling interference type, etc. Among them, the fiber-optic F...

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Problems solved by technology

[0003] In order to overcome the deficiencies of the existing sensor heads, such as easy polymer shedding, poor interference contrast, and low temperature sensitivity, the present invention proposes a fiber-optic F-P temperature sensor head based on a PDMS curved reflective surface and its preparation method , using the capillary phenomenon, the polymer PDMS is filled in the microtube, and the arc-shaped reflective surface is introduced to limit the radial deformation of the PDMS, thereby increasing its axial deformation and further improving the sensitivity of temperature measurement

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