Optical fiber temperature sensing probe and demodulation method

Abstract

The invention discloses an optical fiber temperature sensing probe and a demodulation method. The optical fiber temperature sensing probe includes a first single-mode optical fiber, a hollow optical fiber, a second single-mode optical fiber, a ceramic ferrule and ultraviolet glue. One end of the hollow optical fiber is fused together with one end of the first single-mode optical fiber and the other end of the hollow optical fiber is fused together with one end of a second single-mode optical fiber, so that a reference Fabry-Perot interferometer. The other end of the second single-mode opticalfiber is inserted into one end of the ceramic ferrule. The ultraviolet glue is filled into the other end of the ceramic ferrule and is in the ceramic ferrule. The end face of the other end of the second single-mode optical fiber is spaced from the end face of the ultraviolet glue, so that a sensing Fabry-Perot interferometer is formed. The reference Fabry-Perot interferometer and the sensing Fabry-Perot interferometer are in cascaded connection so as to form a vernier effect, so that temperature detection flexibility is improved. According to the invention, the optical fiber temperature sensing probe is simple in manufacture method and low in manufacture cost and the temperature detection flexibility is improved.

Description

Technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more specifically, relates to an optical fiber temperature sensing probe and a demodulation method. Background technique [0002] Optical fibers are widely used in the sensing field due to their small size, light weight, corrosion resistance, and strong electromagnetic interference resistance. Temperature detection is an important application field of optical fiber sensing technology. Compared with traditional electronic temperature sensors, optical fiber temperature sensors can be more widely used in specific fields such as aerospace, nuclear test research, and biomedicine. [0003] Because the thermo-optical coefficient and thermal expansion coefficient of the optical fiber itself are not large, the sensitivity of optical fiber temperature sensors is generally not high. For example, optical fiber temperature sensors based on gratings (including Bragg gratings and long-period grating...

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