Temperature sensor based on double-core single-hole optical fiber

Abstract

The invention provides a temperature sensor based on a double-core single-hole optical fiber. The temperature sensor is characterized in that a light source 1 is connected with the port 1 of an optical circulator 3 through a single-mode optical fiber 2-1, the port 2 of the optical circulator 3 is connected with an optical fiber sensing probe 5 through a single-mode optical fiber 2-2, and the port3 of the optical circulator 3 is connected with a spectrum analyzer 4 through a single-mode optical fiber 2-3. The optical fiber sensing probe 5 is composed of a Michelson interferometer and comprisesa single-mode optical fiber, a double-core optical fiber, a double-core single-hole optical fiber and a reflecting film, wherein the hole of the double-core single-hole optical fiber isfilled with liquid with high thermo-optical coefficients, the two ends of the double-core single-hole optical fiber are respectively welded with a section of double-core optical fiber in a core-to-core manner, thedouble-core optical fiber at one end is welded with the single-mode optical fiber, the end surface of the double-core optical fiber at the other end is plated with the reflecting film, and the manufacturing of the Michelson interferometer is completed by tapering the welding part of the single-mode optical fiber and the double-core optical fiber. According to the temperature sensor, the temperature measurement is achieved through the interference of the transmission light in the two fiber cores of the double-core single-hole optical fiber, the structure is simple, and the sensitivity is high.

Description

[0001] (1) Technical field [0002] The invention relates to an optical fiber temperature sensor, in particular to a temperature sensor based on a double-core single-hole optical fiber, and belongs to the technical field of optical fiber sensing. [0003] (2) Background technology [0004] Optical fiber sensing technology is a sensing technology based on the principle of guided wave, using optical fiber as the transmission medium or sensor device, and light wave as the carrier. With the development of optical fiber communication technology, great progress has been made in sensing principle, sensing structure, equipment manufacturing technology, etc., and various new optical fiber sensors have been developed. Compared with traditional electromagnetic sensors, optical fiber sensors have the characteristics of anti-electromagnetic interference, light weight, chemical corrosion resistance, and fast response, and optical fiber sensors can be used to measure parameters such as temper...

AI Technical Summary

Problems solved by technology

For example, in 2011, M. Yang et al. (fiber in-line Mach-Zehnder interferometer constructed by selective infiltration of two air holes inphotonic crystal fiber) proposed that the air holes of photonic crystal fibers be selectively filled with liquid to form a Mach-Zehnder interferometer. Interferometer, in order to complete the temperature detection, but this method needs to fill the specific air hole of the photonic crystal fiber, which is difficult to operate

In 2018, Tianmian Zhou et al. (low cost non-adiabatic tapered fiber for high-sensitive temperature sensing) proposed to make a temperature sensor by drawing a taper on a single-mode fiber, and intermode interference at the fiber taper to detect temperature, but The fiber optic cone is relatively fragile as a sensing part, and it is easy to break the fiber optic cone due to external factors, and the temperature sensor made by this method has low sensitivity

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