Unpolarized interference high-sensitivity photonic crystal fiber temperature sensor and manufacturing method thereof

Abstract

The invention provides an unpolarized interference high-sensitivity photonic crystal fiber temperature sensor which comprises a small section of photonic crystal fiber and single mode fibers which are connected, wherein the photonic crystal fiber is arranged in the middle section and filled with high thermo-optical coefficient liquid, the single mode fibers are arranged at two ends and the high thermo-optical coefficient liquid does not contact with the outside directly; the used photonic crystal fiber comprises a solid core and an air cladding, the high thermo-optical coefficient liquid is sealed in the air cladding of the photonic crystal fiber and has a length between several millimeters and dozens of millimeters. According to the manufacturing method of the unpolarized interference high-sensitivity photonic crystal fiber temperature sensor, common single mode fibers are used for input / output light guide of the fiber temperature sensor, a small section of photonic crystal fiber filled with the high thermo-optical coefficient liquid is welded between the single mode fibers by adopting an arc welding method, the high thermo-optical coefficient liquid is sealed in the photonic crystal fiber and does not contact with the outside. The unpolarized interference high-sensitivity photonic crystal fiber temperature sensor has novel design, is feasible to manufacture, and has a wide application prospect in the fields such as fiber sensing and the like. At present, temperature sensitivity obtained by using isopropanol is 103.7pm / DEG C.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to the research and preparation of optical fiber sensors. More specifically, a high-sensitivity photonic crystal fiber interference temperature sensor is prepared by pouring a liquid with a high thermo-optic coefficient into the photonic crystal fiber and then fusing it with a single-mode fiber. Background technique [0002] Optical fiber sensing is a new technology that came out in the 1970s. It is a sensing technology that uses light as the information carrier and optical fiber as the information transmission medium. Compared with traditional sensors, optical fiber sensors have the advantages of small size, light weight, no electromagnetic interference, and high sensitivity. Since the advent of low-loss optical fibers in the 1970s, it has gradually become one of the research and development directions of new-generation sensors. A very good application prospect. In recent...

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Problems solved by technology

However, since the photonic crystal fiber is composed of a single material and its thermo-optic coefficient is very small, its temperature sensitivity is very low. Generally, the temperature sensitivity of the non-polarization interference device based on photonic crystal fiber is less than 10pm / ℃, so it cannot be used to prepare Temperature sensor, which also limits the application of photonic crystal fiber to a certain extent

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