Interferometric sensor based on microstructured optical fiber selectively filled with functional materials

Abstract

The invention discloses an interferometric sensor based on a microstructured optical fiber selectively filled with functional materials. A birefringent microstructured optical fiber selectively filled with functional materials is used as a sensing head, and the functional materials are selectively filled into two adjacent air vent holes in the periphery of a fiber core of a refractive index guiding microstructured optical fiber in which triangular lattice air vent holes are distributed, so that birefringent fiber with a transmission mechanism of mixing refractive index and photonic band gap is realized. As null characteristic that group birefringence of the birefringent fiber is at a specific wavelength is utilized, and a transmission spectrum of a Sagnac fiber optic interferometer comprising the birefringent fiber presents a spectral characteristic different from that of a common interferometer, the interferometric sensor has superhigh response sensitivity to outside parameters. The interferometric sensor based on the microstructured optical fiber selectively filled with the functional materials has the advantages of flexibility in realizing manner and high sensing sensitivity and capability of being widely applied in high sensitivity sensing measurement of parameters such as temperature, refractive index and the like as well as manufacturing fields of optical elements such as photoswitches, tunable filters and the like.

Description

technical field [0001] The invention relates to a microstructure optical fiber sensor, in particular to a microstructure optical fiber interference type based on selective filling of functional materials, with a mixed conduction mechanism, and a temperature sensitivity of up to 35nm / ℃ (refractive index sensitivity>85,995nm / RIU). sensor. Background technique [0002] Microstructure optical fiber, also known as photonic crystal fiber or holey fiber, is a new type of optical fiber with high scientific research value and broad market application prospects that has developed rapidly in recent years. The extending air holes are distributed according to a certain law along the axial direction of the optical fiber. Microstructured fibers can be divided into two types according to different light guiding mechanisms: refractive index-guided microstructured fibers and photonic bandgap microstructured fibers. The former is similar to the light guiding mechanism of traditional optic...

AI Technical Summary

Problems solved by technology

However, in the work reported above, the introduction of functional materials did not change the conduction mechanism of the microstructured fiber, and both before and after material filling were index-guided fibers.

At present, there are no reports of ultra-high sensitivity sensors (temperature sensitivity coefficient > 10nm / ℃) based on selective filling of functional materials, with mixed conduction mechanism, and microstructure optical fiber interference type.

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