Interferometric optical fiber sensor based on pohotonic crystal optical fiber

Abstract

The invention discloses an interferometric optical fiber sensor based on a pohotonic crystal optical fiber. The pohotonic crystal optical fiber at the middle section is connected with monomode optical fibers at two ends via core shift connecting structures, wherein the diameters of claddings of the monomode optical fibers at two ends are 125 microns, and the diameters of fiber cores are 8.3 microns; the pohotonic crystal optical fiber at the middle section is a PM-125 type pohotonic crystal optical fiber manufactured by the fiberhome telecommunication, the cladding diameter is 125 microns, the diameter of the fiber core is 7 microns, and the length is 5cm, and the section acts as a sensing region. The interferometric optical fiber sensor is not sensitive to temperature, and is relatively high in refractive index, and can act as a refractive index sensor, and meanwhile, influences on refractive index measurement precision caused by the change of temperature can be alleviated. The interferometric optical fiber sensor based on the pohotonic crystal optical fiber is simple in structure, is easy to manufacture, meanwhile can alleviate influences on the single-parameter measurement precision by temperature, is relatively high in practical value, and is suitable for the fields of industrial production, defense-related science and technology, medical treatment, people's livehood and the like.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, in particular to an interference optical fiber sensor for photonic crystal optical fiber refractive index sensing. Background technique [0002] Sensing technology plays an important role in modern information technology. With the rapid development of modern information technology, the requirement for continuous improvement of sensing technology is becoming more and more urgent. In recent years, optical fiber sensors based on the principle of interference have been widely used in the measurement of strain, bending, refractive index, temperature, liquid level, etc. due to their advantages of high sensing sensitivity and flexible structural design. [0003] Photonic crystal fiber (PCF) is a two-dimensional optical waveguide with defects, which has many excellent properties compared with traditional optical fiber. Due to the unique properties of PCF, the application of PCF has attracted extens...

AI Technical Summary

Problems solved by technology

[0004] The measurement of refractive index is very important in industrial measurement, but there is a problem of cross-sensitivity between temperature and refractive index in general fiber optic sensors, which will affect the measurement accuracy; and the measurement sensitivity of general fiber optic sensors needs to be further improved

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