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Research and Fabrication of Long Period Fiber Grating Refraction Index Sensor

Author: YangRuiZhu
Tutor: SunHongBo；QianYing；DongWenFei
School: Jilin University
Course: Microelectronics and Solid State Electronics
Keywords: Long period fiber grating The electrostatic layers of self-assembled Refractive index sensor
CLC: TP212
Type: Master's thesis
Year: 2009
Downloads: 230
Quote: 1
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Abstract


This paper briefly describes the development and application of fiber gratings, as on the the fiber grating latest developed a new type of device - long period fiber grating sensor development and research status quo brief description. Long period fiber grating guided modes of the core and cladding modes characteristic equation is derived using the coupled mode theory, and then use this equation to solve the effective refractive index of the guided mode and cladding modes. At the same time, the analysis of the spectral characteristics of long period fiber grating obtained the parameters of the impact of long-period fiber grating spectral characteristics and meet the requirements of long period fiber grating refractive index sensors provide a theoretical basis for the preparation. In addition, a brief the electrostatic layer self-assembly principle and significance, the method and basis for the modification of the cladding of the fiber grating. Meanwhile, long period fiber grating sensing characteristics explain the key points in the refractive index sensing characteristics of long period fiber grating to study the impact of the external environment, the refractive index of the transmission spectrum of the long period fiber grating and its applications in the areas of sensing . During the experiment, a brief production of long period fiber grating more mature approach - UV written law, mainly using the amplitude mask Edition fiber UV exposure. Then HF etching method is modulated so that the radius of the fiber cladding long period fiber grating initially reached a sensitive area. The gate region and the layers using an electrostatic method of self-assembled polyelectrolyte multilayers modification, and was measured in the assembly process of the five kinds of media: air, water, methanol, ethanol, isopropanol, and five kinds medium fiber grating resonant wavelength with the curve of the assembled layers, and found that the variation is good agreement with the theoretical analysis. The polyelectrolyte material for electrostatic layer self-assembly for PAH-PSS layer - by - layer self - assembly (SA)-PSS analysis long period fiber grating the two groups polyelectrolyte material assembled by the changes in transmission spectra, obtained assembly of polyelectrolyte layer film refractive index of the sensitivity and selectivity of the sensor has improved significantly long period fiber grating. And help to improve the characteristics of the fiber grating sensitivity to the refractive index of the film, drawn from the comparative analysis of the two groups polyelectrolyte materials for further study of high sensitivity, high selectivity long period fiber grating refractive index sensors provide the basis.

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