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Investigation on SMS Optical Fiber Sensors

Author: ZhaoFang
Tutor: QuShiLiang；GaoRenXi
School: Harbin Institute of Technology
Course: Optics
Keywords: Optical fiber sensing Refractive index sensing Multimode interference effects Self - mirror effect SMS structure
CLC: TP212.14
Type: Master's thesis
Year: 2010
Downloads: 114
Quote: 0
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Abstract


Fiber optic sensors due to their small size , light weight , immunity to electromagnetic interference , corrosion-resistant , high sensitivity , complete artificial unable to complete the task on special occasions . Its advantage has played a huge role in many areas of aerospace , military , defense . Based multimode interference in the field of fiber optic sensing and fiber optic sensors for the self - mirror effect inject new vigor and vitality , has become a focus for researchers , and has a very important practical significance and broad application prospects . Firstly, in theory analysis method for solving the electromagnetic fields of the characteristic equation in cylindrical coordinates , and draw multimode interference effect and self- location and imaging of the mirror effect , using MATLAB to simulate the coupling efficiency of the different modes in the multimode fiber obtained from mirror formula of calculation of the position . Focuses on the SMS (Single-mode-Multimode-Single-mode) structure sensing principle and related theory . Experimental Study of a temperature sensor within the range of 25 ° C to -85 ° C , to draw the traditional SMS structural sensor output power varies with temperature is not obvious . To improve sensor sensitivity the SMS sensor sensitive parts can be pasted into the bimetal experiments made ??based on the bending effect sensor . The improved SMS structure sensor having a good sensitivity in the range of 55 ° C to -70 ° C , and the output power and temperature is substantially linear change . In the the SMS structure of liquid refractive index sensor research , the paper presented the best corrosion effect by monitoring the output optical power variation . The experimental corrosion process the output power versus time relationship . By analyzing corrosion image , select a different location , using different concentrations of sodium chloride and glycerol solution was subjected to a refractive index sensing experiment , drawn after etching the refractive index of the SMS structure sensor and output power in a corresponding relationship . The experiment has highly reproducible measurement of the refractive index can be based on the actual need to select the sensitivity range .

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