本文選題：光纖傳感器 + 球形結構　； 參考：《天津理工大學》2017年碩士論文

【摘要】：光纖傳感器是一種新型傳感器,經(jīng)過幾十年的研究和發(fā)展,光纖傳感技術在理論和實驗等方面已經(jīng)日漸趨于成熟,其中干涉型光纖傳感器由于其具有靈敏度高、制作成本低、可適應惡劣環(huán)境等優(yōu)點,使得它在航天航空、醫(yī)藥、橋梁檢測等領域有著廣闊的應用前景。本文主要是在課題組前期研究工作的基礎上,基于多模和球形結構設計制作新型的光纖傳感器,并實現(xiàn)對外界參量:溫度、折射率、磁場的測量。1、設計了一種基于多模光纖和球形結構級聯(lián)的干涉型光纖傳感結構,并對外界參量進行了測量,這種新型復合結構的透射譜是一系列干涉的疊加,測得兩個干涉谷的溫度靈敏度分別為0.053nm/℃,0.043 nm/℃;折射率靈敏度分別為-41.51nm/RIU,-59.19nm/RIU;磁場靈敏度分別為0.047nm/mT,0.077nm/mT。2、設計了一種基于偏芯結構與球形結構級聯(lián)的干涉型光纖傳感結構,并對外界參量進行了測量,該傳感結構利用偏芯結構將入射光分為兩部分,不僅激發(fā)高階纖芯模式,而且激發(fā)了不同階包層模式,再利用球形結構的耦合作用,產(chǎn)生不同模式之間的干涉。實驗測得兩個干涉谷的溫度靈敏度分別為0.042nm/℃、0.059 nm/℃;折射率靈敏度分別為-46.12nm/RIU,-54.17 nm/RIU;磁場靈敏度分別為-0.187nm/mT,-0.11nm/mT。3、設計了一種基于少模光纖和球形結構級聯(lián)的干涉型光纖傳感結構,不同于多模光纖,少模光纖參與干涉的模式數(shù)量較少,且高階模式能量比例較高,因此少模光纖較好的濾模作用可以實現(xiàn)對傳感結構的優(yōu)化。利用少模光纖特定高階纖芯模式與不同階包層模式之間的干涉形成的干涉譜,對外界參量進行了測量,溫度靈敏度分別為0.059nm/℃,0.05nm/℃;折射率靈敏度分別為-39.15nm/RIU,-48.82nm/RIU;磁場靈敏度分別為-0.090nm/mT,-0.122nm/mT。
[Abstract]:Optical fiber sensor is a new type of sensor. After decades of research and development, optical fiber sensor technology has become more and more mature in theory and experiment, among which interferometric optical fiber sensor has high sensitivity and low cost. It has a wide application prospect in aerospace, medicine, bridge detection and other fields. In this paper, a new type of optical fiber sensor is designed and fabricated based on multi-mode and spherical structure based on the previous research work of the research group, and the external parameters are realized: temperature, refractive index, In the measurement of magnetic field, an interferometric optical fiber sensing structure based on the cascade of multimode optical fiber and spherical structure is designed, and the external parameters are measured. The transmission spectrum of this new composite structure is a superposition of a series of interference. The temperature sensitivity of the two interference valleys is 0.043 nm/ 鈩，

本文編號：2028768