本文選題：光纖傳感器　切入點：模間干涉　出處：《安徽大學》2016年碩士論文　論文類型：學位論文

【摘要】：基于模間干涉原理的光纖傳感器是近些年提出的一種新型光纖傳感器。模間干涉型光纖傳感器具有靈敏度高、耐腐蝕、質輕、小巧、抗電磁干擾、集傳感和傳輸于一體、能與光纖通信系統(tǒng)兼容等優(yōu)點。相較于傳統(tǒng)干涉型光纖傳感器,模間干涉型光纖傳感器僅需單根光纖即可實現(xiàn)不同模式光間的干涉,結構更為緊湊,實現(xiàn)了對光路的進一步簡化,且對光源沒有嚴格的要求。隨著技術的不斷發(fā)展,模間干涉型光纖傳感器在大型發(fā)電機組、邊界安防、橋梁大壩安全監(jiān)測以及航天航空器運行狀態(tài)監(jiān)測等領域將有很大的應用潛力。本論文主要設計了兩種不同類型的模間干涉型光纖傳感器,并對其特性進行了研究。全文的主要內容如下：第一章為緒論部分。介紹了光纖傳感器的發(fā)展概況、應用、分類以及模間干涉技術的研究現(xiàn)狀,并概括了本論文的主要內容與創(chuàng)新點。第二章為模間干涉型光纖傳感器的基本理論探究。介紹了光干涉技術的基本原理、光纖中的模式干涉理論以及保偏光纖中兩正交偏振模的干涉理論。第三章介紹了一種“無芯光纖-多模光纖-無芯光纖(NMN)”結構模間干涉光纖傳感器。理論上分析了該傳感器的傳感原理,并用Rsoft軟件對該傳感器的內部光場分布進行了仿真模擬,研究了不同長度的無芯光纖對傳感器內部光場分布的影響。最后對該傳感器的溫度和折射率傳感特性進行了實驗研究。第四章介紹了一種偏振模干涉型光纖扭轉傳感器。該傳感器基于Sloc干涉原理,利用電場矢量方向在完全圓對稱的標準單模光纖中傳輸時不受扭轉影響這一特性設計而成。在分析其傳感原理后,利用軟件對該傳感器的扭轉特性進行了模擬。該傳感器實際的扭轉測量結果經(jīng)修正后與模擬結果基本一致,扭轉靈敏度最高可達-0.79dB/。,同時還可實現(xiàn)扭轉方向的判斷。此外,我們對該傳感器的溫度響應特性也進行了實驗研究,計算出由溫度變化而導致的扭轉測量誤差最大僅為0.04。／℃。
[Abstract]:The optical fiber sensor based on the principle of intermodal interference is a new type of optical fiber sensor proposed in recent years. The optical fiber sensor with high sensitivity, corrosion resistance, light weight, small size, anti-electromagnetic interference, is integrated with sensor and transmission. Compared with the traditional interferometric optical fiber sensor, the intermodal interferometric optical fiber sensor can realize the interference between different modes of light with a single optical fiber, and the structure is more compact. With the development of technology, the intermodal interference optical fiber sensor is used in large generator set, and the boundary is protected. There will be great application potential in the field of bridge and dam safety monitoring and spaceflight aircraft operating state monitoring. In this paper, two kinds of intermodal interference optical fiber sensors are designed. The main contents of this paper are as follows: the first chapter is the introduction. The development, application, classification and intermodal interference of optical fiber sensors are introduced. The main contents and innovations of this paper are summarized. Chapter 2 is the basic theory of intermodal interferometric optical fiber sensor. The basic principle of optical interferometry is introduced. Mode interference theory in optical fiber and interference theory of two orthogonal polarization modes in polarization-maintaining fiber. Chapter 3 introduces an intermodal interference optical fiber sensor with "coreless fiber-multi-mode fiber-coreless fiber" structure. The sensing principle of the sensor, The internal light field distribution of the sensor is simulated with Rsoft software. The influence of coreless fiber with different lengths on the optical field distribution inside the sensor is studied. Finally, the temperature and refractive index sensing characteristics of the sensor are experimentally studied. In chapter 4th, a polarization mode interferometric fiber torsion is introduced. The sensor is based on the principle of Sloc interference. The electric field vector direction is designed by using the characteristic that the direction of electric field is transmitted in a perfectly circular symmetric standard single-mode fiber without torsional influence. After analyzing its sensing principle, The torsional characteristics of the sensor are simulated by software. The measured results of the sensor are in good agreement with the simulation results. The torsional sensitivity of the sensor is up to -0.79 dB /%, and the direction of torsion can also be judged. The temperature response characteristics of the sensor are also studied experimentally, and it is found that the maximum torsional measurement error caused by the temperature change is only 0.04 / 鈩，

本文編號：1581065