本文關(guān)鍵詞：基于光纖倏逝場的折射率傳感研究　出處：《安徽大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 熊貓型保偏光纖 應(yīng)力區(qū)缺失 倏逝場 折射率測量

【摘要】：將光纖傳感技術(shù)應(yīng)用于液體折射率測量已成為近年來光纖傳感應(yīng)用的一個熱點。光纖折射率傳感探頭可設(shè)計為光纖光柵、F-P腔、多模、微納光纖等結(jié)構(gòu),具有體積小、重量輕、靈敏度高、抗電磁干擾、抗高溫高壓以及耐腐蝕等特點,在生物、醫(yī)藥、食品等領(lǐng)域展現(xiàn)出誘人的發(fā)展前景。本文以熊貓型保偏光纖為研究對象,通過選擇性腐蝕方法制備了一種應(yīng)力區(qū)缺失光纖結(jié)構(gòu),獲得了偏振相關(guān)的倏逝場,并利用保偏光纖正交偏振模干涉技術(shù)對這種應(yīng)力區(qū)缺失光纖結(jié)構(gòu)的折射率傳感特性進行研究。論文所開展的主要工作有：總結(jié)分析了當(dāng)前用于液體折射率測量的典型光纖傳感技術(shù),指出將光纖技術(shù)應(yīng)用于液體折射率測量的意義及優(yōu)勢；理論研究了基于光纖倏逝場的折射率傳感原理,分析了保偏光纖傳輸特性,構(gòu)建了一種熊貓型保偏光纖應(yīng)力區(qū)缺失結(jié)構(gòu)并分析了其倏逝場特性以及關(guān)鍵光學(xué)參量的測試方法。結(jié)合腐蝕工藝,利用不同材料被腐蝕時速度上的差異實現(xiàn)對熊貓型保偏光纖選擇性腐蝕；實驗研究了熊貓型保偏光纖應(yīng)力區(qū)缺失結(jié)構(gòu)的制備方法,以及應(yīng)力區(qū)缺失過程中熊貓型保偏光纖雙折射的變化；基于保偏光纖正交偏振模干涉理論,研究了外界折射率、溫度變化時對這種結(jié)構(gòu)光學(xué)傳輸特性的影響。研究結(jié)果表明,這種應(yīng)力區(qū)缺失光纖結(jié)構(gòu)具有明顯的形狀雙折射特性,是一種性能較好的折射率傳感探頭,具有很高的傳感靈敏度,且制備過程簡單、成本低,在液體折射率傳感領(lǐng)域有極高的應(yīng)用潛力。
[Abstract]:The application of optical fiber sensing technology in liquid refractive index measurement has become a hot spot in recent years. The fiber refractive index sensor can be designed as fiber grating F-P cavity, multi-mode, micro-nano fiber and other structures. With small size, light weight, high sensitivity, resistance to electromagnetic interference, high temperature and high pressure, corrosion resistance and so on, in biology, medicine. In this paper, panda type polarization maintaining fiber is taken as the research object, a kind of missing fiber structure in stress region is prepared by selective etching method, and polarization dependent evanescent field is obtained. The refractive index sensing characteristics of this stress region missing fiber structure are studied by polarization maintaining fiber orthogonal polarization mode interferometry. The main work of this paper is as follows:. The typical optical fiber sensing techniques used in liquid refractive index measurement are summarized and analyzed. The significance and advantages of using fiber technology in liquid refractive index measurement are pointed out. The principle of refractive index sensing based on evanescent field of optical fiber is studied theoretically, and the transmission characteristics of polarization maintaining fiber are analyzed. A missing structure in stress region of panda type polarization maintaining fiber was constructed and its evanescent field characteristics and key optical parameters were analyzed. The selective corrosion of panda type polarization maintaining fiber is realized by using the difference of speed when different materials are corroded. The fabrication method of the missing structure of the stress region of panda type polarization maintaining fiber and the change of birefringence of the panda type polarization maintaining fiber during the process of the loss of the stress region are studied experimentally. Based on the polarization-maintaining fiber orthogonal polarization mode interferometry, the effects of external refractive index and temperature on the optical transmission characteristics of this structure are studied. This kind of missing fiber structure has obvious shape birefringence characteristic, it is a kind of refractive index sensor with better performance, and has high sensitivity, simple preparation process and low cost. It has high application potential in the field of liquid refractive index sensing.
【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN253

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本文編號：1430143