本文選題：保偏光纖 + 光纖傳感　； 參考：《中國計(jì)量學(xué)院》2015年碩士論文

【摘要】：科技的不斷發(fā)展,工業(yè)的自動(dòng)化程度也在不斷提高,液位信息采集在許多領(lǐng)域也變得尤為重要,光纖液位傳感器由于其優(yōu)良性能而倍受青睞。本文重點(diǎn)對基于保偏光纖纖芯錯(cuò)位熔接結(jié)構(gòu)的液位傳感器進(jìn)行了相關(guān)研究以及實(shí)驗(yàn),以期獲得更高傳感性能,本論文的工作總結(jié)主要?dú)w納如下：1、簡述液位傳感器發(fā)展?fàn)顩r和光纖液位傳感器研究現(xiàn)狀。2、闡述光纖偏振特性及其模間干涉的基本原理。首先闡述了光纖模式理論,然后簡述了偏振光和單模光纖雙折射特性及保偏光纖,最后對Mach-Zehnder光纖干涉儀的模間干涉理論進(jìn)行了概述。3、提出了一種基于保偏光纖錯(cuò)位熔接的液位傳感器。利用單模光纖-保偏光纖-單模光纖組成三明治型結(jié)構(gòu),對錯(cuò)位偏移量的大小及纖芯錯(cuò)位方向(快軸、慢軸及快慢軸45。方向?qū)?zhǔn))進(jìn)行了實(shí)驗(yàn)分析,制作了一種沿其快軸錯(cuò)位對準(zhǔn)方式的干涉儀。通過干涉儀分束端的錯(cuò)位結(jié)構(gòu)激發(fā)產(chǎn)生的包層模作為探測信號接收液位信息的變化,最后通過實(shí)驗(yàn)數(shù)據(jù)擬合后得到的其波長漂移和光強(qiáng)變化對應(yīng)靈敏度分別為-0.4956nm/mm和0.2204dB/mm,溫度分析得出其靈敏系數(shù)約是13pm/℃。4、對多邊形光纖擾模進(jìn)行了模擬分析。闡述了天文觀測中多模光纖的應(yīng)用及多模光纖的基本理論,通過對正四邊形纖芯光纖和正八邊形纖芯光纖的模式模擬,分析驗(yàn)證了其在擾模中的優(yōu)良性能以及與擾模相關(guān)的光纖參數(shù)關(guān)系。
[Abstract]:With the development of science and technology, the degree of automation of industry is also increasing, and the level information collection is becoming more and more important in many fields. Fiber optic liquid level sensor is very popular because of its excellent performance. This paper focuses on the research and experiment of liquid level sensor based on polarization maintaining fiber core dislocation welding structure in order to obtain higher sensing performance. The main work of this thesis is summarized as follows: 1. The development of liquid level sensor and the research status of optical fiber liquid level sensor are briefly described. The polarization characteristics of optical fiber and the basic principle of intermode interference are expounded. Firstly, the theory of optical fiber mode is introduced, and then the birefringence characteristics of polarized light and single-mode fiber and polarization maintaining fiber are briefly described. Finally, the intermodal interference theory of Mach-Zehnder fiber interferometer is summarized, and a liquid level sensor based on polarization maintaining fiber dislocation welding is proposed. The sandwich structure is made up of single mode fiber, polarization maintaining fiber and single mode fiber. The size of the offset and the direction of the core dislocation (fast axis, slow axis and fast and slow axis 45) are analyzed. An interferometer with misalignment along its fast axis is made. The cladding mode generated by the misalignment structure at the beam splitting end of the interferometer is used as the detection signal to receive the change of liquid level information. Finally, the corresponding sensitivities of wavelength drift and light intensity are -0.4956nm / mm and 0.2204dB / mm. the sensitivity coefficient is about 13pm/ 鈩，

本文編號：1835385