本文選題：光纖光柵傳感器　切入點(diǎn)：光纖Bragg光柵　出處：《北京交通大學(xué)》2017年碩士論文

【摘要】：光纖Bragg光柵(FBG)作為一種新型全光纖無源器件,以其獨(dú)特的優(yōu)點(diǎn),在光纖通信以及傳感領(lǐng)域均扮演了十分重要的角色。隨著光纖光柵傳感器的不斷成熟和發(fā)展,多參數(shù)測(cè)量以及解調(diào)技術(shù)成為了目前光纖光柵傳感系統(tǒng)的主要研究熱點(diǎn)。因此,本文對(duì)光纖Bragg光柵溫度、軸向拉力傳感特性以及解調(diào)技術(shù)進(jìn)行了研究。論文主要完成了以下工作:(1)論文針對(duì)光纖光柵的定義和分類做了詳細(xì)的介紹;在分析光纖Bragg光柵的軸向應(yīng)變、拉力和溫度傳感機(jī)理的基礎(chǔ)上,理論上研究了光纖Bragg光柵的應(yīng)變-溫度交叉敏感問題。(2)針對(duì)傳統(tǒng)寬帶光源傳感系統(tǒng)解調(diào)部分比較復(fù)雜,搭建了基于線性掃頻光源的光纖光柵傳感系統(tǒng),其解調(diào)信號(hào)可通過傳感光柵與參考光柵的反射信號(hào)時(shí)間間隔的變化再利用掃頻激光器的掃頻速率得到。(3)用單個(gè)傳感光柵分別對(duì)在水浴中和空氣中的溫度傳感特性以及拉力傳感特性進(jìn)行了實(shí)驗(yàn)研究,發(fā)現(xiàn)光纖Bragg光柵的溫度和拉力傳感特性都保持著較好的線性關(guān)系,只是其在水浴中的溫度敏感系數(shù)要比空氣中的大,分析了影響系統(tǒng)溫度和拉力靈敏度的因素。最后用三個(gè)光纖Bragg光柵實(shí)現(xiàn)了溫度與軸向拉力的同時(shí)測(cè)量,并對(duì)實(shí)驗(yàn)所得的結(jié)果進(jìn)行了分析和比較,證明了該實(shí)驗(yàn)系統(tǒng)可單獨(dú)或同時(shí)對(duì)溫度和拉力(應(yīng)變)進(jìn)行測(cè)量。
[Abstract]:As a new type of all-fiber passive device, fiber Bragg grating (FBG) plays a very important role in the field of optical fiber communication and sensing with its unique advantages. Multi-parameter measurement and demodulation technology have become the main research focus of fiber Bragg grating sensing system. Therefore, the temperature of fiber Bragg grating is studied in this paper. The axial tension sensing characteristics and demodulation techniques are studied in this paper. The following work is accomplished: 1) the definition and classification of fiber Bragg gratings are introduced in detail, and the axial strain of fiber Bragg gratings is analyzed. Based on the sensing mechanism of tension and temperature, the strain-temperature cross-sensitivity of fiber Bragg grating is studied theoretically. The fiber Bragg grating sensing system based on linear sweep light source is built. The demodulated signal can be obtained by changing the time interval between the reflection signal of the sensing grating and the reference grating, and using the sweep rate of the sweep frequency laser to obtain the temperature sensing characteristics of the single sensing grating in the water bath and the air, respectively. And the characteristics of tensile force sensing are studied experimentally. It is found that the temperature and tension sensing characteristics of fiber Bragg gratings have a good linear relationship, but the temperature sensitivity coefficient in water bath is larger than that in air. The factors influencing the temperature and tension sensitivity of the system are analyzed. Finally, the temperature and axial tension are measured simultaneously by using three fiber Bragg gratings, and the experimental results are analyzed and compared. It is proved that the system can measure temperature and tension (strain) individually or simultaneously.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN253;TP212

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