本文選題：光纖傳感器 + 光纖馬赫-曾德爾(MZ)干涉儀　； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：自從石英光纖出現(xiàn)以后,基于光纖的各項(xiàng)技術(shù)就順勢(shì)而生并且在短時(shí)間內(nèi)得到了全面而迅速的發(fā)展。光纖的特殊性能使得它在傳感和通信領(lǐng)域都扮演著舉足輕重的作用。長(zhǎng)久以來因?yàn)楣饫w類傳感器擁有其他類傳感器件不具備的許多優(yōu)點(diǎn)而得到了科研人員的廣泛關(guān)注。這些優(yōu)點(diǎn)包括光纖傳感器的尺寸較小、響應(yīng)速度較快、能抗電磁干擾等等。目前常見的光纖傳感器主要分為兩類,即光纖干涉儀類傳感器和光纖光柵類傳感器。而光纖干涉儀類傳感器相對(duì)于光纖光柵類傳感器具有更高的靈敏度和更低的制備成本而被廣泛應(yīng)用到工程健康監(jiān)測(cè)中。其中,作為光纖干涉儀類傳感器中重要的一個(gè)分支,最近幾年研究者們提出了多種基于新結(jié)構(gòu)的光纖馬赫-曾德爾(MZ)干涉儀傳感器。論文通過利用光纖熔接機(jī)熔融,手動(dòng)旋轉(zhuǎn)光纖一端的方法制備了基于雙螺旋結(jié)構(gòu)(DHS)的MZ干涉儀光纖傳感器。制備過程為通過先把一段去掉涂覆層并且用酒精棉擦拭干凈的標(biāo)準(zhǔn)康寧單模光纖(SMF-28e)放置在光纖熔接機(jī)(Ericsson FSU-975)中,然后將光纖熔接機(jī)的程序重新設(shè)定為只放電不熔接程序,光纖的一端用熔接機(jī)自帶的光纖夾具固定,另一端可以自由旋轉(zhuǎn),在放電的過程中手動(dòng)旋轉(zhuǎn)沒有被固定的單模光纖的一端,最終形成一個(gè)螺旋結(jié)構(gòu),這個(gè)結(jié)構(gòu)的形貌可以通過熔接機(jī)自帶的CCD觀察。再通過的同樣的方式可以在同一根光纖上制備另一個(gè)螺旋結(jié)構(gòu),兩個(gè)螺旋結(jié)構(gòu)主要扮演著耦合器的作用。文中制備的這種全單模光纖結(jié)構(gòu)的MZ干涉儀的兩個(gè)螺旋結(jié)構(gòu)的長(zhǎng)度為7mm,且制備的器件沒有改變光纖原有的直徑,因此保證了光纖良好的機(jī)械強(qiáng)度。我們通過實(shí)驗(yàn)的方式測(cè)試了所制備的干涉儀的彎曲傳感特性,得到干涉儀的透射光譜隨著彎曲曲率的增加而藍(lán)移并且彎曲靈敏度隨彎曲曲率的增加呈現(xiàn)良好的線性關(guān)系。對(duì)于λ=1520 nm處的透射峰,在彎曲曲率從0.5m-1變化到3.059m-1時(shí),實(shí)驗(yàn)得到的最大靈敏度為-35.27nm/m-1,同時(shí)我們做了3次彎曲重復(fù)實(shí)驗(yàn),得出3次測(cè)試的結(jié)果基本一致,說明器件測(cè)試的可重復(fù)性,其次我們測(cè)試了當(dāng)曲率從小變化到大和曲率從大變化到小的情況,得知兩種測(cè)試情況對(duì)器件的彎曲靈敏度沒有影響,所以該器件的彎曲靈敏度較高,且可以重復(fù)測(cè)量使用。另外,我們對(duì)器件溫度的傳感響應(yīng)特性也進(jìn)行了測(cè)試,在外界溫度為30℃-90℃范圍內(nèi),器件的溫度靈敏度僅為63pm/℃。并對(duì)器件做了交叉靈敏度分析,得到外界溫度的變化對(duì)器件的彎曲靈敏度的交叉靈敏度為0.0018m-1/℃,所以該傳感器件的溫度交叉靈敏度較低,可以較好的作為彎曲傳感器使用。因?yàn)檫@種干涉儀的制備過程非常簡(jiǎn)單、成本低、彎曲靈敏度高、溫度對(duì)彎曲測(cè)試影響小等特點(diǎn),使得它在工程健康監(jiān)測(cè)領(lǐng)域擁有廣泛的市場(chǎng)前景。
[Abstract]:Since the emergence of quartz optical fiber, fiber-based technologies have come into being in a short period of time and have been fully and rapidly developed. The special performance of optical fiber makes it play an important role in the field of sensing and communication. For a long time, optical fiber sensors have many advantages that other sensor devices do not have. These advantages include the smaller size of the fiber sensor, the faster response speed, the ability to resist electromagnetic interference and so on. At present, there are two kinds of optical fiber sensors: fiber optic interferometer and fiber Bragg grating. Compared with fiber Bragg grating sensors, fiber optic interferometer sensors are widely used in engineering health monitoring because of their higher sensitivity and lower fabrication cost. In recent years, as an important branch of optical fiber interferometer sensors, researchers have proposed a variety of optical fiber Mach Zehnder MZ interferometer sensors based on a new structure. In this paper, the MZ interferometer optical fiber sensor based on double helix structure (DHS) is fabricated by using fiber fusion machine to melt and manually rotate one end of the fiber. The preparation process is to first remove the coating and wipe it with alcohol cotton in the fiber fusion machine Ericsson FSU-975) and then reset the procedure of the optical fiber fusion machine to discharge only non-weld procedure. One end of the fiber is fixed by the fiber-optic clamp brought by the welding machine, the other end is rotated freely, and one end of the unfixed single-mode fiber is manually rotated during the discharge process, and finally a spiral structure is formed. The morphology of the structure can be observed by CCD with the welding machine. In the same way, another helical structure can be fabricated on the same fiber. The two helical structures mainly act as couplers. The length of the two helical structures of the MZ interferometer is 7mm, and the fabricated device does not change the original diameter of the fiber, thus ensuring the good mechanical strength of the fiber. The bending sensing characteristics of the prepared interferometer are tested experimentally. It is found that the transmission spectrum of the interferometer moves blue with the increase of the curvature and the sensitivity of the interferometer shows a good linear relationship with the increase of the curvature of the interferometer. For the transmission peak at 1520 nm, the maximum sensitivity of the experiment is -35.27 nm / m ~ (-1) when the bending curvature changes from 0.5m-1 to 3.059m-1. At the same time, we have done three bending repeated experiments, and the results of three times are basically consistent, which shows the repeatability of the device test. Secondly, when curvature changes from small to large and curvature changes from large to small, we find that the two kinds of test conditions have no effect on the bending sensitivity of the device, so the bending sensitivity of the device is high and can be used repeatedly. In addition, the temperature sensing response of the device is also tested. The temperature sensitivity of the device is only 63pm/ 鈩，

本文編號(hào)：1928122