本文選題：光纖光柵 + 長(zhǎng)周期光纖光柵��； 參考：《深圳大學(xué)》2015年碩士論文

【摘要】：光纖光柵是一種使用一定方法使光纖纖芯的折射率在軸向上周期性變化而形成的衍射光柵,具有體積小、波長(zhǎng)可選擇、不受非線性效應(yīng)影響、抗電磁干擾能力強(qiáng)、同光纖通信系統(tǒng)連接損耗低等優(yōu)點(diǎn)。在光纖通信和光纖傳感領(lǐng)域受到極大的關(guān)注,成為光纖領(lǐng)域的研究熱點(diǎn)。很多工業(yè)自控環(huán)境,如水利水位、石化管道、油井以及氣體管道壓力等,都需要長(zhǎng)期實(shí)時(shí)的壓力測(cè)試,將長(zhǎng)周期光纖光柵應(yīng)用于壓力傳感方面的研究正在不斷深入之中。本文以感生式長(zhǎng)周期光纖光柵為壓力傳感元件,提出了一種感生長(zhǎng)周期光纖光柵和普通長(zhǎng)周期光纖光柵相級(jí)聯(lián)的結(jié)構(gòu),該結(jié)構(gòu)利用干涉原理,可大大提高壓力傳感的靈敏度。本論文主要完成了以下方面的研究工作并取得了若干創(chuàng)新性的成果。首先介紹了光纖光柵的分類以及相應(yīng)光譜特性,總結(jié)了光纖光柵在通信和傳感中的應(yīng)用。其次從麥克斯韋方程組入手,詳細(xì)介紹了光纖光柵的模式耦合理論,從理論上解釋了光纖光柵模式耦合的原因。對(duì)長(zhǎng)周期光纖光柵的模式耦合理論進(jìn)行了推導(dǎo),利用軟件對(duì)長(zhǎng)周期光纖光柵的輸出光譜進(jìn)行了仿真。然后概括介紹了長(zhǎng)周期光纖光柵的多種制作方法,包括相位掩模法、振幅掩模法、紫外逐點(diǎn)寫(xiě)入法、腐蝕刻槽法、機(jī)械感生寫(xiě)入法等,并對(duì)它們的優(yōu)缺點(diǎn)進(jìn)行了比較分析。另外,還詳細(xì)地介紹了紫外激光制作長(zhǎng)周期光纖光柵的系統(tǒng)搭建,包括光路搭建、光路準(zhǔn)直等。特別要指出的是該系統(tǒng)實(shí)現(xiàn)了光纖光柵制作過(guò)程中準(zhǔn)分子激光器和一維電控平移臺(tái)的一體化控制,開(kāi)發(fā)了集成控制軟件。在軟件中可靈活設(shè)置制作相關(guān)參數(shù),實(shí)現(xiàn)不同種類光纖光柵的制作,大大提高了制作效率。此外,還對(duì)機(jī)械感生寫(xiě)入長(zhǎng)周期光纖光柵的方法進(jìn)行了研究,提出了一種新型的機(jī)械感生壓模模板,可靈活改變光柵長(zhǎng)度、微量改變光柵周期。最后對(duì)機(jī)械感生長(zhǎng)周期光纖光柵進(jìn)行壓力傳感研究,創(chuàng)新地提出感生長(zhǎng)周期光纖光柵和普通長(zhǎng)周期光纖光柵相級(jí)聯(lián)構(gòu)成M-Z干涉儀的結(jié)構(gòu),詳細(xì)分析了它的光譜特性,研究了諧振情況下的壓力傳感,發(fā)現(xiàn)這種由感生長(zhǎng)周期光纖光柵和普通長(zhǎng)周期光纖光柵相級(jí)聯(lián)構(gòu)成的傳感器使傳感靈敏度大大提高。
[Abstract]:Fiber Bragg grating (FBG) is a kind of diffractive grating formed by using certain method to make the refractive index of fiber core change periodically in the axial direction. It has the advantages of small volume, optional wavelength, no influence of nonlinear effect, and strong ability of resisting electromagnetic interference. Low connection loss with optical fiber communication system. In the field of optical fiber communication and optical fiber sensing, it has become a research hotspot in the field of optical fiber. Many industrial automatic control environments, such as water level, petrochemical pipelines, oil wells and gas pipeline pressure, need long-term real-time pressure testing, and the application of long-period fiber Bragg grating in pressure sensing is being deeply studied. In this paper, a kind of phase cascade structure of sensing growth period fiber grating and ordinary long period fiber grating is proposed, in which the inductive long period fiber grating is used as the pressure sensor element. The structure can greatly improve the sensitivity of pressure sensing by using the principle of interference. In this paper, the following research work has been completed and some innovative results have been achieved. Firstly, the classification and spectral characteristics of fiber gratings are introduced, and the applications of fiber gratings in communication and sensing are summarized. Secondly, starting with Maxwell's equations, the mode coupling theory of fiber grating is introduced in detail, and the reason of mode coupling of fiber grating is explained theoretically. The mode coupling theory of long period fiber grating is deduced, and the output spectrum of long period fiber grating is simulated by software. Then several fabrication methods of long period fiber grating are introduced, including phase mask method, amplitude mask method, ultraviolet point-by-point writing method, etching grooving method, mechanically induced writing method, and their advantages and disadvantages are compared and analyzed. In addition, the system construction of long period fiber grating fabricated by UV laser is introduced in detail, including optical path construction, optical path collimation and so on. In particular, it is pointed out that the system realizes the integrated control of excimer laser and one-dimensional electrically controlled translation platform during the fabrication of fiber Bragg gratings, and the integrated control software is developed. In the software, the relevant parameters can be flexibly set to realize the fabrication of different kinds of fiber Bragg gratings, which greatly improves the production efficiency. In addition, the method of mechanically induced writing long period fiber gratings is studied, and a new type of mechanically induced compression mode template is proposed, which can flexibly change the grating length and slightly change the grating period. Finally, the pressure sensing of the mechanically induced growth period fiber grating is studied, and the structure of M-Z interferometer is proposed, which is composed of the phase cascade of the fiber grating and the ordinary long period fiber grating, and the spectral characteristics of M-Z interferometer are analyzed in detail. The pressure sensing under resonant condition is studied. It is found that the sensing sensitivity is greatly improved by this sensor which consists of the cascaded growth period fiber grating (FBG) and the common long-period fiber grating (LPFG).
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN253

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 姜明順;馮德軍;隋青美;;Characteristic research on mechanically induced long-period fiber gratings[J];Chinese Optics Letters;2009年02期

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本文編號(hào)：1875847