本文選題：布里淵光時(shí)域分析儀　切入點(diǎn)：光纜溫度傳遞　出處：《電子科技大學(xué)》2014年碩士論文

【摘要】：光纖傳感技術(shù)由于其無可比擬的優(yōu)勢(shì),在現(xiàn)代測(cè)量技術(shù)中受到人們?cè)絹碓蕉嗟闹匾?尤其是分布式光纖傳感技術(shù),其可以實(shí)現(xiàn)對(duì)被測(cè)量長距離、實(shí)時(shí)性地監(jiān)測(cè),受到國內(nèi)外研究學(xué)者的重點(diǎn)關(guān)注,已經(jīng)被廣泛應(yīng)用在電力工程、軍事防御、周界安防等領(lǐng)域。目前對(duì)于提高測(cè)量精度在系統(tǒng)方面已經(jīng)進(jìn)行過眾多研究,然而在實(shí)際的測(cè)量過程中,光纜對(duì)系統(tǒng)的測(cè)量精度也產(chǎn)生一定的影響,進(jìn)而影響系統(tǒng)總體性能,本論文對(duì)布里淵光時(shí)域分析儀(BOTDA)中光纜的特性進(jìn)行了理論及實(shí)驗(yàn)研究,研究?jī)?nèi)容主要分為兩個(gè)方面:一是溫度傳感光纜的溫度傳遞時(shí)間及其對(duì)系統(tǒng)響應(yīng)時(shí)間的影響;二是應(yīng)變傳遞光纜在不同的材料及布設(shè)方式下的應(yīng)變傳遞性能。具體研究?jī)?nèi)容如下:首先介紹了傳熱學(xué)的基本相關(guān)理論,在此基礎(chǔ)之上分析了溫度傳感光纜的溫度傳遞機(jī)制,并在有限元軟件中建立模型進(jìn)行仿真,接著設(shè)計(jì)溫度傳遞實(shí)驗(yàn)進(jìn)行驗(yàn)證,仿真與實(shí)驗(yàn)結(jié)果相吻合,為分析光纜溫度傳遞時(shí)間提供了一種方法,并結(jié)合BOTDA系統(tǒng)進(jìn)行光纜與緊包光纖的溫度傳遞對(duì)比實(shí)驗(yàn),結(jié)果表明光纜在一定條件下會(huì)影響系統(tǒng)的響應(yīng)時(shí)間;然后分析了應(yīng)變傳感光纜在不同的布設(shè)方式下的應(yīng)變傳遞特性:首先分析了埋入式光纜的應(yīng)變傳遞原理,建立埋入式應(yīng)變傳遞光纜模型,并在有限元軟件中對(duì)影響其應(yīng)變傳遞性能的因素進(jìn)行仿真分析,結(jié)果表明涂敷層的彈性模量越大、厚度越小,光纜的應(yīng)變傳遞效果越好,相比之下,護(hù)套層材料對(duì)應(yīng)變傳遞性能的影響較小,可忽略;接著在表面粘貼式光纖光柵(FBG)的應(yīng)變傳遞理論基礎(chǔ)之上,推導(dǎo)了應(yīng)變傳遞光纜在表面粘貼布設(shè)方式下的應(yīng)變傳遞機(jī)制,得到應(yīng)變傳遞系數(shù)表達(dá)式,并在有限元軟件中對(duì)定點(diǎn)布設(shè)和全面粘貼兩種方式進(jìn)行仿真,分別得到其所對(duì)應(yīng)的應(yīng)變傳遞系數(shù)曲線。本論文的研究結(jié)果為工程應(yīng)用中不同場(chǎng)合光纜的選擇提供了一定的方法和指導(dǎo),有望促進(jìn)分布式光纖傳感系統(tǒng)性能的進(jìn)一步優(yōu)化。
[Abstract]:Because of its unparalleled advantages, optical fiber sensing technology has been paid more and more attention in modern measurement technology, especially distributed optical fiber sensing technology, which can realize the real-time monitoring of long distance measurement. It has been widely used in the fields of power engineering, military defense, perimeter security and so on. At present, many researches have been carried out to improve the measurement accuracy in the field of system. However, in the actual measurement process, the optical fiber cable also has a certain influence on the measurement accuracy of the system, and then affects the overall performance of the system. In this paper, the characteristics of optical fiber cable in Brillouin Optical time Domain Analyzer (BOTDA) are studied theoretically and experimentally. The research contents are divided into two aspects: first, the temperature transfer time of the temperature sensing cable and its effect on the response time of the system; Second, the strain transfer performance of the strain-transfer optical cable under different materials and layout. The specific research contents are as follows: firstly, the basic related theory of heat transfer is introduced, and then the temperature transfer mechanism of the temperature sensing cable is analyzed. The model is established in the finite element software for simulation, and then the temperature transfer experiment is designed to verify it. The simulation results are in agreement with the experimental results, which provides a method for analyzing the temperature transfer time of optical fiber cable. The experimental results of temperature transfer between fiber optic fiber and fiber optic fiber show that the response time of the system will be affected by the cable under certain conditions. Then the strain transfer characteristics of the strain sensing cable under different arrangement modes are analyzed. Firstly, the strain transfer principle of the embedded fiber optic cable is analyzed, and the embedded strain transmission cable model is established. The results show that the greater the elastic modulus and the smaller the thickness of the coating, the better the strain transfer effect of the fiber optic cable, and the simulation results of the factors affecting the strain transfer performance in the finite element software show that the higher the elastic modulus and the smaller the thickness of the coating layer, the better the strain transfer effect of the cable. The effect of sheathing material on the strain transfer performance is negligible, and the strain transfer mechanism of the strain-transfer cable is deduced on the basis of the strain transfer theory of the surface bonded fiber Bragg grating (FBG). The expression of strain transfer coefficient is obtained, and the two methods of fixed point placement and full pasting are simulated in finite element software. The corresponding strain transfer coefficient curves are obtained respectively. The research results in this paper provide a certain method and guidance for the selection of optical fiber cables in different applications in engineering applications, which is expected to promote the further optimization of the performance of distributed optical fiber sensing systems.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN818
，

本文編號(hào)：1661952