本文選題：布里淵散射 + 瑞利散射　； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：本文介紹了分布式光纖傳感技術(shù)的發(fā)展背景和現(xiàn)狀,主要闡述了布里淵光時域分析(BOTDA)的研究現(xiàn)狀,論述了光纖中的布里淵散射特性,揭示了其與溫度和應(yīng)變的關(guān)系。分析了基于編碼的瑞利BOTDA的傳感理論及性能,并對編碼瑞利BOTDA實驗系統(tǒng)進(jìn)行了研究與設(shè)計。首先針對編碼瑞利BOTDA系統(tǒng)中的編碼技術(shù)即格雷碼和Simplex(簡稱S)碼技術(shù)進(jìn)行了簡單介紹,分析其編解碼原理;深入研究格雷碼和S碼在瑞利BOTDA系統(tǒng)中的實現(xiàn)方法,并對編碼瑞利BOTDA系統(tǒng)的信噪比改善量進(jìn)行了理論分析和仿真驗證。其次分析了基于雪崩光電二極管(APD)檢測和S編碼的瑞利BOTDA系統(tǒng)中的兩種噪聲,隨機(jī)散粒噪聲和熱噪聲。隨機(jī)散粒噪聲功率和信號功率有關(guān),而熱噪聲功率主要取決于APD光電檢測器的性能、與信號功率無關(guān)。由系統(tǒng)中與兩種噪聲相關(guān)的電流波動的方差和S碼的編解碼規(guī)則可得編碼系統(tǒng)的均方誤差,由此推導(dǎo)了系統(tǒng)信噪比和編碼增益公式,并利用MATLAB進(jìn)行了仿真驗證。最后設(shè)計了格雷碼瑞利BOTDA實驗系統(tǒng),重點(diǎn)設(shè)計的部分是系統(tǒng)的編解碼部分。在設(shè)計編碼系統(tǒng)前先進(jìn)行了單脈沖編碼瑞利BOTDA系統(tǒng)的設(shè)計和測量。理論分析了受激布里淵散射(SBS)瞬態(tài)耦合波方程對非歸零(NRZ)碼和歸零(RZ)碼系統(tǒng)中聲波場幅度和布里淵增益的影響,進(jìn)行了NRZ和RZ的格雷碼瑞利BOTDA系統(tǒng)的實驗研究。
[Abstract]:In this paper, the development background and present situation of distributed optical fiber sensing technology are introduced, the research status of Brillouin optical time domain analysis (BOTDA) is mainly described, the Brillouin scattering characteristics in optical fiber are discussed, and the relationship between Brillouin scattering and temperature and strain is revealed. The sensing theory and performance of coded Rayleigh BOTDA are analyzed, and the experimental system of coded Rayleigh BOTDA is studied and designed. Firstly, this paper introduces the coding technology of Rayleigh BOTDA system, that is, Graycode and Simplexcode, analyzes the encoding and decoding principle, and deeply studies the realization method of Gray-code and S-Code in Rayleigh BOTDA system. The improvement of signal-to-noise ratio of coded Rayleigh BOTDA system is analyzed theoretically and verified by simulation. Secondly, two kinds of noise, random shot noise and thermal noise, in Rayleigh BOTDA system based on avalanche photodiode detection and S-coding are analyzed. The random shot noise power is related to the signal power, while the thermal noise power mainly depends on the performance of the APD photodetector and is independent of the signal power. The mean square error of the coding system can be obtained from the variance of the current fluctuation associated with two kinds of noise and the encoding and decoding rules of the S-code. The formulas of the SNR and the coding gain of the system are derived and verified by MATLAB simulation. Finally, a Gray-Rayleigh BOTDA experimental system is designed, the key part of which is the coding and decoding part of the system. The design and measurement of monopulse coded Rayleigh BOTDA system are carried out before the design of coding system. The effects of transient coupled wave equations of stimulated Brillouin scattering (SBS) on the amplitude of acoustic field and Brillouin gain in non-return-to-zero (NRZ) and return-to-zero (RZ) codes are analyzed theoretically. The experimental study of Gray-Code-Rayleigh BOTDA system of NRZ and RZ is carried out.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP212

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本文編號：1861080