本文選題：光纖光柵解調(diào) + 非均勻采樣　； 參考：《中北大學(xué)》2014年碩士論文

【摘要】：光纖布拉格光柵傳感器憑借著光纖特有的高絕緣性、耐腐蝕性、強抗電磁干擾性以及穩(wěn)定的化學(xué)特性,能夠在高溫、高濕、高壓、強噪聲、強腐蝕性等復(fù)雜條件中穩(wěn)定工作,并能夠結(jié)合光纖遙感、遙測技術(shù),形成光纖遙感系統(tǒng)和光纖遙測系統(tǒng),而在傳感領(lǐng)域內(nèi)相對于傳統(tǒng)的電傳感器有著絕對的優(yōu)勢。光通信科技的蓬勃發(fā)展和光柵寫入技術(shù)的不斷進步使光纖光柵傳感器也迎來了巨大的發(fā)展契機。 本文主要介紹了一種基于非均勻采樣的光纖光柵解調(diào)系統(tǒng),提出了利用掃描周期隨機變化的正弦波來實現(xiàn)傳感光纖光柵的非等間隔采樣,極大地拓寬了光纖傳感裝置的測量帶寬,同時也滿足了傳感器對于測量高精度的追求,完善了基于可調(diào)諧F-P濾波器重疊多光柵傳感裝置由多光柵的引入導(dǎo)致的數(shù)據(jù)混疊問題,提高傳感光纖光柵的應(yīng)用范圍和靈活性,滿足了光纖傳感解調(diào)裝置對于測量精度和寬度的同時需求。 本文在對光纖光柵解調(diào)原理進行深入了解的基礎(chǔ)上,對現(xiàn)有的光纖光柵解調(diào)技術(shù)進行了研究和對比,確定基于可調(diào)諧F-P濾波器的光纖光柵解調(diào)方案,并詳細分析影響基于可調(diào)諧F-P濾波器的光纖光柵解調(diào)系統(tǒng)性能指標(biāo)的因素；掌握光柵解調(diào)系統(tǒng)各部分元器件的工作原理和性能參數(shù),分析光纖光柵傳感系統(tǒng)的傳感原理和解調(diào)方式,設(shè)計硬件電路,搭建基于非均勻采樣的光纖光柵解調(diào)系統(tǒng)測試平臺；重點研究了非均勻采樣的實現(xiàn)方法,介紹非均勻采樣算法的解算原理,分別從模擬實驗角度和系統(tǒng)實際方向?qū)Ψ蔷鶆虿蓸铀惴ǖ目够殳B特性做了驗證,結(jié)果證實非均勻采樣算法能夠以低于尼奎斯特采樣頻率的采樣率對待測信號進行采樣分析,能夠在頻域上完整地還原原始信號而不產(chǎn)生失真和混疊現(xiàn)象,以及將非均勻采樣和重疊雙光柵傳感解調(diào)系統(tǒng)相融合,提高系統(tǒng)各項性能指標(biāo)。
[Abstract]:Fiber Prague grating sensor is able to work steadily in complex conditions such as high temperature, high humidity, high pressure, strong noise and strong corrosion by virtue of its unique high insulation, corrosion resistance, strong resistance to electromagnetic interference and stable chemical properties, and can combine fiber remote sensing and telemetry to form optical fiber remote sensing system and optical fiber telemetry system. In the field of sensing, it has an absolute advantage over the traditional electric sensors. The rapid development of optical communication technology and the continuous progress of grating writing technology make the fiber grating sensor have a great opportunity to develop.
In this paper, a fiber Bragg grating demodulation system based on non uniform sampling is introduced. The non equal interval sampling of sensing fiber Bragg grating is realized by the sine wave of random change of scanning period, which greatly widens the measurement bandwidth of the optical fiber sensing device, and also satisfies the pursuit of high precision of the sensor and perfect the base. The data aliasing caused by the introduction of multiple gratings is caused by the multi grating sensing device of tunable F-P filter, which improves the application range and flexibility of the sensing fiber Bragg grating, and satisfies the demand for the measurement accuracy and width of the optical fiber sensing demodulation device.
Based on the thorough understanding of the principle of fiber Bragg grating demodulation, this paper studies and compares the existing fiber grating demodulation technology, determines the fiber grating demodulation scheme based on the tunable F-P filter, and analyzes the factors affecting the performance index of the optical fiber grating demodulation system based on the tunable F-P filter, and master the light. The work principle and performance parameters of all parts of the grating demodulation system, analyze the sensing principle and demodulation mode of the fiber Bragg grating sensing system, design the hardware circuit, build the testing platform of the fiber Bragg grating demodulation system based on non uniform sampling, focus on the non uniform sampling method, and introduce the solution of the non-uniform sampling algorithm. We verify the anti aliasing characteristics of the non uniform sampling algorithm from the simulation experiment angle and the system actual direction. The result proves that the non-uniform sampling algorithm can treat the measured signal with the sampling rate below the nquist sampling frequency, and can completely restore the original signal in the frequency domain without producing distortion and aliasing. Phenomenon, and the integration of non-uniform sampling and overlapped double grating sensing demodulation system to improve the performance indicators of the system.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TP212

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