本文關(guān)鍵詞： 干涉型光纖傳感器 相位生成載波調(diào)制解調(diào)技術(shù) 振動測量 數(shù)字信號處理　出處：《天津理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：干涉型光纖傳感器相比與其他傳感器有諸多優(yōu)勢,如精確的分辨率、靈敏度較高、較大的動態(tài)響應(yīng)范圍,因而其可以長期在特定環(huán)境下工作。在振動傳感器、溫度傳感器、液位傳感器、折射率傳感器、應(yīng)變傳感器、濕度傳感器等領(lǐng)域中都有廣泛的應(yīng)用。相位生成載波(PGC)調(diào)制解調(diào)技術(shù)具有檢測靈敏度高,動態(tài)范圍大,抗噪聲能力強,避免隨機相位衰落等特點,是一個應(yīng)用前景非常廣闊的零差解調(diào)方法。使用數(shù)字信號處理芯片技術(shù)不僅可以克服模擬器件帶來的隨機直流漂移問題,而且具有很強的靈活性與可擴展性。本文基于PGC調(diào)制解調(diào)技術(shù)與數(shù)字信號處理技術(shù),設(shè)計了兩種級聯(lián)型雙M-Z干涉型振動傳感系統(tǒng),分別可以還原振動波形與測量振動點位置,并且提出了一種搭載在本系統(tǒng)中的PGC改進算法,完成待測信號的解調(diào)。本文的主要工作如下:第一,提出了一種級聯(lián)型雙M-Z干涉型光纖振動傳感器的結(jié)構(gòu),該結(jié)構(gòu)將調(diào)制端與傳感端分別置于每個M-Z干涉儀的其中一個干涉臂,兩個M-Z干涉儀以單模光纖相連。另外,還提出了一種基于基頻混頻的反正切-微分自相乘(Arctan-DSM)算法,該算法可以降低系統(tǒng)的采樣頻率,并且具有抗光強擾動與抗總諧波失真的優(yōu)勢。通過仿真分析驗證以上理論的正確性與有效性。第二,提出了一種級聯(lián)型雙M-Z干涉型光纖振動傳感定位系統(tǒng)的結(jié)構(gòu),該結(jié)構(gòu)將兩個完全相同的M-Z干涉儀用單模光纖相連,在每個M-Z干涉儀上進行相同的調(diào)制,單模光纖作為傳感光纖,感測待測振動信號。并且,對該結(jié)構(gòu)的定位原理進行了詳細的理論研究�；贛ATLAB仿真平臺,對振動點位置進行仿真測量,并且研究了延遲光纖的長度與系統(tǒng)采樣頻率對該系統(tǒng)測量振動點的影響。第三,搭建了級聯(lián)型雙M-Z干涉型光纖振動傳感系統(tǒng),并對干涉光路、預(yù)處理電路以及數(shù)字解調(diào)系統(tǒng)這三個部分進行了相關(guān)實驗。通過已搭建的完整的傳感系統(tǒng),完成了余弦振動信號與啁啾振動信號的正確解調(diào),驗證了該系統(tǒng)適用用于任意信號解調(diào)的結(jié)論。
[Abstract]:The interferometric fiber optic sensor has many advantages over other sensors, such as accurate resolution, high sensitivity, large dynamic response range, so it can work in a specific environment for a long time. Liquid level sensors, refractive index sensors, strain sensors, humidity sensors and other fields have been widely used. Avoiding random phase fading is a widely used homodyne demodulation method. Using digital signal processing chip technology can not only overcome the random DC drift caused by analog devices. Based on the PGC modulation and demodulation technology and digital signal processing technology, two cascaded double M-Z interferometric vibration sensing systems are designed, which can restore the vibration waveform and measure the position of the vibration point, respectively. An improved PGC algorithm is proposed to demodulate the signal to be tested. The main work of this paper is as follows: first, the structure of a cascaded double M-Z interferometric fiber optic vibration sensor is proposed. The two M-Z interferometers are connected by a single mode optical fiber. In addition, an algorithm based on the fundamental frequency mixing is proposed to solve the problem of Arctan-DSM, which is based on the fundamental frequency mixing of the two M-Z interferometers, in which the modulation terminal and the sensing terminal are placed in one of the interference arms of each M-Z interferometer respectively, and the two M-Z interferometers are connected with each other by a single mode optical fiber. The algorithm can reduce the sampling frequency of the system and has the advantages of resisting the intensity disturbance and the total harmonic distortion. The simulation results show that the above theory is correct and effective. In this paper, a structure of cascaded double M-Z interferometric optical fiber vibration sensing and positioning system is proposed. Two identical M-Z interferometers are connected with each M-Z interferometer by a single mode optical fiber, and each M-Z interferometer is modulated in the same way, and the single-mode fiber is used as the sensing fiber. The vibration signal is detected and the positioning principle of the structure is studied in detail. Based on the MATLAB simulation platform, the vibration point position is measured by simulation. The effects of the length of the delayed fiber and the sampling frequency of the system on the measurement vibration point of the system are studied. Thirdly, a cascade double M-Z interferometric optical fiber vibration sensing system is built, and the interference optical path is analyzed. Three parts of preprocessing circuit and digital demodulation system are experimented. The correct demodulation of cosine vibration signal and chirped vibration signal is accomplished through the complete sensing system. The conclusion that the system is suitable for any signal demodulation is verified.
【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TP212;TN763

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