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  本文選題：光纖矢量水聽器 + 壓差式�。� 參考：《蘭州交通大學》2017年碩士論文

【摘要】：壓差式矢量水聽器的校準一直是一個較難解決的問題,針對此問題本文設(shè)計了一中基于光纖傳感的壓差式矢量水聽器對其傳感原理進行了理論分析,并為其設(shè)計了駐波場校準方案,對駐波場校準此類壓差式矢量水聽器進行了理論分析和計算機仿真并作比較。此類研究方法對壓差式矢量水聽器的應(yīng)用具有重要的作用和意義。世界各國對海洋資源開發(fā)和海洋探測的需要對光纖水聽器和水聲矢量探測器的研發(fā)和應(yīng)用提供了有力的推動作用。在構(gòu)成原理上本文所設(shè)計的壓差式光纖矢量水聽器是以Michelson光纖干涉儀為信號傳感基礎(chǔ),以順變柱體和聲壓感應(yīng)膜片為矢量水聽器的載體,以電信號的分析來解調(diào)聲場中的聲壓差以及聲場的矢量信息。在傳感原理方面,壓差式光纖矢量水聽器通過順變柱體兩端的聲壓感應(yīng)膜片來接受聲場中的聲壓梯度信息或質(zhì)點振速信息,然后將聲場中的壓力信息通過順變柱體傳導(dǎo)到順變柱體并引起順變柱體的物理性變,進而由纏繞在順變柱體兩端Michelson光纖干涉儀的量光信號傳感臂探測到形變信息并將此形變信號轉(zhuǎn)化為光纖干涉儀中的光干涉信號。文章在對順變柱體在靜態(tài)條件下應(yīng)力應(yīng)變分析的基礎(chǔ)上分析了順變柱體在外界聲壓作用下的形變方程,并在此基礎(chǔ)上分析了壓差式光纖矢量水聽器順變柱體膜片復(fù)合結(jié)構(gòu)同纏繞光纖之間在外加聲壓作用下的耦合形變。同時在此基礎(chǔ)上推到了矢量水聽器的聲壓-相移靈敏度輸出原理,并得到了精確的相移輸出公式。隨后分析了各設(shè)計參數(shù)對影響矢量水聽器聲壓-相移靈敏度的影響,并對其一一作了計算機仿真分析,又在此基礎(chǔ)上分析了矢量水聽器在動態(tài)測量條件下的諧振對其矢量測量的影響。最后在前面分析和總結(jié)的基礎(chǔ)上對其動態(tài)條件下的聲壓-相移靈敏度作了仿真分析,并對影響矢量水聽器相移輸出的各要素作了詳細的討論和分析,同時在矢量水聽器聲壓-相移靈敏度頻率響應(yīng)分析的基礎(chǔ)上分析了在不同條件下矢量水聽器的指向性曲線。
[Abstract]:The calibration of pressure differential vector hydrophone is always a difficult problem to solve. In this paper, a pressure differential vector hydrophone based on fiber optic sensor is designed and its sensing principle is analyzed theoretically. The standing wave field calibration scheme is designed, and the theoretical analysis and computer simulation of the pressure differential vector hydrophone calibration for the standing wave field are carried out and compared. This kind of research method has important function and significance to the application of pressure differential vector hydrophone. The development of ocean resources and the need of ocean exploration in the world provide a powerful impetus to the development and application of fiber optic hydrophone and acoustic vector detector. In the principle of constitution, the pressure differential fiber vector hydrophone designed in this paper is based on the Michelson fiber interferometer as the signal sensor, and takes the variable cylinder and the sound pressure induction diaphragm as the vector hydrophone carrier. The signal analysis is used to demodulate the acoustic pressure difference and the vector information of the sound field. In the aspect of sensing principle, the pressure differential fiber vector hydrophone receives the information of sound pressure gradient or particle velocity through the sound pressure inductive diaphragm at the two ends of the variable cylinder. Then the pressure information in the sound field is transmitted through the paramorph cylinder to the paramorph cylinder, which causes the physical change of the paramorph cylinder. Furthermore, the deformation information is detected by the optical signal sensing arm which is wound at the two ends of the Michelson fiber interferometer and converted into the optical interference signal in the optical fiber interferometer. Based on the analysis of stress and strain of paramorph cylinder under static condition, the deformation equation of paramorph cylinder under external sound pressure is analyzed in this paper. On the basis of this, the coupling deformation between the compound structure of the pressure-differential fiber vector hydrophone and the winding fiber under the action of the external sound pressure is analyzed. At the same time, the output principle of the acoustic pressure-phase shift sensitivity of the vector hydrophone is deduced, and the accurate phase shift output formula is obtained. Then, the influence of design parameters on the sensitivity of acoustic pressure-phase shift of the influence vector hydrophone is analyzed, and the computer simulation analysis is done to each of them. On this basis, the effect of the resonance of the vector hydrophone on the vector measurement is analyzed. Finally, on the basis of the previous analysis and summary, the acoustic pressure-phase shift sensitivity under the dynamic condition is simulated, and the factors that affect the phase shift output of the vector hydrophone are discussed and analyzed in detail. At the same time, the directivity curve of vector hydrophone under different conditions is analyzed on the basis of the frequency response analysis of the acoustic pressure-phase shift sensitivity of vector hydrophone.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB565.1

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