【摘要】：近年來,基于法布里珀羅標(biāo)準(zhǔn)具(FPE)結(jié)合增強(qiáng)型電耦合元件(ICCD)的布里淵激光雷達(dá)系統(tǒng)被廣泛用來遙感海洋特性,如海水溫度、聲速、鹽度等。在該系統(tǒng)中,采用ICCD記錄布里淵散射信號經(jīng)過FPE后形成的干涉圓環(huán)圖樣,然后從干涉圓環(huán)圖樣中提取布里淵譜特征參數(shù)如布里淵頻移和半高線寬等信息,進(jìn)而根據(jù)譜特征參數(shù)與海水介質(zhì)特性的關(guān)系反演得到海水特性。該方法為非掃描式測量,測量耗時(shí)短,對入射光的準(zhǔn)執(zhí)行、立體角以及激光器的單穩(wěn)頻特性沒有嚴(yán)格要求,能適應(yīng)實(shí)際海洋遙感測量應(yīng)用中復(fù)雜惡劣的環(huán)境。然而,一方面受到目前ICCD像素尺寸限制,ICCD記錄的干涉譜分辨率有限;另一方面經(jīng)過FPE后得到的干涉譜與入射布里淵散射頻譜的相關(guān)理論不完備,沒有對兩者進(jìn)行區(qū)分。這兩個(gè)因素共同限制了該技術(shù)的測量精度,傳統(tǒng)處理方法的散射頻譜測量精度只有約幾十MHz,對應(yīng)約1oC的溫度精度,無法滿足高精度測量應(yīng)用的需求。為了提高該系統(tǒng)的布里淵散射譜特征參數(shù)的測量精度,本文首先研究了海水布里淵散射的基礎(chǔ)理論知識以及布里淵散射測量海水溫度原理,為后續(xù)工作奠定理論基礎(chǔ);然后研究了FPE的工作原理以及布里淵散射光經(jīng)過FPE后的干涉圓環(huán)圖樣形成原理,從理論上對干涉譜和入射布里淵散射頻譜進(jìn)行了區(qū)分;在認(rèn)知到了兩者區(qū)別之后,本文在總結(jié)針對干涉譜的傳統(tǒng)處理方法的基礎(chǔ)上,對干涉圓環(huán)圖樣進(jìn)行預(yù)處理提高了干涉譜分辨率,并提出了新的干涉譜擬合反演模型,采用列文伯格-馬夸特(L-M)算法進(jìn)行最小二乘誤差擬合反演,精確獲取布里淵散射頻譜,提高譜特征參數(shù)測量精度;針對L-M算法中參數(shù)設(shè)置問題,進(jìn)行了預(yù)分析和優(yōu)化設(shè)置。最后通過實(shí)驗(yàn)驗(yàn)證,證實(shí)該方法可以實(shí)現(xiàn)高精度譜特征參數(shù)的測量,測量精度達(dá)到MHz量級,對應(yīng)海水溫度測量精度提高到0.1oC,測量精度得到了顯著提高。
[Abstract]:In recent years Brillouin lidar systems based on Fabry-Perot standard with (FPE) and enhanced electrically coupled element (ICCD) have been widely used for remote sensing of ocean characteristics such as sea water temperature sound velocity salinity and so on. In this system, the interference ring pattern formed by Brillouin scattering signal through FPE is recorded by ICCD, and the Brillouin spectrum characteristic parameters such as Brillouin frequency shift and half-high linewidth are extracted from the interference ring pattern. Then the characteristics of seawater are obtained by inversion of the relationship between spectral characteristic parameters and the characteristics of seawater media. This method is a non-scanning measurement, which takes a short time to measure, has no strict requirements for the quasi-execution of incident light, the stereo angle and the single frequency stability of the laser, and can adapt to the complex and harsh environment in the practical marine remote sensing application. However, on the one hand, the resolution of interference spectrum is limited by ICCD pixel size, on the other hand, the theory of interference spectrum and incident Brillouin scattering spectrum obtained by FPE is not complete, and they are not distinguished from each other. These two factors limit the measurement accuracy of this technique. The traditional method of scattering spectrum measurement has only about dozens of MHz, corresponding to the temperature accuracy of about 1oC, which can not meet the needs of high precision measurement. In order to improve the measurement accuracy of Brillouin scattering characteristic parameters, the basic theory of Brillouin scattering and the principle of Brillouin scattering measuring seawater temperature are studied in this paper. Then, the working principle of FPE and the formation principle of the interference ring pattern of Brillouin scattering light passing through FPE are studied, and the interference spectrum and the incident Brillouin scattering spectrum are distinguished theoretically. On the basis of summarizing the traditional processing methods of interference spectrum, this paper improves the resolution of interference spectrum by preprocessing the interference ring pattern, and puts forward a new inversion model of interference spectrum fitting. Levenberg-Marquardt (L-M) algorithm is used for least square error fitting inversion to obtain Brillouin scattering spectrum accurately and to improve the measurement accuracy of spectral characteristic parameters. The parameter setting problem in L-M algorithm is pre-analyzed and optimized. Finally, the experimental results show that this method can achieve high precision spectral characteristic parameter measurement. The measurement accuracy reaches MHz level, and the corresponding seawater temperature measurement precision is improved to 0.1oC, and the measurement precision is improved significantly.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P715

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