本文選題：線性調(diào)頻連續(xù)波 + DFB��； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：線性調(diào)頻連續(xù)波(LFMCW,Linear Frequency Modulated Continuous Wave)激光器雷達(dá)測距技術(shù)是一種非接觸式、高精度、高效率、無盲區(qū)的大尺寸絕對距離測量技術(shù)。其測距原理要求必須有一個(gè)高調(diào)頻線性度的可調(diào)諧激光器,而實(shí)際中的可調(diào)諧激光器都存在固有的調(diào)頻非線性,差拍信號的頻譜會因此出現(xiàn)展寬,測距的分辨率和精度會受到嚴(yán)重影響。本文主要圍繞DFB激光器的線性調(diào)頻技術(shù)研究,簡要說明了DFB激光器注入電流調(diào)頻原理及調(diào)頻非線性產(chǎn)生的原因。對調(diào)頻非線性的影響進(jìn)行了理論分析和仿真。測試了激光器的靜態(tài)調(diào)頻參數(shù),設(shè)計(jì)并搭建了DFB激光器的動(dòng)態(tài)調(diào)頻特性測試系統(tǒng)對DFB激光器的動(dòng)態(tài)調(diào)頻特性進(jìn)行了測試,實(shí)現(xiàn)結(jié)果表明DFB激光器調(diào)頻帶寬隨調(diào)制頻率的增加而減小,并分析了這種現(xiàn)象產(chǎn)生的原因。從理論上推導(dǎo)了基于軟件的非線性校正迭代算法模型,并搭建了非線性軟件校正系統(tǒng)進(jìn)行了實(shí)驗(yàn),很大程度上降低了DFB激光器的調(diào)頻非線性,而且這種方法也適用于其他類型的電流注入式調(diào)諧激光器。另外這種校正方法也可以實(shí)現(xiàn)對激光器調(diào)頻速率的改變。對基于光電鎖相環(huán)的DFB激光器線性調(diào)頻系統(tǒng)進(jìn)行了分析、仿真、電路設(shè)計(jì)以及等效模型的測試。使用DFB激光器作為調(diào)頻源進(jìn)行調(diào)頻連續(xù)波干涉測距,對激光器未經(jīng)校正和經(jīng)過校正后的測距重復(fù)性精度進(jìn)行了對比分析,實(shí)驗(yàn)結(jié)果表明經(jīng)過校正后的測距精度提高了29.26倍。但是由于激光器功率的波動(dòng)、掃頻的拐點(diǎn)效應(yīng)、系統(tǒng)中的噪聲的影響,以及設(shè)計(jì)的非線性開環(huán)校正方法本身存在的問題,經(jīng)過非線性校正后激光器仍殘余不小的非線性。
[Abstract]:LFM CW LFMCW linear Frequency Modulated Continuous Wave) laser radar ranging technology is a non-contact, high precision, high efficiency, no blind area large size absolute distance measurement technology. The principle of ranging requires that there must be a tunable laser with high frequency modulation linearity. In practice, the tunable laser has inherent frequency nonlinearity, and the spectrum of the beat signal will be widened. The resolution and accuracy of ranging will be seriously affected. This paper mainly focuses on the study of linear frequency modulation (LFM) technology of DFB laser, and briefly explains the principle of injection current frequency modulation of DFB laser and the cause of frequency modulation nonlinearity. The influence of frequency modulation nonlinearity is theoretically analyzed and simulated. The static frequency modulation parameters of the laser are tested, and the dynamic frequency modulation characteristic of DFB laser is designed and built. The dynamic frequency modulation characteristic of DFB laser is tested. The results show that the frequency modulation bandwidth of DFB laser decreases with the increase of modulation frequency, and the causes of this phenomenon are analyzed. In this paper, the iterative algorithm model of nonlinear correction based on software is derived theoretically, and the nonlinear software correction system is built for experiment, which greatly reduces the frequency modulation nonlinearity of DFB laser. This method is also suitable for other types of current-injection tunable lasers. In addition, the frequency modulation rate of the laser can be changed by this correction method. The linear frequency modulation (LFM) system of DFB laser based on optoelectronic PLL is analyzed, simulated, circuit design and equivalent model test are presented. DFB laser is used as frequency modulation source for frequency modulation CW interferometric ranging. The repeatability accuracy of uncorrected and corrected ranging is compared and analyzed. The experimental results show that the corrected ranging accuracy is 29.26 times higher. However, due to the fluctuation of laser power, the inflexion effect of frequency sweep, the influence of noise in the system, and the problems of the designed nonlinear open-loop correction method, the laser still remains a large amount of nonlinearity after nonlinear correction.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248.4

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本文編號：1876858