【摘要】：自混合測距技術(shù)憑借結(jié)構(gòu)緊湊、光路簡單、無需外部光分束器件等諸多優(yōu)勢,近年受到研究者廣泛關(guān)注。現(xiàn)有傳統(tǒng)半導(dǎo)體激光自混合測距技術(shù)受制于激光器輸出波長線性調(diào)諧范圍及功率波動影響,極大制約了測量分辨率、精度,并限制其使用場合。本學(xué)位論文提出一種結(jié)合光纖技術(shù)的全光纖結(jié)構(gòu)激光自混合測距系統(tǒng),具有光路安排靈活、空間分辨率高、防電磁干擾、并可與通訊網(wǎng)絡(luò)互聯(lián)互通等優(yōu)勢,可避免傳統(tǒng)激光自混合測距方案的上述缺陷。理論研究上,我們結(jié)合三鏡腔理論、光放大方程和邊界條件方程,建立了光纖激光器自混合測距系統(tǒng)的理論模型。深入研究了全光纖線性腔激光器和環(huán)形腔激光器自混合測距技術(shù)的原理,推導(dǎo)出激光器外腔距離與自混合信號波動頻率之間的對應(yīng)關(guān)系;實(shí)驗研究上,設(shè)計并搭建了兩種調(diào)諧機(jī)制、兩種腔體結(jié)構(gòu)的全光纖型激光自混合測距系統(tǒng),重點(diǎn)研究分析兩種腔體結(jié)構(gòu)下全光纖型激光自混合測距傳感系統(tǒng)特性。同時通過對系統(tǒng)環(huán)境、檢測電路噪聲、光纖特征參數(shù)、出射光束參數(shù)、光反饋強(qiáng)度的深度優(yōu)化,進(jìn)一步提高了激光自混合絕對距離傳感系統(tǒng)整體性能。本文的創(chuàng)新點(diǎn)主要包括:1.建立基于可調(diào)諧線性腔光纖激光器及可調(diào)諧環(huán)形腔光纖激光器的激光自混合絕對距離傳感理論模型,針對兩種腔體結(jié)構(gòu)的激光自混合傳感理論模型進(jìn)行深入討論和分析;2.基于光纖光柵波長調(diào)諧機(jī)理,搭建一套全光纖線性腔激光器自混合測距系統(tǒng),實(shí)現(xiàn)了對外腔絕對距離的測量,并對實(shí)驗結(jié)果進(jìn)行了分析。3.結(jié)合可調(diào)諧FFP濾波器,搭建全光纖環(huán)形腔激光器自混合測距系統(tǒng),進(jìn)行目標(biāo)物距離測量實(shí)驗。并對全光纖環(huán)形腔激光器自混合測距系統(tǒng)測距精度和測距范圍進(jìn)行了研究分析。
[Abstract]:Due to the advantages of compact structure, simple optical path and no external beam splitter, self-mixing ranging technology has attracted much attention in recent years. The traditional semiconductor laser self-mixing ranging technology is limited by the linear tuning range of laser output wavelength and the influence of power fluctuation, which greatly restricts the measurement resolution, accuracy and application. In this dissertation, an all-fiber structure laser self-mixing ranging system with optical fiber technology is proposed, which has the advantages of flexible optical path arrangement, high spatial resolution, anti-electromagnetic interference, and interworking with communication network. The above defects of the conventional laser self-mixing ranging scheme can be avoided. In the theoretical research, the theoretical model of the fiber laser self-mixing ranging system is established by combining the three-mirror cavity theory, the optical amplification equation and the boundary condition equation. In this paper, the principle of all-fiber linear cavity laser and ring cavity laser self-mixing ranging technology is deeply studied, and the corresponding relationship between the external cavity distance and the wave frequency of the self-mixing signal is deduced. In this paper, two tuning mechanisms and two cavity structures are designed and built for all-fiber laser self-mixing ranging system. The characteristics of all-fiber laser self-mixing ranging sensing system with two cavity structures are studied and analyzed. At the same time, the overall performance of laser self-mixing absolute distance sensing system is further improved by optimizing the system environment, detecting circuit noise, fiber characteristic parameters, outgoing beam parameters and optical feedback intensity. The innovation of this paper mainly includes: 1. The theoretical model of laser self-mixing absolute distance sensing based on tunable linear cavity fiber laser and tunable ring cavity fiber laser is established. The theoretical model of laser self-mixing sensing based on two cavity structures is discussed and analyzed in depth. 2. Based on the wavelength tuning mechanism of fiber Bragg grating, an all-fiber linear cavity laser self-mixing ranging system is set up to measure the absolute distance of external cavity. The experimental results are analyzed. Combined with tunable FFP filter, an all-fiber ring cavity laser self-mixing ranging system is built, and the target distance measurement experiment is carried out. The ranging accuracy and range of all fiber ring laser self-mixing ranging system are studied and analyzed.
【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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本文編號：2262104