全光纤可调谐激光器自混合绝对距离测量研究

发布时间：2018-10-10 14:17

【摘要】：自混合测距技术凭借结构紧凑、光路简单、无需外部光分束器件等诸多优势,近年受到研究者广泛关注。现有传统半导体激光自混合测距技术受制于激光器输出波长线性调谐范围及功率波动影响,极大制约了测量分辨率、精度,并限制其使用场合。本学位论文提出一种结合光纤技术的全光纤结构激光自混合测距系统,具有光路安排灵活、空间分辨率高、防电磁干扰、并可与通讯网络互联互通等优势,可避免传统激光自混合测距方案的上述缺陷。理论研究上,我们结合三镜腔理论、光放大方程和边界条件方程,建立了光纤激光器自混合测距系统的理论模型。深入研究了全光纤线性腔激光器和环形腔激光器自混合测距技术的原理,推导出激光器外腔距离与自混合信号波动频率之间的对应关系;实验研究上,设计并搭建了两种调谐机制、两种腔体结构的全光纤型激光自混合测距系统,重点研究分析两种腔体结构下全光纤型激光自混合测距传感系统特性。同时通过对系统环境、检测电路噪声、光纤特征参数、出射光束参数、光反馈强度的深度优化,进一步提高了激光自混合绝对距离传感系统整体性能。本文的创新点主要包括:1.建立基于可调谐线性腔光纤激光器及可调谐环形腔光纤激光器的激光自混合绝对距离传感理论模型,针对两种腔体结构的激光自混合传感理论模型进行深入讨论和分析;2.基于光纤光栅波长调谐机理,搭建一套全光纤线性腔激光器自混合测距系统,实现了对外腔绝对距离的测量,并对实验结果进行了分析。3.结合可调谐FFP滤波器,搭建全光纤环形腔激光器自混合测距系统,进行目标物距离测量实验。并对全光纤环形腔激光器自混合测距系统测距精度和测距范围进行了研究分析。
[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.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

【参考文献】