基于二次反馈激光自混合测距方法的研究

发布时间：2018-04-26 14:04

本文选题：多次激光自混合干涉 + 绝对距离测量　；参考：《东北石油大学》2017年硕士论文

【摘要】：激光自混合干涉测量技术,是利用外界反馈光对激光器输出特性的影响而形成的一种新型光学精密测量技术。随着现代光电子技术、光纤通信技术以及传统干涉技术的快速发展,激光自混合干涉技术被广泛应用于距离、形貌、位移、振动等不同参数的测量。随着航空航天和船舶工业的发展,绝对距离的测量一直受到广泛关注,对高精度绝对距离的测量提出了实际的需求。本文从激光自混合干涉原理出发,重点研究了激光测距的原理及线性调频的方法,深入分析了多次反馈激光自混合干涉的形成机理,从原理结构上提出了一种利用二次反馈激光自混合测距的方法。有效的解决了在传统测距方法中测量精度和硬件设计之间的矛盾。在不增加光学信号处理电路的复杂度以及成本的基础上利用光程加倍,实现了步长分辨率精度的提高,进而实现测量精度的提升。主要研究内容包括:首先,基于三镜腔等效模型和Lang—Kobayashi速率方程,建立激光自混合干涉理论的分析模型。在此基础上提出多次反馈激光自混合干涉理论,得出多重反馈激光自混合干涉光波与外腔光波波动的关系。其次,介绍了激光自混合干涉绝对距离测量的原理,对常用激光自混合测距的方法进行了对比分析。在此基础上,提出了二次反馈激光自混合测距的方法,从激光器出射光强出发,推导出基于二次反馈激光自混合绝对测距的测量方程。然后,设计和搭建了多次反馈激光自混合干涉的测距实验平台,主要包括激光器的选取、激光器精密电流源与温度控制器的使用、以及数据采集处理等。最后,基于搭建的实验平台,对提出的方法进行了可行性分析。
[Abstract]:Laser self-mixing interferometry is a new type of optical precision measurement technology, which is formed by the influence of external feedback light on the output characteristics of the laser. With the rapid development of modern optoelectronic technology, optical fiber communication technology and traditional interference technology, laser self-mixing interferometry is widely used in the measurement of distance, morphology, displacement, vibration and other parameters. With the development of aerospace and shipbuilding industry, the measurement of absolute distance has been paid more and more attention. Based on the principle of laser self-mixing interferometry, the principle of laser ranging and the method of linear frequency modulation are studied in this paper, and the formation mechanism of multi-feedback laser self-mixing interference is deeply analyzed. In this paper, a method of self-mixing ranging with secondary feedback laser is proposed from the principle structure. The contradiction between measurement precision and hardware design in traditional ranging method is solved effectively. On the basis of using optical path doubling without increasing the complexity and cost of optical signal processing circuit, the resolution accuracy of step size is improved and the measurement accuracy is improved. The main contents are as follows: firstly, based on the three-mirror cavity equivalent model and Lang-Kobayashi rate equation, an analytical model of laser self-mixing interference theory is established. On this basis, the theory of multiple feedback laser self-mixing interference is put forward, and the relation between multi-feedback laser self-mixing interference light wave and external cavity light wave is obtained. Secondly, the principle of absolute distance measurement by laser self-mixing interferometry is introduced, and the methods of laser self-mixing range measurement are compared and analyzed. On this basis, a method of self-mixing laser self-mixing ranging with secondary feedback is proposed. The measurement equation of self-mixing absolute distance measurement based on secondary feedback laser is derived from the light intensity of the laser. Then, the experimental platform of multiple feedback laser self-mixing interferometry is designed and built, including the selection of laser, the use of laser precise current source and temperature controller, and the data acquisition and processing. Finally, based on the experimental platform, the feasibility of the proposed method is analyzed.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN24

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