声光可调谐滤波器的研究

发布时间：2018-08-13 18:15

【摘要】：光谱成像仪是把具备了光谱分辨能力的光谱技术和具备了空间分辨能力的成像技术集合在一起的一种光学仪器。在军事侦察、科学研究、宇宙探索、环境监测、航天、精细农业、安全生产、节能减排等方面有广泛的应用。光谱成像仪的核心部件是分光元件。新型的分光元件——声光可调谐滤波器（Acousto-Optic Tunable Filter, AOTF)是根据各向异性声光晶体介质中反常布拉格（Bragg）衍射原理研究制作而成的。与其它的分光元件相比较，AOTF具有：体积小、通光孔径大、入射孔径大、分光速度快、衍射效率高、全固无可移动部件、光路简单等优点。因此对AOTF的研究具有重要的意义。本文首先介绍光谱成像技术和声光可调谐滤波器的国内外研究现状，在此基础上明确本文的研究内容和意义；第二，介绍声光可调谐滤波器的工作原理。声光可调滤波器的声光晶体是二氧化碲晶体（TeO2),利用的是反常声光布拉格衍射的原理研制成的一种新型分光元件。从参量相互作用的基本方程出发，对声光可调谐滤波器的相关原理进行了详细的阐述，说明了非共线型声光可调滤波器（AOTF)的结构以及工作原理，，介绍了准确的切线平行动量匹配关系和声光可调谐滤波器（AOTF）的主要性能参数。第三，介绍压电超声换能器的工作原理。压电超声换能器是利用压电晶体的逆压电效应将信号发生源发出的电信号转换为同频率的超声波。通过对相关理论的介绍，对压电超声换能器的材料、材料的切型和压电方程进行选择。并且介绍声光器件的基本结构和原理。最后，利用多物理场耦合仿真分析软件（COMSOL Multiphysics）对压电超声换能器铌酸锂晶片的振动模式和质点的振动方向进行分析，确定质点的振动方向。同时对声光相互作用介质进行模拟仿真，研究超声波进入声光晶体后，声光晶体的变化，将对实际AOTF的研究制作具有重要的指导意义。
[Abstract]:Spectral imager is an optical instrument which combines spectral technology with spectral resolution and imaging technology with spatial resolution. It is widely used in military reconnaissance, scientific research, space exploration, environmental monitoring, aerospace, fine agriculture, safety production, energy saving and emission reduction. The key component of the spectrograph is the spectrometer. A new type of optical splitter, acousto-optic tunable filter (Acousto-Optic Tunable Filter, AOTF), is fabricated on the basis of anomalous Bragg (Bragg) diffraction principle in anisotropic acousto-optic crystal media. Compared with other optical components, AOTF has the following advantages: small volume, large aperture, large incident aperture, high speed of light separation, high diffraction efficiency, no moving parts, simple optical path and so on. Therefore, the study of AOTF is of great significance. This paper first introduces the research status of spectral imaging technology and acousto-optic tunable filter at home and abroad, and then clarifies the research content and significance of this paper. Secondly, the working principle of acousto-optic tunable filter is introduced. The acoustooptic crystal of the acousto-optic tunable filter is tellurium oxide (TeO2). A new type of optical splitter has been developed by using the principle of anomalous acousto-optic Bragg diffraction. Based on the basic equation of parametric interaction, the principle of acousto-optic tunable filter is described in detail, and the structure and working principle of non-collinear acousto-optic tunable filter (AOTF) are explained. The accurate tangent parallel momentum matching relation and the main performance parameters of acoustooptic tunable filter (AOTF) are introduced. Thirdly, the principle of piezoelectric ultrasonic transducer is introduced. Piezoelectric ultrasonic transducer uses the inverse piezoelectric effect of piezoelectric crystal to convert the electric signal from the signal source to the same frequency ultrasonic wave. The materials of piezoelectric ultrasonic transducer, the tangent type of material and the piezoelectric equation are selected by introducing the relevant theories. The basic structure and principle of acoustooptic device are also introduced. Finally, the vibration mode and particle vibration direction of lithium niobate wafer of piezoelectric ultrasonic transducer are analyzed by using multi-physical field coupling simulation software (COMSOL Multiphysics), and the vibration direction of particle is determined. At the same time, the simulation of acousto-optic interaction medium is carried out to study the change of acousto-optic crystal after ultrasonic wave entering into acousto-optic crystal, which will be of great significance to the research and manufacture of practical AOTF.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

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