48级灰度线性声光调制器驱动源及其通信系统研究

发布时间：2018-01-15 17:44

本文关键词：48级灰度线性声光调制器驱动源及其通信系统研究　出处：《中北大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着激光技术的迅速发展以及优质声光晶体材料的不断开发,基于声光互作用原理的声光器件已广泛应用于激光大屏幕图文显示、激光外差干涉技术和其他高精度测量等领域。集衍射效率高、工作频率高等诸多优点的布喇格型声光调制器是目前普遍使用的一种声光器件。为了使声光调制器具有良好的工作性能,针对布喇格型声光调制器设计了一种衍射光强灰度值随数字调制电压成线性变化的48级灰度线性声光调制器驱动源。该声光调制器驱动源的电路设计主要包括两大模块:数字电压控制电路和射频驱动电路。数字电压控制电路的作用是为了产生48档次的数字控制电压,其经射频驱动电路中的电平转换电路进一步转化后成为48档次的数字调制电压,进而对射频驱动电路中的高频载波信号进行幅度调制,使声光调制器驱动源输出相应的射频驱动信号并驱动声光器件。通过声光调制实验得到对应的衍射光强灰度值并显示相应的灰度等级。实验结果表明,衍射光强灰度值与数字调制信号成非线性关系。针对声光器件固有的非线性特性,通过线性电压补偿技术得到补偿后的衍射光强灰度值与数字调制电压的线性相关系数为97.73%,比补偿前提高了7.06%,灰度等级增至48级,比补偿前增加了18个等级。之后,通过音频声光通信实验测试了该系统对音频信号的传输性能,实验结果表明:在一定的幅度变化范围内,所设计的音频声光通信系统具有非常好的线性传输性能。
[Abstract]:With the rapid development of laser technology and the continuous development of high quality acousto-optic crystal materials, acoustooptic devices based on acousto-optic interaction have been widely used in large laser screen graphics and text display. Laser heterodyne interferometry and other areas of high precision measurement. High diffraction efficiency. Bragg type acoustooptic modulator, which has many advantages such as high operating frequency, is a widely used acousto-optic device. In order to make the acousto-optic modulator have good performance. For Bragg acousto-optic modulator, a 48-stage gray linear acousto-optic modulator driving source is designed, in which the intensity of diffracted light varies linearly with the digital modulation voltage. The circuit design of the acousto-optic modulator mainly includes the circuit design of the driving source of the acousto-optic modulator. Two modules:. Digital voltage control circuit and RF drive circuit. The function of digital voltage control circuit is to generate 48 grades of digital control voltage. It is further transformed into 48 grades of digital modulation voltage by the level conversion circuit in the RF drive circuit, and then the amplitude modulation of the high frequency carrier signal in the RF drive circuit is carried out. The acousto-optic modulator can output the corresponding RF driving signal and drive the acousto-optic device. The corresponding intensity gray value of diffractive light is obtained by acousto-optic modulation experiment and the corresponding gray scale is displayed. The experimental results show that. The intensity of diffractive light has a nonlinear relationship with the digital modulation signal, aiming at the inherent nonlinear characteristics of acousto-optic devices. The linear correlation coefficient between the intensity of diffractive light and the digital modulation voltage is 97.73 by linear voltage compensation, which is 7.06 higher than that before compensation, and the grayscale is increased to 48. After that, the transmission performance of the system to audio signal is tested by audio acousto-optic communication experiment. The experimental results show that the system is in a certain range of amplitude change. The designed audio acoustooptic communication system has very good linear transmission performance.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN65

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