电光调制实验系统的数字化研究
关键词 电光调制；锥光干涉图；CCD 摄像机；半波电压
Title The Research on Digitized Transformation of
Electro-optical Modulation Experiment System
Abstract
According to the basic principles of electro-optic effect,base on the
electro-optical modulation experiment, the CCD camera is used for
acquiring and capture light through the crystal electro-optic effect.
Comparing three common video capture technology among DirectShow,
SDK,and VFW,the VFW video capture is chosen ,and VFW workflow is
expounded.The causes of crystal conoscopic interference pattern is
described in detail. The trajectory of the dew point is fitted by the
least squares fit, and the optical axis inclination can be calculated.
The experimental is setuped according to axis interferometry . The
crystal is always maintain a parallel with the incident direction, and
the polarization direction of the polarizer and the polarizer are
parallel to the crystal x, y axis. The average gray value of the
picture obtained by CCD is used to represent the light intensity.Gray
curve is drawn by the corresponding program to measure half-wave
voltage.It provides an analytical tool for the electro-optical
modulation experiment, and the video image acquisition and analysis
system allows a more accurate experimental data.
Keywords Electro-optic modulator; conoscopic interferometry;CCD camera;
half-wave voltage 目 次
1 绪论. 1
1.1 研究背景.. 1
1.2 电光调制实验内容 1
1.3 半波电压的测量方法. 3
1.4 实验装置的不足及改进.. 4
1.5 本论文的主要内容 5
2 电光调制实验 . 6
2.1 电光效应.. 6
2.2 LiNbO3晶体的横向电光效应 8
2.3 实验系统设计 13
3 晶体的锥光干涉图 16
3.1 干涉图成因的理论分析. 16
3.2 成像特点. 17
3.3 测量光轴出露点及光轴方向 18
4 CCD 图像采集及数字图像处理软件的实现.. 22
4.1 成像系统设计 22
4.2 VC++软件坏境 22
4.3 VFW 开发包的简单介绍 . 23
4.4 最小二乘法拟合. 26
4.5 测量半波电压 27
结 论 . 29
致 谢 . 30
参 考 文 献 .. 31
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