基于光纤振动幅度的激光散斑控制
Laser speckle control based on fiber optic vibration amplitude
贺锋涛 1左波 1张冠芳1
作者信息
- 1. 西安邮电大学电子工程学院,陕西西安710121
- 折叠
摘要
实验以单片机AT89C51为核心控制器件,采用AD9850型DDS器件产生幅度可调的正弦波信号,再经ULN2003驱动器驱动音圈电机振动,从而控制光纤振动.通过控制光纤振动幅度实现了激光成像系统中激光散斑噪声的控制.在正弦波频率一定、电压幅度不同(即光纤振动幅度不同)的条件下,采集抛光玻璃表面显微图像,通过计算图像平均对比度分析散斑噪声.在电压幅度0 ～3.0V振动范围内,随着电压幅度增加,图像散斑的平均对比度整体趋势减小,并在电压幅度2.2V时平均对比度获得了最小值0.06,达到了良好的散斑控制.通过控制光纤振动幅度达到了良好的散斑控制效果.
Abstract
AT89C51,as the core control devices in the experiment,can be used to control the vibration of optical fiber through the adjustable amplitude sine wave signal that is generated by AD9850 DDS and the voice coil motor vibration from ULN2003 driver.The laser speckle noise is reduced by controlling fiber optic vibration amplitude.In the case of constant frequency and different voltage amplitude (different vibration amplitude of fiber-optic),the microscopic images of the polished glass surface are collected to analyze the speckle noise by calculating their average contrast ratio.Within the range of 0 ～ 3.0V of the voltage amplitude,the overall tendency of average contrast ratio of image speckles decreases with increasing of voltage amplitude,and reaches the minimum value that the voltage is 0.15V by controlling the speckle noise.By controlling the fiber optic vibration amplitude it got good effect.The excellent performance of speckle control is achieved.
关键词
单片机/AD9850/散斑对比度Key words
single chip computer/AD9850/speckle contrast引用本文复制引用
基金项目
国家自然科学基金资助项目(61201193)
陕西省自然科学基金基础研究计划资助项目(2012JQ8014)
出版年
2015
NETL
NSTL
维普
万方数据