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| 双向反射率测量中锁相放大器的设计 | |
| 引用本文： | 齐超,李岩,齐赛.双向反射率测量中锁相放大器的设计[J].光学与光电技术,2008,6(1):55-58. |
| 作者姓名： | 齐超 李岩 齐赛 |
| 作者单位： | 1. 哈尔滨工业大学,黑龙江,哈尔滨,150001 2. 哈尔滨理工大学,黑龙江,哈尔滨,150040 3. 齐齐哈尔电业局,黑龙江,齐齐哈尔,161005 |
| 基金项目： | 黑龙江省自然科学基金 , 中国博士后科学基金 |
| 摘 要： | 均匀材料表面除镜反射方向的其他散射方向光辐射强度都较微弱.采用信号参量估计中行的最大似然估计,应用相关检测技术,利用被测信号与背景噪声不相关特性,设计了适于微弱光电信号检测的装置--锁相放大器.对金刚砂反射天顶角-55°～55°范围测量的实验结果与双向反射率(BRDF)模型比较显示,在可见光0.632 8 μm波段,误差为3.43%;近红外1.34 μm波段,误差只有0.01%.该锁相放大器适用于材料表面双向反射率的测量. |
| 关 键 词： | 双向反射率 弱信号 相关检测 噪声 锁相放大器 |
| 文章编号： | 1672-3392（2008）01-0055-04 |
| 收稿时间： | 2007-06-15 |
| 修稿时间： | 2007-11-08 |
Design of Lock-In Amplifier in the Bi-Directional Reflectance Measurement |
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| QI Chao,LI Yan,QI Sai.Design of Lock-In Amplifier in the Bi-Directional Reflectance Measurement[J].optics&optoelectronic technology,2008,6(1):55-58. | |
| Authors: | QI Chao LI Yan QI Sai |
| Institution: | QI Chao Harbin Institute of Technology,Harbin 150001,China LI Yan Harbin University of Science , Technology,Harbin 150040,China QI Sai Qiqihar Electric Power Company,Qiqihar 161005,China |
| Abstract: | The radiation intensity of scattered light from the surface of uniform material is weak except for the mirror reflection direction. In this paper, an apparatus for detecting the small photo-electricity signal, lock-in amplifier is designed by using the most likelihood signal parameters estimation, the technology of correlative detection and the incoherence property between signal and noise. Comparison of BRDF model with the experimental results of the measurements on silicon carbide paper within the －55°～55°of reflectance zenith angle shows that the error is 3.43% at the visible 0.632 8 μm and only 0.01% at the near infrared 1.34 μm. It is demonstrated that lock-in amplifier is fit for the detection of bi-directional reflectance of the material surface. |
| Keywords: | hi-directional reflectance weak signal correlative detection noise lock-in amplifier |
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