摘要
光束穿过液体时会在其与空气的界面处发生全反射产生遮光效应,形成圆状的遮光图样,其半径与液体折射率相关。依据遮光效应原理,以氦氖激光器为光源,搭建海水折射率测量实验装置,改进了定标方法并利用高分辨率的单反相机采集海水的遮光效应图样。通过MATLAB编程对遮光图样进行数字图像处理反演海水的折射率,实验中还测量了不同温度下海水的折射率,得到海水折射率与温度变化基本呈线性关系。研究结果表明,本实验方法易于实现,重复性好,测量精度较高,应用于海水折射率测量是可行的。
When a light beam passes through the liquid, there will be a shading effect for the total reflection at the interface between the liquid and the air, which can be formed into a round shading pattern, and the radius of the shading pattern is concerned with the liquid refractive index. Based on this principle, a device of measuring seawater refractive index is established with He-Ne gas laser as the light source, and the shading pattern is detected by a digital camera with high resolution. The refractive index of seawater is calculated by MATLAB digital image processing program. Furthermore, the relation between the refractive index and the temperature is investigated, the results indicate that there is a linear relationship between seawater refractive index and change of the temperature. Research results show that the method is characterized by its easy achievement, good repeatability and high measurement precision, the application of seawater refractive index measurement is feasible.
出处
《激光与光电子学进展》
CSCD
北大核心
2014年第12期135-140,共6页
Laser & Optoelectronics Progress
基金
中国海洋大学本科生研究发展计划(1312010212)
关键词
光学测量
遮光效应
海水折射率
温度
optical measurement
shading effect
seawater refractive index
temperature
