热圆柱体表面温度的干涉法测量

Interferometric Measurement of Surface Temperature of the Cylinders

介绍一种利用干涉原理测量热圆柱体表面温度的方法,首先,在对圆柱体周围空气的温度和折射率分布特点进行分析的基础上,建立Fizeau等厚干涉系统,调整光路使干涉条纹稳定且等间距。然后,将圆柱体水平放置于干涉光路中加热,记录物体加热前后干涉条纹图像,利用曲线拟合和轮廓跟踪算法对图像进行处理,进而计算出紧靠圆柱体表面处空气的折射率。最后,利用热圆柱体附近空气温度分布的特点,以及空气温度和折射率之间的关系,确定圆柱体的表面温度。结果表明:此方法的测量精度不低于1%,温度分辨率不低于0.1 K。

A method to define the surface temperature of the cylinders was proposed based on interference principle. With analyzing the characteristics of the temperature and the refractive index of the air around them, a Fizeau equal-thickness interference system was set up, and the interference fringes have been steady and have proper space by adjusting the system. Then a cylinder was placed horizontally in the system and heated. Processing the fringe images before and after heating the hot cylinder using the arithmetic of curvefitting and contour track, we can obtain the refractive index of the air close to cylinder surface. By use of the feature of the air temperature round the hot cylinder and the relation between the refractive index and the temperature of the air, the surface temperature of it can be determined. The temperature resolving power of this method is better than 0.1 K and temperature measurement accuracy exceeds 1%.