水平圆管自然对流的大剪切实时干涉测温

The real time interference temperature measurement of with large shearing for natural convection around horizontal circular cylinders

利用具有大剪切量的横向剪切干涉法获得了有限长的水平圆管在自然对流条件下的稳态以及降温过程的实时条纹,提取出条纹相位以及背景条纹相位并将两者求差得到相位差分布,给出了经过端部效应修正后的温度场分布.实验结果表明:利用具有大剪切量的横向剪切干涉法获得的实时干涉条纹类似于利用马赫-曾德干涉仪获得的简单条纹,可以简单而精确地提供全场温度分布;圆管温度场具有很好的对称性;当圆管壁面温度处于30～95℃范围内时,取修正系数为0.88进行端部效应修正所得温度反演误差不足1K.

The real-time fringes during steady state and temperature decreasing processes of natural convection around finite length horizontal circular cylinder were obtained using lateral shearing interferometry（LSI） with large shearing quantity.The phases of fringes and background fringes were extracted and the phase difference distribution was obtained.The temperature distribution after edge effect correction was provided.The above experiment and analysis indicate that the similar simple real-time fringes using Mach-Zehnder interferometry can also be obtained by LSI with large shearing quantity.The all-field temperature distribution can be simply and precisely provided,the effective range of temperature field has very good symmetry.The temperature inversion error is less than 1 K using correction factor 0.88 for edge effect correction when the surface temperature of the circular cylinder is between 30 ℃ and 95 ℃.