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为了适应大测试区的相位物体的测试研究和控制光学系统的成本,设计出双光收缩式径向剪切干涉光学系统。通过实验得到干涉条纹,用CCD摄入计算机,经Matlab编制傅里叶变换、相位去包裹和其他数值计算程序,解调干涉条纹的相位,计算出温度扰动产生的波面畸变量,它等于折射率变化引起的相位偏移值,用轴对称气体温度场重建方法,再现了气体温度场一个层面上的温度分布。实验结果与铜康铜微型热电偶单点测温相比较,两者相差不大。实验表明该系统具有较高的精度和测试灵敏度,适于环境温差较小的相位物体热物理量的测量。
In order to meet the large test area of the phase object of the test research and control the cost of the optical system, designed a double optical contraction radial shear interference optical system. The interference fringes were obtained by experiments. The computer was taken into the computer by CCD. The Fourier transform, phase unwrapping and other numerical calculation procedures were compiled by Matlab. The phase of interference fringes was demodulated and the wave distortion caused by temperature disturbance was calculated. It was equal to the refractive index The phase shift value caused by the change reappears the temperature distribution on one level of the gas temperature field with the method of reconstruction of the temperature field of the axisymmetric gas. The experimental results and Tongkang copper micro-thermocouple single-point temperature measurement compared with the two little difference. Experiments show that the system has high accuracy and test sensitivity, and is suitable for the measurement of thermal physical quantities of phase objects with small temperature difference.