径向剪切干涉法测量气体温度场

提出双Fresnel波带板共光路径向剪切干涉测量系统，导出该光路系统下的待测波面的计算方法。用该系统对轴对称气体温度场进行实验测试，采集气体温度扰动的干涉条纹图，经傅里叶变换解调相干波相差，求解扰动波面及扰动引起的波面差，重建气体温度场。结果表明双Fresnel波带板径向剪切干涉系统具有较高的测量精度和测量灵敏度，适合横向尺度较大、纵向尺度（光传播方向）较小，与环境最大温差较小时的位相物体的测量研究。

RADIAL SHEARING INTERFEROMETRY FOR MEASURING THE GAS TEMPETATURE FIELD

A new radial shearing interferometry optical system with two Fresnel zone plates is presented, and according to this system, the method to recover the original wavefront was deduced. In order to use this optical system to test the phase object, experiments for measuring the temperature field of air on top of a clubbed hot copper was im- plemented. By Captured the interference pattems and computed the difference of wavefront, the temperature field was recovered. Result is comparative to that of heat electric couple. It is shown that this optical system is sensitive and fit for measuring the phase object which cross section is broader but length along the light way is shorter.