Aero-optical wavefront measurement technique based on BOS and its applications

作     者：TIAN LiFeng YI ShiHe ZHAO YuXin HE Lin CHEN Zhi 

作者机构：College of Aerospace and Material Engineering National University of Defense Technology Changsha 410073 China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2011年第56卷第22期

页      面：2320-2326页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

主　　题：波前像差 测量技术 气动光学 超音速混合层 时间分辨率 应用 背景图像 折射指数 

摘      要：A collimated light beam will be refracted if it propagates through a flow-field with index-of-refraction variations,and its wavefront will be *** we measure the deflection angle of the light beam,the gradient of the wavefront can be obtained using the Malus law,and the wavefront aberration can be computed with a reconstruction *** characteristics of background oriented schlieren(BOS) are conducive to wavefront aberration measurement:BOS can be used to measure the deflection angle of a light beam by measuring the displacement field between the reference image and the experiment ***,in a BOS system of Schlieren mode,only the ray perpendicular to the background image can be captured with a *** is helpful to measure wavefront aberrations that occur after a planar wavefront has passed through the *** on these characteristics of BOS of Schlieren mode,a new wavefront measurement technique,which is called the BOS-based wavefront technique(BOS-WT),is proposed in this *** works by constructing the relationship between the displacement of the background image and the aero-optical wavefront gradient and uses the Southwell wavefront reconstruction algorithm.A BOS-WT system was assembled,and its temporal resolution was found to be 6 ns,and its temporal-correlation resolution reached 0.2 μs.A BOS-WT can measure the time-correlation transient wavefront *** is simple and easy to *** this paper,we also present a study of the aero-optical performance of supersonic mixing layer based on our BOS-WT transient wavefronts at an interval of 5 μ*** results showed the wavefront was transient and distorted after it had passed through the mixing *** the analysis of the data at the 5 μs interval,the temporal evolution of wavefront can be obtained.