摘要
通过研究激光在湍流大气中的传输情况,旨在为光学高分辨率干涉成像提供理论依据。采用相位屏的近似处理方法对激光通过大气湍流传输进行模拟,研究激光通过湍流大气的干涉情况。试验结果表明:孔径间距越大,干涉条纹越密;在传输距离为2 km,大气湍流折射率结构常数C2n为1-0 14,即接近强湍流的情况下,可以形成比较好的干涉条纹。孔径间距较小时,干涉的明暗条纹清晰可见。在实际干涉成像中,可以选择适当的孔径间距来获得较好的干涉条纹,从而获得目标的高分辨率像。
In order to provide a theoretical base for high resolution optical coherent imaging, the interference of laser beam transmitting in the turbulent atmosphere for a certain distance is studied. The approximation method of phase screen was used to simulate laser beam transmission in turbulent atmosphere, and its interference in turbulent atmosphere was investigated. The simulation indicates that the longer the distance between apertures is, the closer the interference fringes are; good interference fringes are formed when transmission distance is two kilometers and atmospheric turbulence refractive index structure coefficient C^2n is 10^-14, which is close to strong turbulence. The interference fringes are clear if the apertures are closer. Therefore, proper distance between the transmit apertures could be selected to get better interference fringes and high resolution images.
出处
《应用光学》
CAS
CSCD
2006年第4期312-314,共3页
Journal of Applied Optics
基金
国防科技重点实验室基金资助项目(51476030304DZ0201)
关键词
相位屏
大气湍流
光学高分辨率干涉成像
phase screen
atmospheric turbulence
high-resolution coherent imaging
