相位光栅型曲率传感器的波前校正算法  

Reconstruction algorithm for wavefront curvature sensor with phase grating

作　　者：黄盛炀[1] 习锋杰[1] 宁禹[1] 刘长海[1] 姜宗福[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,长沙410073

出　　处：《强激光与粒子束》2011年第10期2573-2577,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(60908027)

摘　　要：针对相位光栅曲率传感器能够测量波前曲率在光瞳面上分布的特点,提出了一种采用整个空间分布的曲率信号来实现波前校正的算法。用曲率型变形镜影响函数的曲率信号在光瞳面上的分布来拟合待校正波前的曲率信号,采用最小二乘方法得到变形镜的控制电压,实现波前校正过程。数值模拟了一种41单元曲率型自适应光学系统采用该算法的波前校正过程。结果表明,对4至28阶Zernike像差体现了校正效果,对曲率为0的Zernike像差校正效果略好于曲率不为0的Zernike像差。与传统分区法的校正效果相比,整体法对Zernike像差的校正效果基本相当。整体法无需对光瞳面上的曲率信号进行与电极分布相同的分区,降低了对系统校准的要求。An algorithm is proposed to reconstruct wavefront using the whole spatial distribution of curvature signals mea-sured by curvature sensor with grating.The curvature signal＇s spatial distributions of curvature deformable mirror＇s response functions are used to fit the measured curvature signal,the control voltages are obtained by the least square method,and then the distorted wavefront is corrected.A 41-element curvature adaptive optic system is simulated to correct the distorted wavefront by the whole signal algorithm.The results show that the 4th to 28th order Zernike aberrations can be corrected,and Zernike aberrations with zero curvature can be reconstructed more accurately than the ones with non-zero curvature.Compared with the signal-divided algorithm,the whole signal algorithm gets a similar performance for correcting Zernike aberrations.And in the whole signal algorithm,the demand of calibration is reduced for the curvature distribution is not necessary to be divided for sensing.

关 键 词：自适应光学 曲率型自适应光学系统 相位光栅型曲率传感器 波前校正算法 Zernike像差 

分 类 号：O438[机械工程—光学工程]