人眼眼底成像系统中自适应光学像差校正控制模型研究

发布时间：2018-04-13 02:14

本文选题：自适应光学 + 人眼像差　；参考：《中国生物医学工程学报》2014年01期

【摘要】：对于自适应光学人眼眼底成像系统,由于人眼波前像差具有动态特性,为获得清晰、高分辨率的眼底图像,变形镜必须能够实时跟踪并补偿人眼中随时间变化的像差信息。本研究探讨自适应光学像差校正控制技术,基于自动控制理论建立自适应光学连续系统模型,分析基于纯积分、比例-积分和Smith预补偿控制器下的控制系统模型及其控制性能。在自行构建的成像系统自适应光学平台上,对10只受试人眼动态像差样本进行像差校正实验。与校正前的像差((0.862±0.088)λ,λ为0.785μm)比较,纯积分控制、PI控制和Smith预补偿控制这3种方法的校正后像差((0.154±0.033)λ、(0.133±0.026)λ、(0.103±0.011)λ)均显著降低(P0.05),表明各种控制器的像差校正系统均具备一定的像差校正能力。单因素方差分析的结果表明,Smith预补偿控制的校正后像差显著低于纯积分控制和PI控制方法,表明Smith预补偿控制器下校正后的像差具有最大的显著差异,即具有最好的像差校正效果。Smith预补偿控制模型可为实时校正人眼动态像差进而获取人眼眼底图像提供理论依据。
[Abstract]:For the adaptive optical eye fundus imaging system, because the wavefront aberration is dynamic, in order to obtain the clear and high resolution fundus image, the deformable mirror must be able to track and compensate the aberration information of the human eye with time in real time.In this paper, the adaptive optical aberration correction control technology is discussed. The adaptive optical continuous system model is established based on the automatic control theory. The control system model based on pure integral, proportional integral and Smith precompensation controller and its control performance are analyzed.An aberration correction experiment was carried out on 10 human eye dynamic aberration samples on the adaptive optical platform of the self-constructed imaging system.Compared with the pre-correction aberrations (0.862 卤0.088) 位, 位 = 0.785 渭 m), the corrected aberrations of Pi control and Smith pre-compensation control are 0.154 卤0.033 位 + 0.133 卤0.026 位 + 0.103 卤0.011 位), respectively. The results show that the aberration correction systems of all kinds of controllers have a certain aberration correction ability.The results of single factor variance analysis show that the corrected aberration of Smith precompensation control is significantly lower than that of pure integral control and Pi control, which indicates that the corrected aberration under Smith precompensation controller has the largest significant difference.Smith pre-compensation control model with the best aberration correction effect can provide theoretical basis for real-time correction of human eye dynamic aberration and the acquisition of human eye fundus image.
【作者单位】：南京航空航天大学机电学院;上海航天控制技术研究所;
【基金】：江苏省自然科学基金青年基金(BK2012380) 江苏省产学研联合创新资金(BY2012009) 中央高校基本科研业务费专项资金(NJ20120007)
【分类号】：R310

【相似文献】