参考光为平面波和球面波时焦距检测对比研究

发布时间：2018-01-06 09:38

本文关键词：参考光为平面波和球面波时焦距检测对比研究　出处：《激光技术》2017年03期 　论文类型：期刊论文

【摘要】：为了研究参考光波面形状对于测量透镜焦距值的影响,采用数字全息的方法进行了理论分析和实验验证。通过在两种色光下进行实验,分别测量出参考光为平面波和球面波时的焦距值,并与标称值和理论计算值进行了比较。结果表明,当参考光为平面波时,测量到的透镜焦距值与标称值和理论计算值相对误差在5%以上;而当参考光为球面波时,与两者的相对误差均在2%以下,因此当参考光为球面波时所测量的焦距值精度更高;通过计算得出这两种参考光所测量的焦距值都在理论焦深范围内,故利用测量焦距值对全息图进行重构时所获得的再现像与用标称值和理论计算值所得到的再现像质量相当。这一结果对测量透镜焦距值和数字全息图重建方面有一定的帮助。
[Abstract]:In order to study the influence of the shape of the reference light wave surface on the measurement of lens focal length, the theoretical analysis and experimental verification are carried out by using digital holography, and the experiments are carried out under two kinds of color light. The focal length of the reference light is measured when the reference light is a plane wave or a spherical wave, and compared with the nominal value and the theoretical calculated value. The results show that the reference light is a plane wave. The relative error between the measured focal length value and the nominal value and the theoretical calculation value is more than 5%. When the reference light is spherical wave, the relative error between them is less than 2%, so the accuracy of focal length measured when the reference light is spherical wave is higher. It is found that the focal length measured by these two kinds of reference light is within the theoretical focal depth range. Therefore, the reconstructed images obtained from the reconstruction of holograms by measuring focal length are comparable to those obtained by using nominal values and theoretical calculations. This result is useful for measuring focal length of lens and reconstruction of digital holograms. A certain amount of help.
【作者单位】：昆明理工大学理学院;
【基金】：国家自然科学基金资助项目(61465005;61540075;61565011) 云南省级人培基金资助项目(KKSY201407082;KKSY201307134) 云南省科技计划资助项目(2013FB025;2014FB132) 云南省高等学校卓越青年教师特殊培养资助项目(1096826901)
【分类号】：O438.1;TH74
【正文快照】： 引言透镜是组成光学系统的主要元件。全息术[1-6]中,物体到电荷耦合器件(charge-coupled device,CCD)[7-8]的距离在重构再现像中是一个重要参量。对于投影尺寸远大于CCD面阵尺寸的物体,为较好接收物光场信息,选择合适的光学系统对物光场进行变换是常采用的手段。这时,光学系统

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