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        <title>yanding:成像质量评价:工具:平行光管:平行光管的光瞳匹配</title>
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        <description>平行光管与 DUT 的光瞳匹配

孔径光阑通过其与像之间的光学系统所成的像，称作出射光瞳，简称出瞳。出瞳是光学系统出射光线的公共出口，出瞳中心是像方主光线（或其延长线）的交点。</description>
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        <title>yanding:成像质量评价:工具:平行光管:平行光管的焦距匹配</title>
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当我们使用平行光管对 DUT 进行测试时，平行光管的准直物镜 Lcol 与 DUT 的成像物镜 Ldut 组成了一个光成像系统，靶标通过 Lcol 所成的像便是 Ldut 的物。焦距是Lcol的主要参数之一，在平行光管选型中，焦距的选择体现了对测试精度和设备体积的权衡。</description>
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平行光管均以无穷远为目标设计的，但在实际应用中，令DUT成像最清晰的物距可能为有限距。由透镜成像原理可知，当靶标位于准直物镜Lcol焦平面之外内、之内时，可分别在正、负有限距成像。靶标位置可调的平行光管，称为可调物距平行光管（或可调焦平行光管、有限共轭平行光管），如图1所示。这种平行光管可兼容更多类型的DUT，并支持离焦测试以间接测量固定后焦类型DUT的实际后焦偏移。…</description>
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        <title>yanding:成像质量评价:工具:平行光管:平行光管的结构</title>
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随着数字相机在道路车辆、飞行器、头戴显示、安防等系统中的应用日益广泛，针对远距离目标的相机测试与标定，已成为相机开发、生产、验证等环节中的必需。无论是光学实验室的场地限制，还是相机量产用自动化设备的局促空间，都使得平行光管成为</description>
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