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公开(公告)号:US07453581B2
公开(公告)日:2008-11-18
申请号:US10578652
申请日:2004-11-02
IPC分类号: G01B11/24
CPC分类号: G01M11/0292 , G01M11/0221
摘要: The focus of an optical system (20) can be determined in a reliable and accurate way by arranging a first and second test object (62,64) having a periodic structure at different sides of the focal plane (66) of the optical system and determining the difference in modulation depth of the images formed on different areas (32,34) of a radiation-sensitive detection system (30).
摘要翻译: 可以通过在光学系统的焦平面(66)的不同侧布置具有周期性结构的第一和第二测试对象(62,64),以可靠和准确的方式来确定光学系统(20)的焦点, 确定在辐射敏感检测系统(30)的不同区域(32,34)上形成的图像的调制深度差异。