Method of and apparatus for determining focus of an imaging system
    1.
    发明授权
    Method of and apparatus for determining focus of an imaging system 失效
    用于确定成像系统的焦点的方法和装置

    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。