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    • 3. 发明授权
    • Oblique incidence interferometer with fringe scan drive
    • 倾斜入射干涉仪带边缘扫描驱动
    • US5786896A
    • 1998-07-28
    • US650994
    • 1996-05-21
    • Masatoshi Hizuka
    • Masatoshi Hizuka
    • G01B9/02G01B11/30
    • G01B9/02022G01B9/02032G01B2290/30G01N21/8806
    • An oblique incidence interferometer capable of fringe scanning by use of a fringe scan drive association with a first or second diffraction grating member of the interferometer to drive the associated grating member step by step over a micrometric distance in a direction perpendicular to a path of light in travel in a straightforward direction. Laser light from a light source 20 is diffracted into a zero order diffraction wave L1 in travel in a straightforward direction and a +1 order diffraction wave L2 by a first diffraction grating member 26 of a grating assembly 41. The grating assembly 41 is vertically movably supported on a surface plate 42 by a pair of level support members 43 each having a stratified leaf spring structure. The grating assembly 41 sits on a piezoelectric actuator 45 which serves as a fringe scan drive for driving the first diffraction grating member 26 over a micrometric distance in the vertical direction. As the first diffraction grating member 26 is moved in a direction perpendicular to the light path of incident light, +1 order diffraction wave incident on a specimen 28 is shifted in phase, causing a displacement of a predetermined extent to interference fringes as observed through an image sensor 32.
    • 一种倾斜入射干涉仪,其能够通过使用与干涉仪的第一或第二衍射光栅构件的边缘扫描驱动关联来边缘扫描,以在垂直于光路径的方向上逐步地在微米距离上驱动相关联的光栅构件 行进在一个直接的方向。 来自光源20的激光通过光栅组件41的第一衍射光栅构件26在直线方向行进和+1阶衍射波L2衍射成零级衍射波L1。光栅组件41可垂直移动 通过一对具有层状板簧结构的水平支撑构件43支撑在平板42上。 光栅组件41位于压电致动器45上,压电致动器45用作在垂直方向上以微米距离驱动第一衍射光栅元件26的边缘扫描驱动器。 当第一衍射光栅元件26在与入射光的光路垂直的方向上移动时,入射到样本28上的+1级衍射波相位偏移,导致预定范围的位移与干涉条纹的位移,如通过 图像传感器32。