公开(公告)号：US06657724B1

公开(公告)日：2003-12-02

申请号：US09530265

申请日：2000-05-16

Applicant: David J Dunstan ,  Mark D Frogley

Inventor： David J Dunstan ,  Mark D Frogley

IPC: G01J312

CPC classification number: G01J3/44 ,  G01J3/18

Abstract: An optical filter is provided in the form of a subtractive double monochromator. In each dispersive stage, a concave mirror focuses light between a diffraction grating and a transfer mirror between the stages. Light which misses the transfer mirror is rejected. To reduce aberrations over a wide bandwidth, the radius of curvature R of the mirror is centered on the grating and the transfer mirror has a radius of curvature R/2 and is located midway between the mirror and the grating. The mirror 34 thus coincides with the locus of the focus of the spectral image in both stages.

Abstract translation: 滤光器以减色双色单元的形式提供。 在每个色散阶段，凹面镜将光线聚焦在衍射光栅和阶段之间的转印镜之间。 错过传输镜的光线被拒绝。 为了减小宽带宽上的像差，镜的曲率半径R以光栅为中心，传输镜具有曲率半径R / 2，并位于反射镜与光栅之间。 因此，反射镜34在两个阶段中与光谱图像的焦点的轨迹重合。