当利用一块菲索干涉镜和一块未镀铝的参考平面检测镀铝光学平面时,条纹对比度非常低。同时,亩于测试表面和参考表面的反射率不一样,常常检测不准。这可以利用一种较简单的方法来解决。把一张擦镜薄纱片(如Kodak或Whatman公司生产的那种)放在镀铝的平面上。这种薄纱片的材料是由精细的、纤维间带有清晰空隙的、间距和方位都不规则的纤维编成的。一部分光,像透过镜片似的通过 Streak contrast is very low when detecting an aluminized optical plane with a FESO interferometer and an unplated reference plane. At the same time, mu in the test surface and reference surface reflectance is not the same, often not allowed to detect. This can be done in a simpler way. Put a glitter sheet (like Kodak or Whatman) on an aluminum flat surface. The material of this tissue is made of fine fibers with clear spaces between fibers and with irregular spacing and azimuth. Some light, like through the lens like through