Patent ID: 7276717
Filing Date: 2007-10-02
Classification: G03F

Abstract:
1. A measuring apparatus for measuring optical performance of a target optical system to be measured, said measuring apparatus comprising: an optical unit for splitting light from a light source into measuring light and reference light so that the measuring light can be introduced into the target optical system; a reflection unit for reflecting the measuring light from the target optical system toward the target optical system via a fluid; and a detector for detecting an interference fringe generated between interference between the measuring light that has emitted from the target optical system after being reflected by said reflection unit and the reference light that does not pass the target optical system; wherein said reflection unit is a condenser optical system that provides a condensing point on an image plane of the target optical system; and wherein the fluid meets V>D×X, where V is a constant moving speed of the fluid, D is a maximum width (mm) of the measuring light in the fluid, and X is a detecting frame rate (Hz) of said detector.