Zobrazeno 1 - 5
of 5
pro vyhledávání: '"Weihong Song"'
Publikováno v:
SPIE Proceedings.
Generally, in order to gain high accuracy in aspheric testing, a piece of high-quality CGH (computer generated hologram) is inserted behind transmission sphere to generate specified wave-front to match aspheric part. According to the difference in fu
Publikováno v:
SPIE Proceedings.
Freeform optics provide excellent performance for a wide variety of applications. However, obtaining an accurate freeform surface measurement is highly challenging due to its large aspheric/freeform departure. It has been proven that SCOTS (Software
Publikováno v:
SPIE Proceedings.
We propose a sampling method to measure surface roughness of circular flat in this paper. The steps of this method are described in following. First, the number of sampling points is determined based on the radius of the circular flat; then the sampl
Publikováno v:
SPIE Proceedings.
We have provided a comparative analysis of methods that involves multi-angle averaging, pseudo multi-angle averaging, single-rotation and variants based on the combinations. All these methods require measurement results being determined at rotational
Publikováno v:
SPIE Proceedings.
Absolute test of spherical surfaces has been widely used because of increased demand on metrology accuracy. We demonstrate the validity of an absolute test method with shift and rotation procedure that has been proposed earlier. The method relies on