Abstract: As the travelling wave tube amplifiers are widely used on all kinds of satellites, such as communication satellites, navigation satellites and data transmission satellites, it becomes very ...

A new method utilizing matrix analysis in polar coordinates has been presented for absolute testing of skip-flat interferometry. The retrieval of the absolute profile mainly includes three steps: (1) ...

A Fizeau interferometer is described with which to test the flatness of optical surface up to 240-mm diam. A mercury mirror of suitable diameter is used as a flatness standard. A simple 240-mm diam ...