The active control of 30-m ring interferometric telescope (RIT) needs edge sensing and tip sensing when its primary mirr......

The precise alignment of a high-performance telescope is a key factor to ensure the imaging quality. However, for telesc......

Dispersed fringe sensors are a promising approach for sensing the large-scale physical step between adjacent segments wi......

A method for the design of an unobscured reflective zoom system with three mirrors is described. This method applies the......

A novel lens system with correction of secondary spectrum without using anomalous glasses is presented. The lens system ......

The Ronchi grating is applied to measure the large-aperture aspheric surfaces in a quantitative way on the basis of self......

We propose a sub-aperture stitching algorithm based on a frequency domain that can be denoted as a power spectral densit......

An angular trapezoidal phase mask used for a wideband coronagraph is proposed. The azimuthal phase of the mask is double......

Phase diversity (PD) is a kind of wavefront sensing technology based on image collecting and post-processing. We apply t......

The performance of space hyper spectral imager is severely affected by turbulent orbit temperature. Turbulence results i......

The images recorded by a ground-based telescope are often degraded by atmospheric turbulence and the aberration of the o......