Geometric Theory of Moving Grid Wavefront Sensor.

摘要

A geometric optics analysis is made for a wavefront sensor that uses a moving Ronchi grid. It is shown that by simple data processing a signal proportional to the gradient of the distorted wavefront can be obtained for each element of an array of photodetectors that cover the entire image of a telescope aperture. The effect of diffraction is calculated for this system. This shows the limitations and provides a justification for the geometric analysis. (Author)