ShackHartmannWellenfrontsensor
The Shack-Hartmann wavefront sensor (SHWS) is an optical instrument used to measure the shape of a light wavefront by sampling it with a microlens array and recording the resulting spot pattern on a detector. If the incoming wavefront is planar, each lenslet focuses light to a spot near the optical axis; if the wavefront is distorted, spots are displaced. The array of spot displacements provides local slope measurements of the wavefront across the pupil.
A typical SHWS comprises a lenslet array, a imaging detector (such as a CCD or CMOS camera),
Shack-Hartmann sensors are widely used in adaptive optics to compensate atmospheric or other aberrations in real