Knowledge Corner

SpotOptics is pleased to present information on the principles of their wavefront sensors and wavefront sensor based systems. You can learn more on Zernike polynomials, Shack Hartmann wavefront sensor comparison with interferometers, aberrations and photo gallery on aberrations. FAQ on SH test is also available

Questions on Shack-Hartmann test

What is the Shack-Hartmann test and how is it different from the Hartmann test?

It is an extension of the Hartmann test. In the Hartmann test, a screen with holes is put in front of the primary mirror, and a photographic plate is placed near the telescope focus to record a pattern of spots. An analysis of the position of these spots gave the aberrations of the telescope.