Precise wavefront sensor-based metrology since 1996.
Puntino: optimize telescope performance with a powerful set of tools. Cover focal ratios from f/5 to f/18
Output results from Sensoft analysis are the table with the Zernike coefficients (at left in the figure below) and several graphs.
An important feature in Sensoft is the wavefront map reconstruction, where the user can select and see in the map the effect of any aberration(s): when Defocus, Tilt and Astigmatism are mathematically removed, the typical 3-point structure of Triangular Coma (213 nm) is quite evident in the wavefront (see figure above). The conclusion is that the 3-point clamp generates stress in the lens, whose consequence is a relevant amount of Astigmatism and Triangular Coma.
When the 3-point clamp is removed Astigmatism is much smaller and Triangular Coma is negligible (see figure below).
A 1.5m mirror telescope was analyzed with SpotOptics wavefront sensor Puntino and Sensoft software in 1996. Since the Telescope has an annular pupil, the Annular Zernike polynomials were implemented in Sensoft together with the Standard Zernike, Fringe Zernike and Seidel polynomials After the calculation of the Annular Zernike aberration terms, the wavefront was reconstructed mathematical removing all of the Zernike terms (this is a feature of our software Sensoft): the resulting mirror surface map (left) clearly follow the mirror support map (right).