|The following data was obtained using
a Zygo Laser Interferometer (@632.8nm) to measure the influence of
a freely suspended TurboFilm sample on the 100mm diameter
transmitted wavefront. The first strip shows the interference
fringes of the Zygo test reference surface with and without the
TurboFilm. The resulting point spread functions (PSF) were
then calculated from these results and are shown below the fringe
views. These simulate the resulting view of a star at a
telescope's focus. The resulting Strehl Ratio has also been
calculated from the RMS value and listed below the star images.
At the bottom are the respective 3D plots that further illustrate
the wavefront surface. For comparison purposes, a similarly
mounted 12micron MylarTM
film has also been included.
The sample of TurboFilm achieved a
wavefront RMS (and Strehl) better than many amateur telescopes.
The MylarTM sample
distorted the wavefront well beyond the permissible diffraction
limit. Since AstroSolar is based on the TurboFilm substrate,
the optical performance of AstroSolar provides identical results. These results show that TurboFilm
and AstroSolar are very well suited
for high resolution optical applications. Please note that the results are
dependent on how the film is mounted. All strain and folds
must be avoided, in order to prevent the potential for distortions
in the wavefront. For an easy way to achieve this with a
simple, inexpensive cell, please click on constructing
a simple and inexpensive cell.
Anschrift: Paul Pleiger Maschinenfabrik GmbH & Co. KG
Dipl.-Phys. Peter Rucks