The options for testing under illumination are based on the combination of Fourier Optics, beam splitter and a cooled CCD sensor head. > A suitable light source on the side of the equipement provides the illumination (extended or point source depending on the required illumination type).

> An optical relay system combined with a beam-splitter cube enables to conjugate the light source plane with the Fourier plane. The light source distribution function allows to control the angular distribution of illumination.

> The lighting through the system can extend up to the viewing cone of the Fourier lens (+/- 80° or +/- 60°).