The evaluation of the photometric and colorimetric characteristics of displays requires simulating different ambient lighting situations. “Real situations” may vary from no illumination to diffuse or collimated illumination.


The illumination of the sample can easily be defined by selecting the illuminant type, the intensity and distribution type (diffuse, collimated).

Based on the above described principle, a diffuse illumination is easily obtained by producing a uniform light distribution in the Fourier plane.

This leads to an independent angular distribution of incoming light on the sample. In the same way, a point source produces a collimated illumination.

The system self corrects for internal reflections.

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 equipment 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°).


  • Non-contact viewing angle measurement
  • High color accuracy
  • Resolution: 0.04°/CCD pixel
  • Cooled sensor


  • Displays
  • R&D
  • Standard compliance tests
  • Mass production

Equipment compatible with

Reflective Options