The splitting of the interference rings is recorded using the MikroCam SP 3.1 microscope camera. A red filter applied to the focusing lens of the dedicated digital camera increases the contrast/depth of field for analysis of the Cd lines.The associated software (for Windows) allows both qualitative observation of the live image and quantitative analysis using screenshots and videos. The occurrence of linear or circular polarization is analyzed using the polarization filter or the quarter wavelength plate with polarization attachment. The whole experiment is built on a stable optical precision bench system.