Development of a dynamic interferometer using recycled components based on polarization phase shifting techniques

In this research, we present the results obtained with a simultaneous phase-shifting interferometric system. This system is implemented with recovered optical components from recycled electronic devices from computer's DVD readers, LCD displays and commercial projectors. Such devices are beam splitters, diffraction gratings, mirrors, lenses and linear polarizers. These components were characterized by measuring their characteristics like transmittance, reflectivity and period of the gratings employed in order to verify its potential usage in dynamic interferometric measurements systems. The implementation is based on a Polarized Michelson interferometer (PMI) coupled with a 4-f system with a 2D diffraction grating. The system is capable of generate up to nine interferograms with comparable intensities and independent phase shifts that are modulated by polarization. We report the usage of four, seven, nine and two interferograms captured simultaneously and the processing of the interferograms is done by using conventional methods for extraction of the optical phase for each case, with the four-step algorithm for four steps, the symmetric algorithm of (N + 1) phase steps for 7 and 9, when using two interferograms the relative optical phase is calculated by means of the Vargas-Quiroga method. We analyze the temporal stability of the system by capturing 40 frames and showing its variation in each pixel to prove the repeatability of the proposed system. Related experimental results obtained for static and dynamic transparent samples are presented.