Dynamic Interferometric Measurements Employing a Pixelated Polarization Sensor and FFT Spatial-Temporal Filtering Techniques

摘要

We implemented a Michelson interferometer capable of following temporal phase variations. The system uses polarization phase shifting techniques and is coupled to a pixelated polarization sensor. Due to the space-time stability obtained, the system allows a 3D FFT phase demodulation algorithm that combines the spatial carrier imparted by the pixelated polarization mask and a low pass filtering in time. In the system implementation, we reduced the usage of polarization components by observing the back propagated interferogram and, in the speckle reduction part, a laser combined with a spatial filter and a speckle reducer commonly employed for projection. Experimental results demonstrating the enhancement in space and time are presented.