One-shot shape measurement of small objects with a pulsed laser and modulation of polarization

We present an alternative shape measurement setup based on a one-shot phase-shifting method employing the modulation of polarization and phase grating interferometry. The setup implementation was carried out with a Mach–Zehnder interferometric arrangement and a synchronized system of a pulsed laser and a fast camera. Under the proposed configuration, a test object is illuminated by two beams of circularly polarized light oppositely rotating, coming from the interferometric arrangement. The reflected light is then conduced to a phase grating interferometry system to generate several phase-shifted fringe patterns in one-shot. To show the feasibility of our proposal, we present some experimental results of a retrieved wrapped phase of a test object and analyzed it using a quality-guide phase unwrapping algorithm to obtain the continuous phase.