Calibration of a low-cost piezoelectrical mirror for DSPI |
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| Authors: | M Asmad G Baldwin H Rabal R Arizaga M Trivi |
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| Institution: | a Physics Department, Applied Optics Group and Applied Physics Master Program, Pontificia Universidad Católica del Perú, Ap. 1761, Lima 100, Peru;b Centro de Investigaciones Opticas (CIC-CONICET), UID Optimo, Dpto. Fisicomatemáticas, Facultad, de Ingeniería, Universidad Nacional de La Plata (UNLP), Casilla de Correo 124, 1900., La Plata, Argentina |
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| Abstract: | A cheap piezoelectrically driven mirror can be easily constructed in the laboratory. It can be located in one arm of a DSPI interferometer in order to introduce a controlled phase step. A procedure to calibrate this device is shown, that is based on the evaluation of the fringes obtained with the interferometer, by mean of the cross-correlation between profiles of the fringes. To evaluate the performance of the calibrated device, the phase map of a simulated plane object is calculated, using the four-step algorithm for the images of a speckle interferogram. |
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| Keywords: | Speckle interferometry Piezoelectrical mirror Phase step |
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