Please use this identifier to cite or link to this item: http://cio.repositorioinstitucional.mx/jspui/handle/1002/463
Harmonics Rejection in Pixelated Interferograms Using Spatio-Temporal Demodulation
JOSE MOISES PADILLA MIRANDA
MANUEL SERVIN GUIRADO
JULIO CESAR ESTRADA RICO
Acceso Abierto
Atribución-NoComercial-SinDerivadas
Pixelated phase-mask interferograms have become an industry standard in spatial phase-shifting interferometry. These pixelated interferograms allow full wavefront encoding using a single interferogram. This allows the study of fast dynamic events in hostile mechanical environments. Recently an error-free demodulation method for ideal pixelated interferograms was proposed. However, non-ideal conditions in interferometry may arise due to non-linear response of the CCD camera, multiple light paths in the interferometer, etc. These conditions generate non-sinusoidal fringes containing harmonics which degrade the phase estimation. Here we show that two-dimensional Fourier demodulation of pixelated interferograms rejects most harmonics except the complex ones at {-3rd, +5th, −7th, +9th, −11th,…}. We propose temporal phase-shifting to remove these remaining harmonics. In particular, a 2-step phase-shifting algorithm is used to eliminate the −3rd and +5th complex harmonics, while a 3-step one
26-09-2011
Artículo
CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA
Appears in Collections:Articulos Arbitrados 2011

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