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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 | |
| Aparece en las colecciones: | Articulos Arbitrados 2011 |
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| Fichero | Tamaño | Formato | |
|---|---|---|---|
| Harmonics rejection in pixelated interferograms using spatio-temporal demodulation.pdf | 2.23 MB | Adobe PDF | Visualizar/Abrir |