Improvement of the signal-to-noise ratio in interferometry using multi-frame high-dynamic-range and normalization algorithms
Por:
Restrepo, R., Uribe-Patarroyo, N., Belenguer, T.
Publicada:
1 ene 2012
Resumen:
Using both high dynamic range (HDR) and normalization methodologies, we show a method to improve the fringe pattern contrast in interferometric measurements normally used for phase recovering. In a simulated interferogram that mimics the main effects that can be found in an interferometric process (stray-light, photon noise, electronic noise, scattering phenomena, etc.) it was possible to improve the contrast of the fringes and to decrease the root mean square error by more than 35%. The method proposed is applied to experimental interferograms to measure wavefront error and retardance changes on liquid crystal (LC) devices. It is done by using a Mach-Zehnder set-up in which we used different polarization areas. The proposed method increases the quality of the phase recovered and decreases the root mean square error by 50%. © 2011 Elsevier B.V. All rights reserved.
Filiaciones:
Restrepo, R.:
Laboratorio Nacional de Instrumentación Espacial (LINES), Instituto Nacional de Técnica Aeroespacial (INTA), Ctra. Ajalvir km 4, Torrejón de Ardoz, E-28850 Madrid, Spain
Uribe-Patarroyo, N.:
Laboratorio Nacional de Instrumentación Espacial (LINES), Instituto Nacional de Técnica Aeroespacial (INTA), Ctra. Ajalvir km 4, Torrejón de Ardoz, E-28850 Madrid, Spain
Belenguer, T.:
Laboratorio Nacional de Instrumentación Espacial (LINES), Instituto Nacional de Técnica Aeroespacial (INTA), Ctra. Ajalvir km 4, Torrejón de Ardoz, E-28850 Madrid, Spain
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