Artículo
Enhancing detection of low-coherence interferometry signals acquired with a spatial heterodyne detector
Fecha de publicación:
11/2022
Editorial:
Elsevier Science
Revista:
Optics Communications
ISSN:
0030-4018
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The use of low-coherence interferometry for industrial applications is constantly growing due to its non-destructive nature and high resolution. Fourier domain systems are usually preferred as they provide a scanning-free method. Recently, a spatial heterodyne detector has proved to be useful in extending the measuring range without losing the micrometric resolution. This system Fourier transforms the interferometric signal, giving the information of interest as fringes in the output image. However, for low light intensities, the images might need to be processed to facilitate the visualization and detection of these fringes. In this work we analyze two main approaches to achieve this: one that uses a cross correlation method and the other one that uses a specially designed two-dimensional adaptive filtering technique. Both methods showed an improved performance when compared with conventional image processing techniques, enhancing the fringes contrast. Additionally, we showed that combining normalized cross correlation and the image gradient is an effective method to locate low intensity signals.
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Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Cusato, Leslie Judith; Torga, Jorge Román; Morel, Eneas Nicolas; Enhancing detection of low-coherence interferometry signals acquired with a spatial heterodyne detector; Elsevier Science; Optics Communications; 529; 11-2022; 1-8
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