Dual system increases the resolution of a low coherence interferometer system through a signal detector astigmatic focus
A. E. N. Morel, A. D. Aguilar, J. R. Torga
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Base Information
Volume
V48 - N4 / 2015 Ordinario
Reference
301-308
DOI
http://dx.doi.org/10.7149/OPA.48.4.301
Language
Spanish
Keywords
OCT, low coherence interferometry, focus signal, displacement measurement and tomography
Abstract
The low coherence interferometry in Fourier space (FD-OCT) is a technique to measure distance with typical values of dynamic range in the order of 3 mm and resolution below 10 microns. In this paper we propose to combine the interferometric technique with a technique that measures distances using astigmatic focus signal, allowing lead the resolution limit of less than 10 nm. The experimental scheme shown armed with both techniques and experimental results in displacement of a sample surface, controlled feedback system with a piezoelectric strain gauge which we have used as a reference system.
References
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