RT Journal Article
T1 Temporal demodulation of fringe patterns with sensitivity change
A1 Quiroga Mellado, Juan Antonio
A1 Gómez Pedrero, José Antonio
A1 Terrón López, M. José
A1 Servín Guirado, Manuel
AB There are many phase measuring experimental setups in which the rate of temporal phase variation cannot be easily determined. In the case of phase stepping techniques, asynchronous phase measuring techniques were developed to solve this problem. However, there are situations for which the standard asynchronous techniques are not appropriated, like experiments with a sensitivity variation in the phase. In this work, we present an asynchronous demodulation technique for which the only requirement is the monotonicity of the phase in time. The proposed method is based in the computation of the quadrature sign (QS) of the fringe pattern and afterwards the demodulation is performed by a simple arccos calculation, that thanks to the QS extends its range from half fringe to a modulo 2π calculation. The presented demodulation method is asynchronous, direct, fast and can be applied to a general n-dimensional case. We have applied the proposed method to a load stepping experimental fringe pattern obtaining good results.
PB Elsevier Science BV
SN 0030-4018
YR 2005
FD 2005-09-15
LK https://hdl.handle.net/20.500.14352/50807
UL https://hdl.handle.net/20.500.14352/50807
LA eng
NO © 2005 Elsevier B. V.We acknowledge the interesting anonymous referees comments and the partial support for therealization of this work to the Ministerio de Ciencia y Tecnología (Spain), under project DPI2002-02104.
NO Ministerio de Ciencia y Tecnología (Spain)
DS Docta Complutense
RD 8 abr 2025