RT Journal Article T1 Regularized quadrature and phase tracking from a single closed-fringe interferogram A1 Quiroga Mellado, Juan Antonio A1 Marroquín Zaleta, José Luis A1 Servín Guirado, Manuel AB A new sequential phase demodulator based on a regularized quadrature and phase tracker system (RAPT) is applied to demodulate two-dimensional fringe patterns. This RQPT system tracks the fringe pattern's quadrature and phase in a sequential way by following the path of the fringes. To make the RAPT system more robust to noise, the modulating phase around a small neighborhood is modeled as a plane and the quadrature of the signal is estimated simultaneously with the fringe's modulating phase. By sequentially calculating the quadrature of the fringe pattern, one obtains a more robust sequential demodulator than was previously possible. This system may be applied to the demodulation of a single interferogram having closed fringes. PB Optical Society of America SN 1084-7529 YR 2004 FD 2004-03 LK https://hdl.handle.net/20.500.14352/50817 UL https://hdl.handle.net/20.500.14352/50817 LA eng NO © 2004 Optical Society of America.M. Servín and J. L. Marroquín were partially supported by grants 33429-E and 42523, respectively, from Consejo Nacional de Ciencia y Tecnología (CONACYT), México. NO Consejo Nacional de Ciencia y Tecnología (CONACYT), México. DS Docta Complutense RD 9 abr 2025