3. Single-Image Interferogram Demodulation

  1. Prof. Guillermo H. Kaufmann3,4
  1. Manuel Servin1,
  2. Julio Estrada1 and
  3. Antonio Quiroga2

Published Online: 21 FEB 2011

DOI: 10.1002/9783527633852.ch3

Advances in Speckle Metrology and Related Techniques

Advances in Speckle Metrology and Related Techniques

How to Cite

Servin, M., Estrada, J. and Quiroga, A. (2011) Single-Image Interferogram Demodulation, in Advances in Speckle Metrology and Related Techniques (ed G. H. Kaufmann), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany. doi: 10.1002/9783527633852.ch3

Editor Information

  1. 3

    Instituto de Fisica Rosario, Universidad Nacional de Rosario, Facultad de Ciencias Exactas e Ingeniería, Department of Physics and Centro Internacional Franco Argentino de Ciencias, de la Información y de Sistemas, Rosario, Argentina

  2. 4

    Instituto de Fisica Rosario, Blvd. 27 de Febrero 210 bis, S2000EZP Rosario, Argentina

Author Information

  1. 1

    Centro de Investigaciones en Optica, Loma del Bosque 115, Colonia Lomas del Campestre, 37150 Leon, Mexico

  2. 2

    Universidad Complutense de Madrid, Facultad de Ciencias Fisicas, Departamento de Optica, Cuidad Universitaria, 28040 Madrid, Spain

Publication History

  1. Published Online: 21 FEB 2011
  2. Published Print: 23 FEB 2011

ISBN Information

Print ISBN: 9783527409570

Online ISBN: 9783527633852



  • Fourier spatial demodulating method;
  • fringe orientation;
  • linear spatial phase shifting;
  • local adaptable robust quadrature filters (LARQF);
  • nonlinear spatial phase shifting;
  • regularized phase tracker (RPT);
  • single-image interferogram demodulation


This chapter analyzes several techniques that apply when only a single interferogram image is available for measuring a physical quantity through an interferometric experiment. The Fourier technique, as its name implies, uses the Fourier transform to demodulate the interferometric data. This technique works by manipulating the interferometric data as a whole and is probably the most widely used technique in the chapter. On the other hand, the spatial phase shifting technique uses a small quadrature convolution filter to obtain the demodulated phase from the interferogram. One of the main characteristics of the regularized phase tracker (RPT) method is that the RPT obtains the phase already unwrapped. When using the local adaptable robust quadrature filters (LARQF), it is a necessary phase unwrapping technique after demodulation. The chapter presents a global overview of the applications of the fringe orientation in interferogram processing.

Controlled Vocabulary Terms

demodulation; Fourier transform optics; phase shifting interferometry