Two-step phase demodulation algorithm based on quadratic phase parameter estimation using state space analysis

We propose a noise robust two-step phase shifting algorithm for the evaluation of random and unknown phase step. In this algorithm, the phase within a small size two-dimensional window around a user selected pixel in an interferogram is approximated as a quadratic surface. The problem of quadratic phase fitting parameter estimation is formulated as a state space analysis performed using the extended Kalman filter. The phase step is evaluated from the estimated parameters and subsequently the interferogram phase distribution is obtained. Simulation and experimental results are demonstrated.


Published in:
Optics And Lasers In Engineering, 110, 41-46
Year:
Nov 01 2018
Publisher:
Oxford, ELSEVIER SCI LTD
ISSN:
0143-8166
1873-0302
Keywords:
Laboratories:




 Record created 2018-12-13, last modified 2019-06-19


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