A simplified algorithm for digital fringe analysis in two-wave interferometry with sinusoidal phase modulation

OPTICS COMMUNICATIONS

卷:391

Article

Dubois, Arnaud¹ 

[1] Univ Paris Saclay, CNRS, Lab Charles Fabry, Inst Opt,Grad Sch, F-91127 Palaiseau, France

关键词: Interferometry;    Phase modulation;    Interference microscopy;    Fringe analysis;   

DOI  :  10.1016/j.optcom.2017.01.004

来源: Elsevier

【 摘 要 】

A compact simplified algorithm for digital detection of the amplitude and phase of the interferometric signal delivered by a two-wave interferometer with sinusoidal phase modulation is presented. The algorithm consists of simple mathematical combinations of four frames obtained by integration by a camera of the time-varying intensity in an interference pattern during the four successive quarters of the modulation period. The algorithm is invariant by circular permutation of the four image frames. Any set of four consecutive frames can be used for the calculations, which simplifies the practical implementation of the method. A numerical simulation has been carried out to evaluate the efficiency of the algorithm for fringe envelope extraction in low-coherence interferometry. A theoretical analysis of the effect of noise in phase map calculation is conducted. A comparison with the conventional sinusoidal phase-shifting algorithm is made.

【 授权许可】

Free