Doppler phase-shifting interferometry and holography

Toyohiko Yatagai; Daisuke Barada

doi:10.1117/12.869401

4 November 2010 Doppler phase-shifting interferometry and holography

Toyohiko Yatagai, Daisuke Barada

Proceedings Volume 7848, Holography, Diffractive Optics, and Applications IV; 784806 (2010) https://doi.org/10.1117/12.869401
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

A new technique is proposed, in which a phase-shifting algorithm utilizing the optical Doppler effect and a high-speed CMOS camera are employed. In many phase-shifting algorithms, the phase distribution of the object is calculated by using a few reference phases with equal phase difference. In our proposed method, a reference mirror is moved continuously or randomly to make phase shift based on the Doppler effect. The phase distribution of the object is calculated by Fourier transforming the time-depending interference fringe data. If the reference phase shift is equally introduced to all the data points in the interference fringe image, the phase distribution at the peak frequency component in the Fourier spectrum gives the phase distribution of the object. Since a few hundred or more images were required in this method, a CMOS camera with a high frame rate of 500fps was used.

Citation Download Citation

Toyohiko Yatagai and Daisuke Barada "Doppler phase-shifting interferometry and holography", Proc. SPIE 7848, Holography, Diffractive Optics, and Applications IV, 784806 (4 November 2010); https://doi.org/10.1117/12.869401

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