Position measurement of in-line microbid holograms using an autoregressive method

Nadia Saidani; Ali Boukellal; Rabah Mokdad; Pierre Pfeiffer

doi:10.1117/12.2306572

24 May 2018 Position measurement of in-line microbid holograms using an autoregressive method

Nadia Saidani, Ali Boukellal, Rabah Mokdad, Pierre Pfeiffer

Proceedings Volume 10677, Unconventional Optical Imaging; 106773F (2018) https://doi.org/10.1117/12.2306572
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

The work developed and presented in this communication, relates to the restitution of frequency chirp of an interferometric signal deduced from a measured diffraction pattern relating to a spherical micro-particle. For this purpose, analysis were achieved by implementing a parametric method with a sliding window. These frequencies allows us to reconstruct the axial position of the corresponding object. The study, achieved in the far field approximation, allows us to validate preceding methods based on simulation results. The principle consists to generate optically in-line diffraction patterns of a spherical particle with radii of 39μm and measured with a microscope ZEISS. The collimated coherent light was generated from a He-Ne laser that the wavelength is λ = 632.8 nm. The generated diffraction pattern was recorded by using a 2D-CCD camera Ophir having 1024 x768 pixels with a pitch of 4.65 μm connected to a computer. Since the variation of the chirp frequency is linear, the knowledge of its variation slop, resulting from a linear fit, enables us to deduce the z-position of the particle. This is achieved with a resolution of 1.2 %.

Citation Download Citation

Nadia Saidani, Ali Boukellal, Rabah Mokdad, and Pierre Pfeiffer "Position measurement of in-line microbid holograms using an autoregressive method ", Proc. SPIE 10677, Unconventional Optical Imaging, 106773F (24 May 2018); https://doi.org/10.1117/12.2306572

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