Rough object distance measurement and fringe localization using focus measures

Authors

Jae Lord Dexter Filipinas ⋅ PH National Institute of Physics, University of the Philippines Diliman
Percival Almoro ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

A high-resolution technique for distance measurement of rough objects by evaluation of fringe localization using focus measures is demonstrated experimentally. Dual-illumination digital holographic interferometry is used to generate phase difference maps (PDMs) of a rough test object. Focus measure values of the PDMs along the axial direction (increment: 10λ = 6.33 μm) yield an inverted bell-shaped curve which, in turn, facilitates the characterization of the plane and region of fringe localization and, subsequently, the localization of the rough object. The technique can be extended to applications that require fully automated control of fringe visibility.

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Issue

2011: Proceedings of the 29th Samahang Pisika ng Pilipinas National Physics Congress

Article ID

SPP2011-1B-1

Section

Acoustics, Optics, Photonics

Published

2011-10-24

How to Cite

[1]

JLD Filipinas and P Almoro, Rough object distance measurement and fringe localization using focus measures, Proceedings of the Samahang Pisika ng Pilipinas 29, SPP2011-1B-1 (2011). URL: https://proceedings.spp-online.org/article/view/SPP2011-1B-1.