Dynamic measurement of deformation using Fourier transform digital holographic interferometry

Xinya Gao; Sijin Wu; Lianxiang Yang

doi:10.1117/12.2035889

10 October 2013 Dynamic measurement of deformation using Fourier transform digital holographic interferometry

Xinya Gao, Sijin Wu, Lianxiang Yang

Proceedings Volume 8916, Sixth International Symposium on Precision Mechanical Measurements; 891617 (2013) https://doi.org/10.1117/12.2035889
Event: Sixth International Symposium on Precision Mechanical Measurements, 2013, Guiyang, China

Abstract

Digital holographic interferometry (DHI) is a well-established optical technique for measurement of nano-scale deformations. It has become more and more important due to the rapid development of applications in aerospace engineering and biomedicine. Traditionally, phase shift technique is used to quantitatively measure the deformations in DHI. However, it cannot be applied in dynamic measurement. Fourier transform phase extraction method, which can determine the phase distribution from only a single hologram, becomes a promising method to extract transient phases in DHI. This paper introduces a digital holographic interferometric system based on 2D Fourier transform phase extraction method, with which deformations of objects can be measured quickly. In the optical setup, the object beam strikes a CCD via a lens and aperture, and the reference beam is projected on the CCD through a single-mode fiber. A small inclination angle between the diverging reference beam and optical axial is introduced in order to physically separate the Fourier components in frequency domain. Phase maps are then obtained by the utilization of Fourier transform and windowed inverse Fourier transform. The capability of the Fourier transform DHI is discussed by theoretical discussion as well as experiments.

Citation Download Citation

Xinya Gao, Sijin Wu, and Lianxiang Yang "Dynamic measurement of deformation using Fourier transform digital holographic interferometry", Proc. SPIE 8916, Sixth International Symposium on Precision Mechanical Measurements, 891617 (10 October 2013); https://doi.org/10.1117/12.2035889

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