Abstract
The paper presents a two-color digital holographic interferometer. The set-up is devoted to the study of the fundamental dynamic of unconsolidated materials. Optical configuration and algorithms to recover the optical phase of two-color digitally encoded holograms are described. The method is based on a spatial-color-multiplexing scheme in which holographic reconstruction is performed using adapted wavelength zero-padding and reconstructing distance. Experimental results are presented in the case of granular media excited in the frequency range 400Hz-3000Hz and exhibits the 3D movement.
Highlights
Digital holography became properly available since its confirmation was established in 1994 [1]
The perspective of measurement of 3D vibration motions using digital Fresnel holography could be very important for getting insight in the fundamental dynamics of disordered granular materials
We present an experimental investigation of the 3D motion of granular medium by using a two-color digital holographic interferometer
Summary
Digital holography became properly available since its confirmation was established in 1994 [1]. We present an experimental investigation of the 3D motion of granular medium by using a two-color digital holographic interferometer In order to jump this point and avoid rounding on number of data points, one can chose 1000KR/KG=integer, where integer=1189 or integer=1190, for the considered wavelengths This approximation cannot lead exactly to ∆ηG=∆ηR. The sampling pitches in the image are ∆ηR=λRdR/KRpx and ∆ηG=λGdG/KGpx (a similar relation holds for the y direction), where dR and dG are respectively the reconstructing distance for the R and G holograms.
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