Journal ArticleDOI
Evaluation of surface acoustic waves on the human skin using quasi-time-averaged digital Fresnel holograms
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TLDR
A first attempt to visualize and analyze the vibrations induced by a bone-conduction device and propagating at the surface of the skin of a human face using a sequence of digital Fresnel holograms recorded with a high image rate is proposed.Abstract:
This paper proposes a first attempt to visualize and analyze the vibrations induced by a bone-conduction device and propagating at the surface of the skin of a human face. The method is based on a new approach in a so-called quasi-time-averaging regime, resulting in the retrieval of the vibration amplitude and phase from a sequence of digital Fresnel holograms recorded with a high image rate. The design of the algorithm depends on the ratio between the exposure time and the vibration period. The results show the propagation of vibrations at the skin surface, and quantitative analysis is achieved by the proposed approach.read more
Citations
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Journal Article
Interferometric hologram evaluation and real-time vibration analysis of diffuse objects
Karl A. Stetson,Robert L Powell +1 more
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Multi-point vibrometer based on high-speed digital in-line holography
TL;DR: Experimental results confirm the ability of the digital holographic setup based on in-line holography and a high-speed recording to get a multipoint vibrometer to provide full-field contactless measurements at the high- speed time scale evolution of the vibration.
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Visualization of travelling waves propagating in a plate equipped with 2D ABH using wide-field holographic vibrometry
Laure Lagny,Mathieu Secail-Geraud,Mathieu Secail-Geraud,Julien Le Meur,Silvio Montresor,Kevin Heggarty,Charles Pezerat,Charles Pezerat,Pascal Picart,Pascal Picart +9 more
TL;DR: In this paper, a method for wide-field vibrometry based on high-speed digital holographic interferometry is presented for measuring transient vibrations of structures at 100 kHz frame rate when providing 46600 quantitative data on 380 cm2 rectangular spot at the object surface.
Journal ArticleDOI
Stochastic digital holography for visualizing inside strongly refracting transparent objects
Jean-Michel Desse,Pascal Picart +1 more
TL;DR: A digital holographic method to visualize and measure refractive index variations, convection currents, or thermal gradients, occurring inside a transparent and refracting object is presented, validating the proposed approach.
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High-speed holographic metrology: principle, limitations, and application to vibroacoustics of structures
Julien Poittevin,François Gautier,François Gautier,Charles Pezerat,Charles Pezerat,Pascal Picart,Pascal Picart +6 more
TL;DR: In this article, the basics of high-speed holographic metrology, its limitations, and its application to the investigation of traveling acoustic waves propagating in mechanical structures are described.
References
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Journal ArticleDOI
Direct recording of holograms by a CCD target and numerical reconstruction.
Ulf Schnars,W. Jüptner +1 more
TL;DR: The principle of recording holograms directly on a CCD target is described and a real image of the object is reconstructed from the digitally sampled hologram by means of numerical methods.
Journal ArticleDOI
Interferometric Vibration Analysis by Wavefront Reconstruction
Robert L Powell,Karl A. Stetson +1 more
TL;DR: In this paper, a study of the Leith-Upatnieks hologram for the time average of the coherent wavefronts scattered from a vibrating object is reported, and the image reconstructed by the hologram is found to contain a system of interference fringes which map contours of constant vibration amplitude, thus providing a method of analyzing the vibration of objects with arbitrary surfaces.
Journal ArticleDOI
Generalized Data Reduction For Heterodyne Interferometry
TL;DR: A generalized algorithm for use with digital heterodyne or fringe- scanning interferometers was developed that removes many of the restrictions that had previously applied to the data collection scheme.
Book
Holographic Interferometry: Principles and Methods
TL;DR: In this article, the Fourier transform diffraction theory computer-aided tomography Bessel functions are used to evaluate interference phase processing of the interference phase speckle metrology.
Proceedings ArticleDOI
Methods of digital holography: a comparison
TL;DR: In this paper, the authors used the Fourier transform to calculate the impulse response of free space propagation, which is then Fourier transformed or the free space transfer function is defined immediately.
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