Digital holography of particles: benefits of the ‘inverse problem’ approach

Gire, Jérôme; Denis, Loïc; Fournier, Corinne; Thiébaut, Éric; Soulez, Ferréol; Ducottet, Christophe

doi:10.1088/0957-0233/19/7/074005

Cited by 39 publications

(32 citation statements)

References 39 publications

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“…(1). In this branch, different techniques have emerged for the two decades of existence of digital holography as (i) digital holographic microscopy with a plane wave or a point-source illumination [10,11]; (ii) optical diffraction tomography with multi-directional phase-shifting holographic capture [12]; (iii) infrared holography in the long wavelength region for capture of large objects [13]; (iv) determination of sizes and locations and tracking of particles in a 3D volume [14]. Feature recognition based on digital holography has been proposed [15].…”

Section: D Capture and 3d Content Generation By Digital Holographymentioning

confidence: 99%

3D Capture and 3D Contents Generation for Holographic Imaging

Stoykova¹,

Kang²,

Kim³

et al. 2017

Holographic Materials and Optical Systems

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The intrinsic properties of holograms make 3D holographic imaging the best candidate for a 3D display. The holographic display is an autostereoscopic display which provides highly realistic images with unique perspective for an arbitrary number of viewers, motion parallax both vertically and horizontally, and focusing at different depths. The 3D content generation for this display is carried out by means of digital holography. Digital holography implements the classic holographic principle as a two-step process of wavefront capture in the form of a 2D interference pattern and wavefront reconstruction by applying numerically or optically a reference wave. The chapter follows the two main tendencies in forming the 3D holographic content-direct feeding of optically recorded digital holograms to a holographic display and computer generation of interference fringes from directional, depth and colour information about the 3D objects. The focus is set on important issues that comprise encoding of 3D information for holographic imaging starting from conversion of optically captured holographic data to the display data format, going through different approaches for forming the content for computer generation of holograms from coherently or incoherently captured 3D data and finishing with methods for the accelerated computing of these holograms.

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Section: D Capture and 3d Content Generation By Digital Holographymentioning

confidence: 99%

3D Capture and 3D Contents Generation for Holographic Imaging

Stoykova¹,

Kang²,

Kim³

et al. 2017

Holographic Materials and Optical Systems

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“…The 3D image is thus reconstructed in a sample space (plane by plane) and the object parameters (locations and sizes) are determined by locating the in focus plane of each object. The limitations encountered in doing so have been well identified (Gire et al 2008). The most restrictive are the limited depth accuracy and the limited field of view due to border effects.…”

Section: Optical Setup -Recording Parameters -Calibrationmentioning

confidence: 99%

“…Droplets size evolutions were measured along their 3D trajectories from digital holograms recorded with a high speed camera (3 kHz). The "inverse problems" approach selected to process the holograms is known as the optimal approach in terms of signal processing to reconstruct accurately position and shape of parametric objects such as spherical droplets (Gire et al 2008;Fournier et al 2011). It has been found to work well in this complex flow situation and to provide the accuracy on position and diameters which is required for this type of studies.…”

Section: Introductionmentioning

confidence: 99%

Lagrangian measurements of the fast evaporation of falling diethyl ether droplets using in-line digital holography and a high-speed camera

et al. 2014

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measurements of the fast evaporation of falling diethyl ether droplets using in-line digital holography and a high-speed camera. Experiments in Fluids, Springer Verlag (Germany), 2014, 55, 1708 (13 p.). 10.1007/s00348-014-1708-6. ujm-01020697 Experiments in Fluids manuscript No. (will be inserted by the editor) Lagrangian measurements of the fast evaporation of falling Diethyl Ether droplets using in-line digital holography and a high-speed camera Abstract The evaporation of falling Diethyl Ether droplets is measured by following droplets along their trajectories. Measurements are performed at ambient temperature and pressure by using in-line digital holography. The holograms of droplets are recorded with a single high-speed camera and reconstructed with an "inverse problems" approach algorithm previously tested (Chareyron et al 2012). Once evaporation starts, the interfaces of the droplets are surrounded by air/vapor mixtures with refractive index gradients that modify the holograms. The central part of the droplets holograms is unusually bright compared to what is expected and observed for non-evaporating droplets. The reconstruction process is accordingly adapted to measure the droplets diameter along their trajectory. The Diethyl Ether being volatile, the droplets are found to evaporate in a very short time: of the order of 70 ms for a 50 − 60 µm diameter at an ambient temperature of 25• C. After this time, the Diethyl Ether has fully evaporated and droplets diameter reaches a plateau. The remaining droplets are then only composed of water, originating from the cooling and condensation of the humid air at the droplet surface. This assertion is supported by two pieces of evidence: (i) by estimating the evolution of droplets refractive index from light scattering measurements at rainbow angle, and (ii) by

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“…If the object distribution at the object plane is one dimensional, then substituting (4) in (15) in the far-field condition ξ 2 /λz 1 and applying the method of stationary phase to evaluate the integral, leads to the intensity at the …”

Section: Out-of-focus Plane Approachmentioning

confidence: 99%

Application of digital holography to filament size analysis

Semin¹,

Poelma²,

Drost³

et al. 2010

Meas. Sci. Technol.

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The potential of in-line digital holography to locate and measure the size and position of filaments, i.e. thin wire-like objects, distributed throughout a thick volume has been investigated. In this paper two approaches are introduced to study filaments of varying diameter. (1) It is shown analytically and experimentally that for a gradual variation of filament diameter, one-dimensional Fraunhofer diffraction theory can be applied with an accuracy of 5% to filaments with a diameter of 60-100 μm; the x and z positions of filaments in a bundle can be determined with 0.1 mm and 0.3 mm accuracy respectively. (2) The out-of-focus plane approach has been modified and applied to a simple bundle of filaments for the case when their diffraction patterns can no longer be distinguished individually on the hologram. An accuracy of 20% in measuring diameter and 0.3 mm to detect the position is reported. Limitations as well as suggestions to further improve the technique are discussed.

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Digital holography of particles: benefits of the ‘inverse problem’ approach

Cited by 39 publications

References 39 publications

3D Capture and 3D Contents Generation for Holographic Imaging

3D Capture and 3D Contents Generation for Holographic Imaging

Lagrangian measurements of the fast evaporation of falling diethyl ether droplets using in-line digital holography and a high-speed camera

Application of digital holography to filament size analysis

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