Evaporating droplet hologram simulation for digital in-line holography setup with divergent beam

Méès, Loïc; Grosjean, Nathalie; Chareyron, Delphine; Marié, Jean-Louis; Seifi, Mozhdeh; Fournier, Corinne

doi:10.1364/josaa.30.002021

Cited by 17 publications

(14 citation statements)

References 18 publications

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“…This self-calibration is simple to apply since it only requires the lensless color microscopy setup. Any spherical object whose diffraction pattern can be described by a direct model (Thompson model [44] for opaque object or (Generalized) Lorenz-Mie model [52,53] for droplets, bubble or beads) can be used. For estimation of laser diode wavelengths, the suggested method makes it possible to accurately estimate two wavelengths based on the value of the third taken as a reference.…”

Section: Resultsmentioning

confidence: 99%

Self-calibration for lensless color microscopy

et al. 2017

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Lensless color microscopy (also called in-line digital color holography) is a recent quantitative 3D imaging method used in several areas including biomedical imaging and microfluidics. By targetting cost effective and compact designs, the wavelength of the low-end sources used is only imprecisely known, in particular because of their temperature and power supply voltage dependence. This imprecision is the source of biases during the reconstruction step. An additional source of error is the crosstalk phenomenon, i.e., the mixture in color sensors of signals originating from different color channels. We propose to use a parametric inverse problem approach to achieve the self-calibration of a digital color holographic setup. This process provides an estimation of the central wavelengths and of the crosstalk. We show that taking the crosstalk phenomenon into account in the reconstruction step improves its accuracy.

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Section: Resultsmentioning

confidence: 99%

Self-calibration for lensless color microscopy

et al. 2017

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“…A wake, attached to the central hologram is also clearly visible. It is caused by the deflection of the light by the refractive index gradient in the thermal -vapor concentration boundary layers and wakes developing around the droplet as discussed in Seifi et al (2013); Méès et al (2013). It was shown that the wake image visualizes well the Lagrangian relative motion of the air around the droplet (Chareyron et al, 2012;Marié et al, 2014).…”

Section: D Reconstructionmentioning

confidence: 99%

Digital holographic measurement of the Lagrangian evaporation rate of droplets dispersing in a homogeneous isotropic turbulence

et al. 2017

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The evaporation rate of diethyl ether droplets dispersing in a homogeneous, nearly isotropic turbulence is measured by following droplets along their trajectory. 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 (3kHz) and droplets trajectories are reconstructed with an "Inverse problem approach" algorithm (IPA) previously used in Chareyron et al (2012); Marié et al (2014). The thermal-vapor concentration wakes developing around the droplets are visible behind each hologram. A standard reconstruction process is applied, showing that these wakes are aligned with the relative Lagrangian velocity seen by droplets at each instant. This relative velocity is that obtained from the dynamic equation of droplets motion and the positions and diameter of the droplets measured by holography and the IPA reconstruction. Sequences of time evolution of droplets 3D positions, diameter, and 3D relative velocity are presented. In a number of cases, the evaporation rate of droplets changes along the trajectory and deviates from the value estimated with a standard film model of evaporation. This shows that turbulence may significantly influence the phase change process.

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“…This is also the technique which was adopted to obtain the data presented in the next subsection. As shown in Méès et al (2013), Seifi et al (2013), the refractive index gradient affects the three central fringes of the holograms. The size of the mask is hence chosen to exclude these fringes.…”

Section: Holograms Of Evaporating Dropletsmentioning

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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Evaporating droplet hologram simulation for digital in-line holography setup with divergent beam

Cited by 17 publications

References 18 publications

Self-calibration for lensless color microscopy

Self-calibration for lensless color microscopy

Digital holographic measurement of the Lagrangian evaporation rate of droplets dispersing in a homogeneous isotropic turbulence

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

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