Interferometric measurement of diffusion coefficients through a scanning laser beam

Alanís, Elvio; Romero, Gladis Graciela; Martínez, Carlos Córdova

doi:10.1117/1.602422

Cited by 26 publications

(10 citation statements)

References 13 publications

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“…If the ray enters at 0 z and p x x , so that ( , ) p p n x t n , Equation (13) can be integrated, with respect to z, and we…”

Section: Change Of Refractive Index During Diffusion Process and Corrmentioning

confidence: 99%

“…Laser-based techniques are among the most sensitive methods employed for measuring diffusion coefficient and thermal conductivity [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In this paper we propose an improved version of digital projection moiré to study the refractive index variation in liquid mixtures and hence to measure the diffusion coefficient in mass transfer.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of mass diffusion coefficients by digital moiré

2005

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In order to measure small diffusion coefficients of miscible fluids, in this paper we propose an improved version of digital projection moiré. The system uses a simple and flexible fringe generator realized by means of a video projector with a modification of projection optic. The fringe patterns are projected on the bottom of a ground glass plate. The phase object (diffusion cell) is placed in front of the ground glass (in other words, in front of the fringe pattern), which is imaged by a digital video camera. Grating patterns, during the evolution of diffusion phenomena, are captured by a CCD camera and stored in a computer at different times. With the aid of signal demodulating techniques, the images are processed to obtain the diffusion coefficients. The theoretical aspects of the method are presented and the relationship between the fringe shift and the diffusion coefficient is derived. Furthermore, we report some experiments conducted for demonstrating the usefulness of the system.

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“…If the ray enters at 0 z and p x x , so that ( , ) p p n x t n , Equation (13) can be integrated, with respect to z, and we…”

Section: Change Of Refractive Index During Diffusion Process and Corrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of mass diffusion coefficients by digital moiré

2005

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“…There are various methods to study diffusion process and optical method is one among them. The optical method includes conventional interferometry, holographic interferometry and electronic speckle pattern interferometry [3][4][5][6][7][8][9][10][11][12][13] . Holographic interferometric technique is one of the most widely used techniques for diffusivity studies, as it is a whole field technique.…”

Section: Introductionmentioning

confidence: 99%

Diffusion coefficient measurement of transparent liquid solutions using digital holographic interferometry

2005

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A method to measure diffusion coefficient of transparent liquid solutions using digital holographic inteferometry is described. Holograms of a diffusively reflecting object through the experimental cell containing the diffusing solutions are recorded at different time instances. The recording medium is a CCD chip. The holographic interference of the object at two instances of time is numerically carried out in a PC and is used to determine the diffusion coefficient. Holographic interference fringes can be displayed on a PC monitor. The diffusion coefficients calculated using this method matched very well with literature values.

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“…Various physical and chemical methods are employed for experimentally finding the diffusivity with their characteristic advantages and disadvantages [2]. One of the important experimental techniques to find diffusivity is optical interferometric technique [3][4][5]. Though optical techniques using conventional light sources yield good results, the invention of laser drastically increased its efficiency.…”

Section: Introductionmentioning

confidence: 99%