Digital speckle pattern interferometry as a holographic velocimetry technique

Lobera, Julia; Andrés, Nieves; Arroyo, M. P.

doi:10.1088/0957-0233/15/4/015

Cited by 25 publications

(16 citation statements)

References 13 publications

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“…The object phase map can be retrieved from each specklegram using a global Fourier Transform Method (FTM) [14][15] . Two images of the object wave in the aperture plane (real and virtual image) appear on the Fourier plane and their position is related to the carrier frequency introduced by the shifting.…”

Section: Digital Speckle Pattern Interferometrymentioning

confidence: 99%

Investigation of liquid immersed metallic surface corrosion processes using speckle interferometry

et al. 2012

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Digital Speckle Pattern Interferometry is applied to analyze surface corrosion processes in a metal sample immersed in a corrosive solution. This work describes the analysis process and the problems that can appear due to changes in the liquid solution. It has been performed a detailed analysis of the optical measurements to obtain a 2D visualization of the surface changes and an evaluation of the influence of the index refraction changes in the evaluation of the corrosion effects.

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Section: Digital Speckle Pattern Interferometrymentioning

confidence: 99%

Investigation of liquid immersed metallic surface corrosion processes using speckle interferometry

et al. 2012

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“…A Fourier transform method [8] is used to obtain the object phase from each specklegram. A Fourier transform calculation followed by a frequency selection and an inverse Fourier transform calculation produces the complex object wave at the sensor plane.…”

Section: Calculation Of Phase Difference Mapsmentioning

confidence: 99%

Force plate for measuring small animal forces by digital speckle pattern interferometry

et al. 2007

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This paper presents a force plate specially designed for measuring ground reaction forces in small animals. Digital Speckle Pattern Interferometry (DSPI) is used to measure the plate deformation produced by the animal. Elasticity theory is used to obtain force magnitude and application position from the vertical displacement field measured with DSPI. The force plate has been tested with static weights of 5 g and 10 g at various locations on the plate. Some experiments with 20 g body weight transgenic mice are also reported.

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“…Recently, digital holography has started to be used with different optical configurations as a velocimetry technique (Meng et al(2004), Lobera et al (2004) and for particle diagnostics (von Ellenrieder and Soria (2003), Palero et al(2005), Pu et al (2005)). Meng et al (2004) andvon Ellenrieder andSoria (2003) apply in their works the in-line holographic set-up.…”

Section: Introductionmentioning

confidence: 99%

Digital holography for micro-droplet diagnostics

2007

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The performance of two digital holographic techniques (digital in-line holography and Digital Image Plane Holography) is compared in the study of the droplets generated by a micro-dispensing device. This device provides droplets whose diameter can be changed by varying the pressure applied to the reservoir containing the substance to be atomized.Digital in-line holograms of the droplets were recorded at four different pressures (10, 15, 20 and 25 psi). The obtained size distribution is quite similar for the four pressures. Although is true that the mean droplet diameter increases with the pressure, also increases the dispersion in the measured values. While for P= 10 and 15 psi the droplet sizes are quite uniform (mean diameter = 159,63 ± 17.1 µm and 163.24±21.8 µm respectively) for the higher pressures the dispersion is three times bigger. The mean diameter measured for 20 psi is 174.2 ± 56.03 µm and for 25 psi is 155,42 ± 34.4 µm.The droplets generated at pressures of 10 and 20 psi were also analyzed with Digital Image Plane Holography. As expected, we found basically the same results as when in-line holography was applied. The mean diameter increases as the pressures increases and so does the dispersion. In this case the average droplet size is 176.78 ± 21.9 µm and 184.71±40.56 µm for 10 and 20 psi respectively.The results obtained with both techniques agree reasonably well. Digital in-line holography can be a very good option for particle characterization in systems with low particle density and relatively big sizes. The great attractiveness of the in-line holographic set-up is that it requires minimum optical equipment and laser coherence length. On the other hand Digital Image Plane Holography need a slightly complicated optical setup but it can be easily adapted for any droplet size by choosing the appropriated magnification on each case. Also, it can be used when the particle density is high, as individual particles in the illuminated plane can be easily isolated.

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Digital speckle pattern interferometry as a holographic velocimetry technique

Cited by 25 publications

References 13 publications

Investigation of liquid immersed metallic surface corrosion processes using speckle interferometry

Investigation of liquid immersed metallic surface corrosion processes using speckle interferometry

Force plate for measuring small animal forces by digital speckle pattern interferometry

Digital holography for micro-droplet diagnostics

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