Color Transmission and Reflection Holographic Interferometry Applied to Fluids Mechanics

Desse, Jean-Michel; Albe, F.; Tribillon, J. L.

doi:10.1166/jhs.2009.010

Cited by 2 publications

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“…A comparison can be made with the results obtained with threewavelength holographic interferometry using panchromatic plates and detailed in Desse [2,3]. For that, we have to compute on each plane RGB the luminous intensity of interference fringes from the phase map according to the following expression:…”

Section: Comparison With Color Holographic Interferometry Using Panch...mentioning

confidence: 99%

“…That is why ONERA has devoted much time to developing optical methods based on differential or color interferometry. ONERA has developed optical benches based on real-time color transmission and reflection holographic interferometry [1][2][3], well suited when high spatial resolution is required. In these studies, the interest of using three different wavelengths as a luminous light source has been demonstrated because the diagram of interference fringes exhibits a unique white fringe which directly visualizes the zero order of interference fringes.…”

Section: Introductionmentioning

confidence: 99%

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Sensor influence in digital 3λ holographic interferometry

Desse

Picart

Tankam

2011

Meas. Sci. Technol.

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In digital holographic interferometry, the resolution of the reconstructed hologram depends on the pixel size and pixel number of the sensor used for recording. When different wavelengths are simultaneously used as a luminous source for the interferometer, the shape and the overlapping of three filters of a color sensor strongly influence the three reconstructed images. This problem can be directly visualized in 2D Fourier planes on red, green and blue channels. To better understand this problem and to avoid parasitic images generated at the reconstruction, three different sensors have been tested: a CCD sensor equipped with a Bayer filter, a Foveon sensor and a 3CCD sensor. The first one is a Bayer mosaic where one half of the pixels detect the green color and only one-quarter detect the red or blue color. As the missing data are interpolated among color detection positions, offsets and artifacts are generated. The second one is a specific sensor constituted with three stacked photodiode layers. Its technology is different from that of the classical color mosaic sensor because each pixel location detects the three colors simultaneously. So, the three colors are recorded simultaneously with identical spatial resolution, which corresponds to the spatial resolution of the sensor. However, the spectral curve of the sensor is large along each wavelength since the color segmentation is based on the penetration depth of the photons in silicon. Finally, with a 3CCD sensor, each image is recorded on three different sensors with the same resolution. In order to test the sensor influence, we have developed a specific optical bench which allows the near wake flow around a circular cylinder at Mach 0.45 to be characterized. Finally, best results have been obtained with the 3CDD sensor.

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Section: Comparison With Color Holographic Interferometry Using Panch...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sensor influence in digital 3λ holographic interferometry

Desse

Picart

Tankam

2011

Meas. Sci. Technol.

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Digital three-color holographic interferometry for flow analysis

Desse¹,

Picart²,

Tankam³

2008

Opt. Express

110

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A digital three-color holographic interferometer was designed to analyze the variations in refractive index induced by a candle flame. Color holograms are generated and recorded with a three layer photodiode stack sensor allowing a simultaneous recording with a high spatial resolution. Phase maps are calculated using Fourier transform and spectral filtering is applied to eliminate parasitic diffraction orders. Then, the contribution along each color is obtained with the simultaneous three wavelength measurement. Results in the case of the candle flame are presented. Zero order fringe, meaning zero optical path difference, can be easily extracted from the experimental data, either by considering a modeled colored fringe pattern or the wrapped phases along the three wavelengths.

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Color Transmission and Reflection Holographic Interferometry Applied to Fluids Mechanics

Cited by 2 publications

References 0 publications

Sensor influence in digital 3λ holographic interferometry

Sensor influence in digital 3λ holographic interferometry

Digital three-color holographic interferometry for flow analysis

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