Numerical stud of glare spot phase Doppler anemometry

Abstract : The phase Doppler anemometry has (PDA) been developed to measure simultaneously the velocity and the size of droplets. When the concentration of particles is high, tightly focused beams must be used, as in the dual burst PDA. The latter permits an access to the refractive index of the particle, but the effect of wave front curvature of the incident beams becomes evident. In this paper, we introduce a glare spot phase Doppler anemometry which uses two large beams. The images of the particle formed by the reflected and refracted light, known as glare spots, are separated in space. When a particle passes through the probe volume, the two parts in a signal obtained by a detector in forward direction are then separated in time. If two detectors are used the phase differences and the intensity ratios between two signals, the distance between the reflected and refracted spots can be obtained. These measured values provide information about the particle diameter and its refractive index, as well as its two velocity components. This paper is devoted to the numerical study of such a configuration with two theoretical models: geometrical optics and rigorous electromagnetism solution.
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Contributor : Camille Hespel <>
Submitted on : Tuesday, June 21, 2011 - 11:10:44 AM
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Camille Hespel, Kuan Fang Ren, Gérard Gréhan, Fabrice Onofri. Numerical stud of glare spot phase Doppler anemometry. Optics Communications, Elsevier, 2008, pp.1375-1383. ⟨10.1016/j.optcom.2007.11.034⟩. ⟨hal-00601955⟩



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