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Thermophysics and Aeromechanics

2011 year, number 1

Interferometric technique for measurement of droplet diameter

A.V. Bilsky1, YU.A. Lozhkin1, D.M. Markovich2
1 Kutateladze Institute of Thermophysics SB RAS
2 Kutateladze Institute of Thermophysics SB RAS; Novosibirsk State University
Keywords: droplet diameter, interferometer, laser, gas-droplet flow, IPI
Pages: 1-12


The paper considers the optical contact-free method of droplet diameter sizing in the flow cross-section utilizing light interference on a droplet. Distribution of light scattered by a particle was analyzed for different configurations of the measurement system using the Mie theory and approximation of geometrical optics. Basic measurement errors and dynamic range were determined. Possibility of measurements with camera mounting at the angle of 90º to the plane of a laser sheet is shown; this simplifies setup calibration and evens characteristics over the image field. The procedure of measurement system calibration and a set of algorithms for data processing are suggested. The suggested approaches were applied for measurement of characteristics of the gas-droplet jet.