Simultaneous particle size, 3D position and velocity measurements from processing of defocused images recorded with two CCD cameras

Denis Lebrun; Cafer Ozkul; C. E. Touil; J. B. Blaisot; Alain Kleitz

doi:10.1117/12.194333

15 November 1994 Simultaneous particle size, 3D position, and velocity measurements from processing of defocused images recorded with two CCD cameras

Denis Lebrun, Cafer Ozkul, C. E. Touil, J. B. Blaisot, Alain Kleitz

Author Affiliations +

Proceedings Volume 2248, Optical Measurements and Sensors for the Process Industries; (1994) https://doi.org/10.1117/12.194333
Event: Optics for Productivity in Manufacturing, 1994, Frankfurt, Germany

Abstract

Out of focus images recorded separately by two CCD cameras viewing the same object field are processed to measure simultaneously the size, 3-D position, and velocity of particles. The sign ambiguity of defocusing is removed by introducing a shift on the axial location of one camera with respect to the other and by using the ratio of the Fourier transforms of two defocused images. Particle sizing procedure includes mainly a calibration of the point spread function (PSF) of the optoelectronic setup for different amounts of defocusing and the measurement of both the contrast and the width at the intensity mid-point of defocused images.

Citation Download Citation

Denis Lebrun, Cafer Ozkul, C. E. Touil, J. B. Blaisot, and Alain Kleitz "Simultaneous particle size, 3D position, and velocity measurements from processing of defocused images recorded with two CCD cameras", Proc. SPIE 2248, Optical Measurements and Sensors for the Process Industries, (15 November 1994); https://doi.org/10.1117/12.194333

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