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Proceedings Paper

Digital in-line holography in particle measurement
Author(s): Thomas M. Kreis; Mike Adams; Werner P. O. Jueptner
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Paper Abstract

Size, position, and velocity of particles or droplets in 3D- space can be measured contactlessly by in-line holography. In digital in-line holography the holograms are recorded by a CCD-array and stored digitally, the reconstruction of the complex wavefields is performed numerically in the computer. By an arrangement allowing the laser beam to pass several times through the particle field before hitting the CCD, several angular views are recorded simultaneously. In the reconstruction stage the viewed are separated by numerical focusing to the different distances, and by a tomography- related method the 3D-positions of the particles are determined. Double pulse recording enables to determine also the velocity of the particles. The paper gives a short introduction to digital holography, explains several holographic arrangements for multipass in-line holography, presents some experimental results of position and velocity measurements, and discusses some typical errors.

Paper Details

Date Published: 13 August 1999
PDF: 11 pages
Proc. SPIE 3744, Interferometry '99: Techniques and Technologies, (13 August 1999); doi: 10.1117/12.357746
Show Author Affiliations
Thomas M. Kreis, Bremer Institut fuer Angewandte Strahltechnik (Germany)
Mike Adams, Bremer Institut fuer Angewandte Strahltechnik (Germany)
Werner P. O. Jueptner, Bremer Institut fuer Angewandte Strahltechnik (Germany)

Published in SPIE Proceedings Vol. 3744:
Interferometry '99: Techniques and Technologies
Malgorzata Kujawinska; Mitsuo Takeda, Editor(s)

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