13 August 1999 Digital in-line holography in particle measurement
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Proceedings Volume 3744, Interferometry '99: Techniques and Technologies; (1999) https://doi.org/10.1117/12.357746
Event: International Conference on Optical Metrology, 1999, Pultusk Castle, Poland
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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas M. Kreis, Thomas M. Kreis, Mike Adams, Mike Adams, Werner P. O. Jueptner, Werner P. O. Jueptner, "Digital in-line holography in particle measurement", Proc. SPIE 3744, Interferometry '99: Techniques and Technologies, (13 August 1999); doi: 10.1117/12.357746; https://doi.org/10.1117/12.357746

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