Some effects of the sensitivity threshold and spatial resolution of a particle imaging system on the shape of the measured particle size distribution

David K. Costello; Weilin Hou; Kendall L. Carder

doi:10.1117/12.190124

26 October 1994 Some effects of the sensitivity threshold and spatial resolution of a particle imaging system on the shape of the measured particle size distribution

David K. Costello, Weilin Hou, Kendall L. Carder

Author Affiliations +

Proceedings Volume 2258, Ocean Optics XII; (1994) https://doi.org/10.1117/12.190124
Event: Ocean Optics XII, 1994, Bergen, Norway

Abstract

Particle volume spectra are often inferred from optically measured particle areal size distributions after the areal size distributions have been transformed into equivalent spherical diameter (ESD) distributions. Resolution and sensitivity differences between imaging systems result in different shapes for the measured particle size distribution. Additionally, the sensitivity threshold of the imaging system is not only fundamental to the determination of the particle edge but also determines the optical density level below which material will not be imaged. All this affects the measured size of a particle. This contribution utilizes laboratory data and unique, synchronous, ocean field data collected by three coincident imaging systems to evaluate these effects in the study of large marine particles. An algorithm rooted in the theory of moment invariants is presented which avoids the distortions to the particle size distributions when the size of non-spherical and/or porous particles are presented as ESD.

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David K. Costello, Weilin Hou, and Kendall L. Carder "Some effects of the sensitivity threshold and spatial resolution of a particle imaging system on the shape of the measured particle size distribution", Proc. SPIE 2258, Ocean Optics XII, (26 October 1994); https://doi.org/10.1117/12.190124

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