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Default SODA2 Processing Settings

Linkage scripts within ADPAA pass parameters to the included SODA2 software which determine the particle sizing method and additional sizing corrections, and methods of processing partially captured particles. The default settings and their alternatives are described below.

Methods for Processing Particle Size [method]

default: fastcircle; alternatives: WaterProcessing, xsize, ysize;

fastcircle - the smallest possible circle is fit around a particle image and the circle diameter is used at the particle diameter. A computationally efficient method which helps produce a simple comparison of particle area to the area of a circle or "area ratio".

WaterProcessing - a method of applying "fastcircle" with the addition of a particle size correction based on the size of Poisson spots generated when imaging liquid particles. Poisson spots develop due to particle magnification as a result of improper particle placement within the probe's depth of field. When a Poisson spot is detected the area of the spot is measured and compared to to the total particle area. The resulting ratio produces a correction factor which reduces the measured particle size to that of the actual particle (without Poisson magnification).

xsize - the maximum difference between shaded pixels is measured across the array (the x plane).

ysize - the maximum difference between shaded pixels is measured along the direction of airflow (the y plane).

Methods for processing partially captured particles [processingtype]; default: reconstruction; alternatives: allin, centerin ;