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Particle Measurement Volume and Light Intensity in a Shadowgraph Imaging System

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Publication Details

Author list: Rydblom, Staffan

Publisher: IEEE

Publication year: 2018

ISBN: 978-1-5386-6628-9

DOI: http://dx.doi.org/10.1109/IST.2018.8577170

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Abstract

A method is sought to find the measurement volume of an optical instrument for particle measurement is sought. The study shows that the measurement volume depends on a combination of the optical homogeneity of the illumination light and the camera system. The result from a mix of illumination cases and positions shows that, if the true size and the background brightness are known, the measurement volume can be determined with an average precision of four percent using adual term exponential fit. Using a lens with lower magnification increases the measurement volume since both the field of viewand the depth of field increase. However, a larger field of view increases the required amount of light as well as the sensitivity to other optical errors.


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