A Refractive-Index and Position-Independent Single-Particle Detector for Large, Non-Absorbing, Spherical Particles

Waez, Mir Seliman; Eckels, Steven J.; Sorensen, Christopher M.

doi:10.1080/02786826.2018.1524133

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A Refractive-Index and Position-Independent Single-Particle Detector for Large, Non-Absorbing, Spherical Particles

Waez, Mir Seliman; Eckels, Steven J.; Sorensen, Christopher M.

We show that for spherical particles with real refractive index and diameters greater than ca. 10 microns, the differential scattering cross-section is only independent of the refractive index at angles near 37 ± 5°. We built a device with a modified Gaussian incident beam profile so that the beam transit time of a particle passing through the beam can determine the true incident intensity for the scattering of the particle. By combining the modified Gaussian incident beam profile with detection of scattered light near 37 ± 5°, we demonstrate a refractive-index independent measurement of single spherical particles as they pass through the beam.

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Citation: Mir Seliman Waez, Steve J. Eckels & Christopher M. Sorensen (2018) A refractive-index and position-independent single-particle detector for large, nonabsorbing, spherical particles, Aerosol Science and Technology, DOI: 10.1080/02786826.2018.1524133

Journal: Aerosol Science and Technology, Volume: 52, Issue: 11,

Date: 2018

Publisher URL: https://doi.org/10.1080/02786826.2018.1524133

Record URL: http://hdl.handle.net/2097/39386

Rights: This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

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