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Proceedings Paper

Experimental light scattering by small particles: system design and calibration
Author(s): Göran Maconi; Ivan Kassamakov; Antti Penttilä; Maria Gritsevich; Edward Hæggström; Karri Muinonen
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Paper Abstract

We describe a setup for precise multi-angular measurements of light scattered by mm- to μm-sized samples. We present a calibration procedure that ensures accurate measurements. Calibration is done using a spherical sample (d = 5 mm, n = 1.517) fixed on a static holder. The ultimate goal of the project is to allow accurate multi-wavelength measurements (the full Mueller matrix) of single-particle samples which are levitated ultrasonically.

The system comprises a tunable multimode Argon-krypton laser, with 12 wavelengths ranging from 465 to 676 nm, a linear polarizer, a reference photomultiplier tube (PMT) monitoring beam intensity, and several PMT:s mounted radially towards the sample at an adjustable radius. The current 150 mm radius allows measuring all azimuthal angles except for ±4° around the backward scattering direction. The measurement angle is controlled by a motor-driven rotational stage with an accuracy of 15’.

Paper Details

Date Published: 26 June 2017
PDF: 6 pages
Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103292S (26 June 2017);
Show Author Affiliations
Göran Maconi, Univ. of Helsinki (Finland)
Ivan Kassamakov, Univ. of Helsinki (Finland)
Antti Penttilä, Univ. of Helsinki (Finland)
Maria Gritsevich, Univ. of Helsinki (Finland)
Ural Federal Univ. (Russian Federation)
Edward Hæggström, Univ. of Helsinki (Finland)
Karri Muinonen, Univ. of Helsinki (Finland)
Finnish Geospatial Research Institute (Finland)

Published in SPIE Proceedings Vol. 10329:
Optical Measurement Systems for Industrial Inspection X
Peter Lehmann; Wolfgang Osten; Armando Albertazzi Gonçalves Jr., Editor(s)

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