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26 June 2017 Experimental light scattering by small particles: system design and calibration
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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’.
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Göran Maconi, Ivan Kassamakov, Antti Penttilä, Maria Gritsevich, Edward Hæggström, and Karri Muinonen "Experimental light scattering by small particles: system design and calibration", Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103292S (26 June 2017);

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