22 February 2018 Light scattering by ultrasonically-controlled small particles: system design, calibration, and measurement results
Author Affiliations +
Proceedings Volume 10539, Photonic Instrumentation Engineering V; 105390R (2018) https://doi.org/10.1117/12.2289079
Event: SPIE OPTO, 2018, San Francisco, California, United States
We present the design of a novel scatterometer for precise measurement of the angular Mueller matrix profile of a mm- to µm-sized sample held in place by sound. The scatterometer comprises a tunable multimode Argon-krypton laser (with possibility to set 1 of the 12 wavelengths in visible range), linear polarizers, a reference photomultiplier tube (PMT) for monitoring the beam intensity, and a micro-PMT module mounted radially towards the sample at an adjustable radius. The measurement angle is controlled by a motor-driven rotation stage with an accuracy of 15’. The system is fully automated using LabVIEW, including the FPGA-based data acquisition and the instrument’s user interface. The calibration protocol ensures accurate measurements by using a control sphere sample (diameter 3 mm, refractive index of 1.5) fixed first on a static holder followed by accurate multi-wavelength measurements of the same sample levitated ultrasonically.

To demonstrate performance of the scatterometer, we conducted detailed measurements of light scattered by a particle derived from the Chelyabinsk meteorite, as well as planetary analogue materials. The measurements are the first of this kind, since they are obtained using controlled spectral angular scattering including linear polarization effects, for arbitrary shaped objects. Thus, our novel approach permits a non-destructive, disturbance-free measurement with control of the orientation and location of the scattering object.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ivan Kassamakov, Ivan Kassamakov, Göran Maconi, Göran Maconi, Antti Penttilä, Antti Penttilä, Petteri Helander, Petteri Helander, Maria Gritsevich, Maria Gritsevich, Tuomas Puranen, Tuomas Puranen, Ari Salmi, Ari Salmi, Edward Hæggström, Edward Hæggström, Karri Muinonen, Karri Muinonen, } "Light scattering by ultrasonically-controlled small particles: system design, calibration, and measurement results", Proc. SPIE 10539, Photonic Instrumentation Engineering V, 105390R (22 February 2018); doi: 10.1117/12.2289079; https://doi.org/10.1117/12.2289079

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