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19 October 2012 Design and implementation of an imaging nephelometer
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Measurement of the concentration and size of suspended aerosol particles can be useful for a variety of applications. Scanning nephelometers are frequently employed in such measurement; however, their methodology requires long measurement times and places limitations on scattering angle. We have developed a non-scanning laser polar nephelometer that allows for near-instantaneous measurement and greater angular range. This instrument uses both refractive and reflective components to image light scattered from a volume of scattering particles onto an imaging sensor, while allowing for introduction of a polarization analyzer. The scattering volume itself is imaged in the center of the sensor, whereas the light scattered at various angles is imaged about the sensor. Angles from one hemisphere are imaged, with an angular resolution of better than one degree. Preliminary data from suspended water droplets match closely those quoted in the literature, with data collected from angles closer to forward- and back-scattered angles. Design requirements; the optical design and implementation; and preliminary data and analysis are presented.
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Daniel K. Frayer and Michael Taylor "Design and implementation of an imaging nephelometer", Proc. SPIE 8487, Novel Optical Systems Design and Optimization XV, 848702 (19 October 2012);

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