Abstract
We present a miniaturized optical setup using light scattering information of two avalanche photodiodes to measure the size of airborne nanoparticles. To increase the signal, two Fresnel ring lenses are used collecting scattered light in two angle intervals. The laser beam has been shaped to a vertical bar to increase the uniqueness of the detection as described below. Measurements show reasonable signal-to-noise ratios for 90 nm, 150 nm and 300 nm polystyrene latex nanoparticles.
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