Abstract
A particle monitor is developed for real-time measurement of dust concentration measured in living and working environments. The principle of the device is based on the optical scattering method. An integration sphere is used to collect the light scattered by dust onto a photo-detector (PD). A double-modulated laser system, a low-noise current-to-voltage converter and a synchronous demodulator for averaging are used for the optical source and detector, respectively, to enhance the signal-to-noise ratio (SNR). Individual performances of the optical and signal processing units indicate that a dust concentration lower than 0.2 /spl mu/g/m/sup 3/ is detectable, but the minimum detectable concentration of an assembled prototype monitor is limited to 5 /spl mu/g/m/sup 3/. This may be due to diffracted light and optical misalignment.
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