A multi wavelength optical sensing technique has been tested for monitoring a smoke or aerosol polydispersion so as to allow positive discrimination between types of aerosols or particles. It uses a polychromatic LED and spectral analysis in real‐time via the technique of chromatic modulation which allows a three‐parameter description to characterise spectral interactions due to scattering.
Aspey, R.A., Brazier, K.J. and Spencer, J.W. (2004), "Optical sensing of smoke using a polychromatic LED: combustion material identification using HLS analysis", Sensor Review, Vol. 24 No. 2, pp. 199-205. https://doi.org/10.1108/02602280410525986
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