Measurement of the Mass Specific Extinction Coefficient of Acetylene, Toluene and Polymethyl Methacrylate Soot Particles in Visible and Near-Infrared Wavelengths

Abstract

An experimental set-up has been developed to determine the mass specific σ s and the dimensionless extinction K t coefficients of soot particles at visible (632 nm) and near-infrared (1064 nm) wavelengths. Near-infrared measurements have been carried out with a multiple-path extinction cell to increase the measurement accuracy. The extinction coefficient K ext has been analysed as a function of the mass concentration, measured by a Tapered Element Oscillating Microbalance (TEOM 1105 R&P) in order to retrieve the soot mass specific extinction coefficient, σ e , in the smoke plume of acetylene, toluene and PolyMethyl MethAcrylate (PMMA) burning under turbulent, well-ventilated and small-scale conditions.

Mie Sensing with Neural Networks: Recognition of Nano‐Object Parameters, the Invisibility Point, and Restricted Models

“…Mie measurements in air have important applications in the aerosol and atmospheric sciences, allowing, for example, to sense industrial and biorelated pollutants in terms of mass extinction coefficients. [63] Another application, concerns we envision is solution-based photocatalysis, in which both absorptive and photochemical cross-sections of nanoparticles are involved. [64] Overall, our study develops the ANN-based methods of detection and testing for single optical nano-objects and their mixtures, formulating both computational and physical limitations; one of such limitations concerns the invisibility-point regime.…”