Construction of a multidetector array incorporated laser-based scattering system for ultrafine TiO2 characterization

Abstract

A laser based light scattering system has been designed and fabricated for measuring the scattering properties of ultrafine TiO 2 particles as a function of scattering angle at the He-Ne laser wavelength 632.8 nm. The system essentially consists of an array of 16 highly sensitive static Si detectors (BPW34) which can measure scattered light signals from 10 degrees to 170 degrees in steps of 1 degree. The signals are interfaced to a high gain 16 channel preamplifier and a dedicated data acquisition system (Vinytics PCI-9812) for data analysis. The measured scattering properties of rutile (TiO 2 ) particles agree reasonably well with the theoretical results drawn from T-matrix calculations.

Comprehensive T-matrix reference database: A 2012–2013 update

“…[ [28][29][30]37,61,[64][65][66]91,94,119,[167][168][169]178,243]. [4][5][6]8,9,34,35,38,56,62,63,67,86,132,171,173,174,193,200,201,226,227,246].…”

Mie scattering computation of spherical particles with very large size parameters using an improved program with variable speed and accuracy

“…During the light scattering process, the intensity and polarization of the incident light is changed due to the interaction with a scatterer. The Stokes vector describing the incident and the scattered light are connected by a 4 Â 4 scattering matrix, S ij , where i, j ¼ 1 to 4, as given below [15,32],…”

“…In fact it is the first well known theoretical framework to explain scattering and extinction of light by small spherical particles embedded in homogenous environments [1,2,[29][30][31][32]42]. Because of the simplicity, accuracy and efficiency of Mie theory, it is still extensively used by many researchers across the globe to develop more accurate and approximate analytical solutions and calibrate new scattering instruments [1][2][3][4][5][40][41][42].…”