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Single particle laser light scattering analyzer: Simulated performance

Technical Report:

Abstract

This paper presents a laser light scattering apparatus which measures the physical characteristics of a filter testing aerosol in its actual flow by analyzing simultaneously the intensity of the light scattered at different angles by each particle passing through an optically defined scattering volume. Both size and refractive index may be obtained provided that the incoming light flux is kept constant, within 15%, inside the scattering volume. The complete simulation of the optical apparatus was performed by supposing that only one particle at a time is analyzed and that the particles are spherical, thus allowing the Mie theory to model their scattering behaviour. Particle size, complex refractive index (real and imaginary part), and light flux incident onto the particle were considered as the four variables. Preliminary trial runs, performed with the aim of determining the minimum number of collecting angles necessary to obtain the convergence of fitting procedure to the expected values of the unknown parameters, showed that this convergence could be only occasionally obtained even if up to 10 collecting angles had been adopted. This occurrence demonstrated the existence of a strong correlation between the four parameters. Subsequent runs performed for non-conductive materials gave, on the contrary, better results.
Publication Date:
Jun 01, 1991
Product Type:
Technical Report
Report Number:
ENEA-RT-AMB-90-47; RT/AMB-90-47
Reference Number:
SCA: 440600; PA: ITAN-91:002093; SN: 92000621831
Resource Relation:
Other Information: PBD: Jun 1991
Subject:
47 OTHER INSTRUMENTATION; AEROSOLS; LIGHT SCATTERING; PARTICLE SIZE; REFRACTIVITY; OPTICAL SPECTROMETERS; LASERS; FLOW MODELS; PARAMETRIC ANALYSIS; SIMULATION; PERFORMANCE TESTING; VALIDATION; 440600; OPTICAL INSTRUMENTATION
OSTI ID:
10106884
Research Organizations:
ENEA, Casaccia (Italy). Area Energia Ambiente e Salute; Rome Univ. (Italy). Dipt. di Fisica
Country of Origin:
Italy
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1120-5555; Other: ON: DE92744022; TRN: 91:002093
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
ITAN
Size:
14 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Neri, E, Mazzacurati, V, and Platini, M. Single particle laser light scattering analyzer: Simulated performance. Italy: N. p., 1991. Web.
Neri, E, Mazzacurati, V, & Platini, M. Single particle laser light scattering analyzer: Simulated performance. Italy.
Neri, E, Mazzacurati, V, and Platini, M. 1991. "Single particle laser light scattering analyzer: Simulated performance." Italy.
@misc{etde_10106884,
title = {Single particle laser light scattering analyzer: Simulated performance}
author = {Neri, E, Mazzacurati, V, and Platini, M}
abstractNote = {This paper presents a laser light scattering apparatus which measures the physical characteristics of a filter testing aerosol in its actual flow by analyzing simultaneously the intensity of the light scattered at different angles by each particle passing through an optically defined scattering volume. Both size and refractive index may be obtained provided that the incoming light flux is kept constant, within 15%, inside the scattering volume. The complete simulation of the optical apparatus was performed by supposing that only one particle at a time is analyzed and that the particles are spherical, thus allowing the Mie theory to model their scattering behaviour. Particle size, complex refractive index (real and imaginary part), and light flux incident onto the particle were considered as the four variables. Preliminary trial runs, performed with the aim of determining the minimum number of collecting angles necessary to obtain the convergence of fitting procedure to the expected values of the unknown parameters, showed that this convergence could be only occasionally obtained even if up to 10 collecting angles had been adopted. This occurrence demonstrated the existence of a strong correlation between the four parameters. Subsequent runs performed for non-conductive materials gave, on the contrary, better results.}
place = {Italy}
year = {1991}
month = {Jun}
}