A high-speed particle phase discriminator (PPD-HS) for the classification of airborne particles, as tested in a continuous flow diffusion chamber

A new instrument, the High-speed Particle Phase Discriminator (PPD-HS), developed at the University of Hertfordshire, for sizing individual cloud hydrometeors and determining their phase is described herein. PPD-HS performs an in situ analysis of the spatial intensity distribution of near-forward sc...

Full description

Saved in:
Bibliographic Details
Published in:Atmospheric measurement techniques 2019-06, Vol.12 (6), p.3183-3208
Main Authors: Mahrt, Fabian, Wieder, Jörg, Dietlicher, Remo, Smith, Helen R, Stopford, Chris, Kanji, Zamin A
Format: Article
Language:English
Subjects:
Aerosol effects
Aerosols
Analysis
Atmospheric composition
Atmospheric water
Classification
Climate effects
Cloud droplets
Cloud particles
Clouds
Clouds (Meteorology)
Colleges & universities
Computer simulation
Continuous flow
Crystals
Detection
Detection equipment
Diffusion
Diffusion chambers
Diffusion rate
Future climates
High speed
Hydrometeors
Ice
Ice crystals
Ice nucleation
Indicators
Instruments
Laboratories
Laboratory experiments
Learning algorithms
Light
Luminous intensity
Machine learning
Measurement
Nucleation
Orifices
Particle shape
Properties
Scattering
Shape
Spatial analysis
Symmetry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A new instrument, the High-speed Particle Phase Discriminator (PPD-HS), developed at the University of Hertfordshire, for sizing individual cloud hydrometeors and determining their phase is described herein. PPD-HS performs an in situ analysis of the spatial intensity distribution of near-forward scattered light for individual hydrometeors yielding shape properties. Discrimination of spherical and aspherical particles is based on an analysis of the symmetry of the recorded scattering patterns. Scattering patterns are collected onto two linear detector arrays, reducing the complete 2-D scattering pattern to scattered light intensities captured onto two linear, one-dimensional strips of light sensitive pixels. Using this reduced scattering information, we calculate symmetry indicators that are used for particle shape and ultimately phase analysis. This reduction of information allows for detection rates of a few hundred particles per second.
ISSN:1867-8548
1867-1381
1867-8548
DOI:10.5194/amt-12-3183-2019