AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
A New Method to Measure the Extinction Cross Section Using Digital Holography
MATTHEW BERG, Nava Subedi, Mississippi State Univeristy
Abstract Number: 14 Working Group: Instrumentation and Methods
Abstract This work will present a new technique to measure an aerosol particle’s extinction cross section. The concept relies on digital holography, where the interference pattern of a particle’s scattered and incident light is recorded optoelectronically to yield a digital hologram. Much information about a particle’s physical character can be extracted from such holograms. For example, a silhouette-like image of the particle can be obtained via a simple Fourier-transform-based operation. This talk will show how the digital hologram can also yield the value of the extinction cross section for single and multiple nonspherical particles. Given the simplicity of the measurements involved, such capability could have important applications to quantify extinction by complex-shaped aerosol particles, such as mineral dust, and can do so in situ.