Two-dimensional small-angle scattering from single particles in infrared with a lensless technique
Abstract
An experiment is described where two-dimensional small-angle light scattering (2D-SALS) patterns from single particles are measured in the infrared through a lens-free approach. Spatial filtering is employed to separate scattered light from unscattered light to within approximately one degree from the forward direction. Non-planar reflective elements are used in the filtering process, permitting 2D-SALS measurements to be done without chromatic aberrations over a broad spectral range and from 0.8 to 8 degrees in the polar scattering angle and zero to 360 degrees in the azimuthal angle. Patterns from spherical microparticles are presented along with nonspherical particles including volcanic ash and salt. An asymmetry analysis is applied to demonstrate an ability to differentiate spherical from nonspherical particles from the 2D-SALS patterns.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 11, 2020
- Source ID
- 10.1364/oe.397699
Entities
People
- Edmundo Reynoso-lara
- Frédéric Fossard
- Killian Aleau
- Lucas Paulien
- Matthew J. Berg
- Romain Ceolato
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- Office National d'Études et de Recherches Aérospatiales