September 12, 2022
Email office@phys.ksu.edu for the Zoom address
Light-scattering techniques are commonly used to characterize micron and submicron particulate matter, such as aerosols, in a rapid and contact-free way. A typical objective is to infer the size and shape of particles from their light-scattering patterns. While this approach can be useful for simple shapes, difficulties arise for large irregularly shaped particles. An alternative well-suited for large particles is digital holography. Here, a particle is illuminated by a beam and the interference pattern produced by unscattered and scattered light is recorded on a sensor. The pattern is the hologram, and from it, an image of the particle can be unambiguously reconstructed. We have applied this method to a variety of large aerosols particles, in both the laboratory and the outdoor environment with a drone-based instrument. The talk will give an overview of our work in this area and describe how we are advancing the capabilities of digital holography in our ongoing research.