Self-generated off-axis holography in interferometric out-of-focus imaging of ice particles

TL;DR

This paper introduces a method for interferometric out-of-focus imaging of ice particles, enabling precise size, shape, and 3D structure determination of the largest particles through off-axis holography analysis.

Contribution

It presents a novel approach combining out-of-focus imaging and off-axis holography to analyze ice particles and reconstruct their 3D structure.

Findings

Accurate size and shape measurement of ice particles.

3D reconstruction of the largest ice particle.

Effective analysis of overlapping defocused images.

Abstract

Interferometric out-of-focus imaging of ice particles is realized. The overlapping defocused images of two nearby ice particles are analyzed. If one particle is much smaller than the other one, the pattern constitutes an off-axis hologram whose analysis gives the exact size and shape of the biggest particle. Using two angles of view, we obtain a 3D description of the biggest ice particle.