3D-reconstructions for the estimation of ice particle’s volume using a two-views interferometric out-of-focus imaging set-up

Marc Brunel (1) , Barbara Delestre (1) , M. Talbi (1)

1 CORIA - Complexe de recherche interprofessionnel en aérothermochimie

The characterization of ice crystals has important applications in airborne research and civil aviation. Interferometric out-of-focus imaging is a promising technique. We investigate in this study the impact of the 3D shape reconstruction of the particles from a pair of interferometric images on the estimation of the ice particle’s volume. An interferometric image gives indeed the 2D autocorrelation of the particle’s shape. As different shapes can exhibit a similar 2D autocorrelation, particles of different shapes can have similar interferometric images. In this study, the volume of ice particles is estimated from a pair of interferometric images (with two perpendicular angles of view). The relative error in the particle’s volume estimation is shown to be around ΔV /V≈30% depending on the choice of the initial 3D particle’s shape. It appears that the choice of the shape of the particle for both angles of view has a lower impact on the estimation of the particle’s volume than the other sources of errors due to image acquisitions themselves.

Domaines: Optique / photonique

Marc Brunel, Barbara Delestre, M. Talbi. 3D-reconstructions for the estimation of ice particle’s volume using a two-views interferometric out-of-focus imaging set-up. Review of Scientific Instruments, 2019, 90 (5), pp.053109. ⟨10.1063/1.5085279⟩. ⟨hal-02145572⟩