Phase interferometric particle imaging for simultaneous measurements of evaporating micron-sized droplet and nanoscale size changes

Yingchun Wu (1) , Haipeng Li (2) , Marc Brunel (3) , Jia Chen (1) , Gérard Gréhan (3) , Lutz Mädler (2)

1 TUM - Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne]
2 University of Bremen
3 CORIA - Complexe de recherche interprofessionnel en aérothermochimie

We have developed phase interferometric particle imaging (PHIPI) of Mie scattering to simultaneously measure the spherical and transparent droplet size at the micron scale and transient size changes at the nanoscale. The theoretical derivation of PHIPI reveals that the phase of interferometric fringes between direct transmission and reflection linearly shifts with the change in droplet size. After a proof-of-concept validation with simulation, a PHIPI system is then implemented with an elaborately designed Fourier imaging system and applied to measure single evaporating droplets of ethanol and n-Nonane. The results show that the PHIPI technique can determine the size change down to several nanometers, providing a powerful tool for accurate in-situ characterization of droplet dynamics, e.g., droplet evaporation and oscillation.

Domains: Engineering Sciences [physics]; Optics / Photonic

Yingchun Wu, Haipeng Li, Marc Brunel, Jia Chen, Gérard Gréhan, et al.. Phase interferometric particle imaging for simultaneous measurements of evaporating micron-sized droplet and nanoscale size changes. Applied Physics Letters, 2017, 111 (4), ⟨10.1063/1.4996363⟩. ⟨hal-01861530⟩