Journal
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Volume 71, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2022.3147333
Keywords
Droplet; holography; ice crystal; interferometric; particle imaging (IPI); shape; size
Funding
- National Natural Science Foundation of China [52006193]
- Zhejiang Provincial Natural Science Foundation of China [LQ19E060010]
- National Science and Technology Major Project [2017-V-0016-0069]
- Open Fund of Key Laboratory of Icing and Anti/DeIcing [AIADL20190103]
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Researchers propose a method combining digital inline holography (DIH) and interferometric particle imaging (IPI) techniques to discriminate water droplets and ice crystals and measure their sizes and shapes. The method uses a color camera to simultaneously record the DIH and IPI signals of the same droplet/crystal. The experimental results show that the proposed method is effective in discriminating water droplets and ice crystals.
The discrimination and measurement of complex particle field mixing spherical liquid droplets and other solid irregular particles are challenging but of significance in industry, e.g., droplets and ice crystals in icing wind tunnel or in mixing phase cloud during airplane icing flight test. An approach is proposed by combining digital inline holography (DIH) and interferometric particle imaging (IPI) techniques, and a setup is elaborately designed using a color camera to simultaneously record DIH and IPI signals of the same droplet/ice crystal in the red and green channels of an red-green-blue (RGB) image, respectively. Water droplets and ice crystals generated in a cooling chamber are experimentally tested. The results show that IPI signals tune from regular interferometric fringes to random speckles as water droplet converts into ice crystal, and it is an obvious and robust indicator to discriminate water droplet and ice crystal. Water droplet sizes in the range from 100 to 300 mu m measured by DIH and IPI coincide with each other, with relative deviations within +/- 5%. Concerning ice crystal, the 2-D Fourier transform of IPI speckle pattern agrees well in both overall shape and size with 2-D autocorrelation of DIH reconstructed in-focus image, with size discrepancy within 10%. With the capability of phase discrimination and size and shape measurement, the proposed method combining DIH and IPI has the potential to be instrumented and applied to cloud particle fields.
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