A Hologram Imager Instrument for Ground Plane Measurements of Hydrometeors

Ville A. Kaikkonen, Anssi J. Mäkynen

Abstract

This paper presents a holographic hydrometeor imager aimed for in-situ measurement of falling hydrometeors. The hydrometeor imager is based on in-line holographic imaging, which enables larger imaging volumes than can be achieved using traditional imaging techniques. By numerically reconstructing holograms containing the hydrometeors, detailed images of rain drops and snowflakes with resolutions of tens of micrometers are acquired, as well as the local 3D position of individual hydrometeors inside the measurement volume. The reconstructed in-focus images of hydrometeors are analyzed using conventional image analysis techniques to extract the properties of individual hydrometeors. The imaging equipment is described and the results from the first field measurement are presented.

Keywords

digital holography, image analysis, laser, radar, snowflake, meteorology

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DOI

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IMEKO TC

TC19 - Environmental Measurements

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