Development of an Inexpensive Raindrop Size Spectrometer

William Henson Atmospheric Physics Group, Department of Physics, University of Auckland, Auckland, New Zealand

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Geoff Austin Atmospheric Physics Group, Department of Physics, University of Auckland, Auckland, New Zealand

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Harry Oudenhoven Atmospheric Physics Group, Department of Physics, University of Auckland, Auckland, New Zealand

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Abstract

The deployment of weather radar, notably in mountainous terrain with many microclimates, requires the use of several or even many drop size spectrometers to provide confidence in the quantitative relation between radar reflectivity and rainfall. While there are several different commercial disdrometers available they are all expensive, large, or fragile, which militates against multiple deployment in the field. The design brief was for a reasonably accurate and sensitive, low-cost and rugged disdrometer to support field work. A design based on piezoceramic disks normally used in hydrophones is described. Calibration and typical field results are presented.

Current affiliation: Atmospheric/Oceanic Sciences Department, McGill University, Montreal, Quebec, Canada

Corresponding author address: Dr. William Henson, McGill University, Montreal, QC H3A 2K6, Canada. Email: henson@zephyr.meteo.mcgill.ca

Abstract

The deployment of weather radar, notably in mountainous terrain with many microclimates, requires the use of several or even many drop size spectrometers to provide confidence in the quantitative relation between radar reflectivity and rainfall. While there are several different commercial disdrometers available they are all expensive, large, or fragile, which militates against multiple deployment in the field. The design brief was for a reasonably accurate and sensitive, low-cost and rugged disdrometer to support field work. A design based on piezoceramic disks normally used in hydrophones is described. Calibration and typical field results are presented.

Current affiliation: Atmospheric/Oceanic Sciences Department, McGill University, Montreal, Quebec, Canada

Corresponding author address: Dr. William Henson, McGill University, Montreal, QC H3A 2K6, Canada. Email: henson@zephyr.meteo.mcgill.ca

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