Raindrop Velocity Spectrometer for Drop Chemistry Investigations

S. G. Bradley Department of Physics, The University of Auckland, Auckland, New Zealand

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Abstract

The design of an instrument that sorts raindrops according to fall speed is described. The apparatus consists of two rotating disks, the upper one allowing rain to fall through a slit into collectors on the lower disk. Drops are collected in a manner allowing chemical concentrations and pH to be determined as a function of drop size. Laboratory and field tests validate the detailed design theory for conditions of low windspeed.

Abstract

The design of an instrument that sorts raindrops according to fall speed is described. The apparatus consists of two rotating disks, the upper one allowing rain to fall through a slit into collectors on the lower disk. Drops are collected in a manner allowing chemical concentrations and pH to be determined as a function of drop size. Laboratory and field tests validate the detailed design theory for conditions of low windspeed.

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