DISDROMETERS are instruments that measure and record sizes of
raindrops; it consists of a transponder that measures momentum
of individual drops as they fall onto an exposed horizontal
surface and the size is determined by calibration and the drop
size distribution (a tally of number of drops of different size
categories).
A disdrometer is an instrument used to measure the drop size distribution and velocity of falling hydrometeors. Some disdrometers can distinguish between rain, graupel, and hail. The uses for disdrometers are numerous. They can be used for traffic control, scientific examination, airport observation systems, and hydrology. The latest disdrometers employ microwave or laser technologies. 2D video disdrometers can be used to analyze individual raindrops and snowflakes.
