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In situ calibration is a proposed strategy for continuous as well as initialcalibration of an impact disdrometer. In previous work, a collocated tippingbucket had been utilized to provide a rainfall rate based ~11/3 momentreference to an impact disdrometer's signal processing system forimplementation of adaptive calibration. Using rainfall rate only,transformation of impulse amplitude to a drop volume based on a simple powerlaw was used to define an error surface in the model's parameter space. Byincorporating optical extinction second moment measurements with rainfall ratedata, an improved in situ disdrometer calibration algorithm results due toutilization of multiple (two or more) independent moments of the drop sizedistribution in the error function definition. The resulting improvement incalibration performance can be quantified by detailed examination of theparameter space error surface using simulation as well as real data.

In Situ Disdrometer Calibration Using Multiple DSD Moments