Abstract
Monte Carlo simulation was used to estimate the errors in counting and sizing rain drops by an instrument using a television scanning system. With the rain-drop analyser, errors result from two effects - the juxtaposition of rain drops and the timing requirements of the electronic circuits. These effects cause a small proportion of droplets to be either rejected and not counted and sized, or counted but sized incorrectly. The expected rejection error was estimated by simulation to be 5% of the droplet population, ie the number of droplets imaged on the vidicon. For populations ranging from 5 to 30 droplets the expected mis-sizing errors ranged from 0 to 12%. The distribution of errors with droplet population obeyed the Poisson probability function. The 90 percentile level of errors increased from 12 to 27% of the droplet population as the population was increased from 5 to 30 droplets.
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