INFLUENCE OF THE SIZE AND FALLING POSITIONS OF RAIN－DROPS ON THE PRECISION OF THEIR RADIUS MEASUREMENT
Yan Banghua（Nanjing Air Force Institute of Meteorology）
The influence of the size and falling positions of the rain-drops on the precision of their radiusmeasurement is studied by means of the geometrical theory of optics. The anslysis shows that the rain-drops of the same radius can receive more scattering light and give less peak values of light scintillationsignals if they are closer to the receiver．The rain－drops of different radii produce different effectivelight elimination coefficients and lead to a bigger measure error．The classified processing of the rain-drops can reduce the error to 0．04 mm or less.
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