The Counting Distribution Function of Random Signal Generated by Optical Sensor in Optical Particle Counter

摘要

For studying the statistical character of the random signal, the width and amplitude of two relatively independent characteristic parameters are used to establish the two-parameter describing model of the random signal. On the foundation of this, the amplitude and width counting distributions of random scattering pulse signal are statistical analyzed by using the measuring system which combines the high-speed data acquisition card PCI-9812 and the counting optical sensor of submicron monodisperse particles. The experimental results show that the amplitude and width distributions of the random scattering pulse signals' subsets match well with the form of the lognormal distribution, but the independent variablethe is the natural number and normalized coefficient is not (2π)~(1/2). In further, the calculating and experimental results indicate that the normalized coefficient of the counting distribution function for random pulse signal relates to the boundary V_0 and V_M of measured values. If boundary values different are, the corresponding normalized coefficients also different are.