TIME OF FLIGHT STATISTICS OF RANGE FINDER LASER IMPULSES SCATTERED ON ENSEMBLE OF AEROSOL PARTICLES

摘要

Due to the statistical nature of scattered light there is an apparent propagation delay uncertainty when detecting scattered impulses originated from different scattering volumes. Because of the randomness of particle number, size and refractive index - scattered intensity is a random variable itself. For this reason the scattered impulse builds up randomly. If light propagation is assessed by its scattered trace, the effect leads to an apparent propagation delay uncertainty. The phenomenon is similar to the so called jitter in electrotechnics. This delay is a function of aerosol concentration and size distribution. The scope of this work is to measure and calculate the extent of this uncertainty for use in subsequent measurement units.