Patent ID: 6646725
Filing Date: 2003-11-11
Classification: G01P,G01S,Y02A

Abstract:
A system for measuring a first axis projection and a second axis projection of a velocity of a distribution of particulate matter, the system comprising:at least three first light emitters disposed along the first axis at irregular distances from one another and aimed substantially perpendicular to the first axis for aiming at and illuminating the distribution to cause a first light signal to be reflected from the distribution; at least three second light emitters disposed along the second axis at irregular distances from one another and aimed substantially perpendicular to the second axis for aiming at and illuminating the distribution to cause a second light signal to be reflected from the distribution; a detector for receiving the first light signal to produce a first detector signal and for receiving the second light signal to produce a second detector signal; a controller coupled to the first light emitters, the second light emitters, and the detector, the controller programmed or adapted to calculate the first axis projection and the second axis projection of the velocity of the distribution in response to the first and second detector signals.