METHOD OF MEASURING VELOCITY AND DIAMETER OF PARTICLES IN FLOW Russian patent published in 1995 - IPC

FIELD: experimental hydro- and aerodynamics. SUBSTANCE: method involves the steps of: forming a probing field with a predetermined spatial-time structure in a flow region to be tested and forming an optic signal containing an image of scattering particle, spatially separating the optic signal into two signals, inverting the particle image of one of these signals and recombining the direct and inverted optic signals, spatially separating the recombined optic signal into two in one of which the inverted signal and direct one are in phase and in the other they are out-of-phase, performing photoelectric conversion of in phase and out-of-phase optic signals, subtracting photoelectric signals corresponding to in phase and out-of-phase optic signals, measuring duration of radio pulses in a resultant differential electric signal and particle velocity by multiplying radio pulse duration by a half the measured velocity. EFFECT: enhanced accuracy, widened dynamic measurement range. 4 dwg