초록 ▼

A sensor for measuring the velocity components of particles in an atmospheric volume which comprises means for generating first and second coherent radiation beams, means for directing said first and second radiation beams towards said particles, said beams being spaced apart and positioned to inter

A sensor for measuring the velocity components of particles in an atmospheric volume which comprises means for generating first and second coherent radiation beams, means for directing said first and second radiation beams towards said particles, said beams being spaced apart and positioned to intersect each other in the region of said particles, said particles having a longitudinal velocity component along the bisector of said beams and a transverse velocity component perpendicular thereto, means for receiving Doppler-shifted radiation back-scattered from said first and second beams, a reference beam of radiation temporally coherent to said first and second coherent beams, means for mixing said temporally coherent, reference radiation with said received Doppler-shifted radiation for detecting a beat frequency spectrum, and means connected to receive said beat frequency spectrum for determining from the frequency values of said beat frequency spectrum, the average longitudinal and transverse velocity components of said particles. A method of measuring the velocity components of particles utilizing separate radiation beams and a radiation reference source used as a local oscillator is also disclosed.

대표청구항 ▼

A method of measuring velocity components of a plurality of particles comprising: (a) generating first and second coherent radiation beams; (b) directing said first and second radiation beams toward said plurality of particles, said beams being spaced apart and positioned to intersect each other in

A method of measuring velocity components of a plurality of particles comprising: (a) generating first and second coherent radiation beams; (b) directing said first and second radiation beams toward said plurality of particles, said beams being spaced apart and positioned to intersect each other in a region of said plurality of particles, said plurality of particles generally having a longitudinal velocity component along the bisector of said beams and a transverse velocity component perpendicular thereto in the plane defined by the beams; (c) receiving Doppler shifted radiation back-scattered from said plurality of particles along the direction of said first and second beams; (d) mixing temporally coherent reference radiation with said received Doppler-shifted radiation for detecting a beat frequency spectrum; and (e) determining from the beat frequency values of said beat frequency spectrum the longitudinal and transverse velocity components of said plurality of particles, said longitudinal component determined from the average value of a peak in said spectrum and said transverse component determined from the average value of the difference between said peak and a sideband of said peak.