Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1978-04-19
1979-09-25
Buczinski, S. C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
343 8, G01P 336
Patent
active
041689062
ABSTRACT:
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.
REFERENCES:
patent: 3915572 (1975-10-01), Orloff
patent: 4026655 (1977-05-01), Gunter, Jr.
patent: 4028673 (1977-06-01), Taylor
patent: 4036557 (1977-07-01), Christensen
patent: 4101890 (1978-07-01), Goyard
T. R. Lawrence et al., The Review of Scientific Instruments, vol. 43, No. Mar. 1972.
Clark et al., American Journal of Physics, vol. 38, No. 5, p. 575, May 1970.
Schwiesow et al., Applied Optics, vol. 16, No. 5, p. 1145.
Buczinski S. C.
Englert Alvin J.
Pawlikowski Eugene J.
The United States of America as represented by the Secretary of
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