Vibration-free Raman Doppler velocimeter

Details Vibration-free Raman Doppler velocimeter Vibration-free Raman Doppler velocimeter

1985-04-25

1986-11-25

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356301, G01P 336, G01J 344

Patent

active

046245618

ABSTRACT:
Method and apparatus unaffected by vibrational environments for obtaining measurements using Raman Doppler Velocimetry. Two laser beams, a pump beam 18 and a probe beam 22, are focused by a lens 21 to a point 25 in a flow 11. A lens 26 collimates the two beams. A beam splitter 27 dumps beam 18 and beam 22 is reflected by a corner cube 28 back to lens 26. Lens 26 then focuses the beam back to point 25. The reflected beam 22 and the backward and forward scattering at point 25 are detected by a detector 30 and processed by a boxcar averager 31. The lens 26 and corner cube 28 combination, called a retrometer 29, ensure that the measurements are unaffected by vibrations.

REFERENCES:
patent: 3540801 (1970-11-01), Schmidt
patent: 3625613 (1971-12-01), Abell et al.
patent: 4026655 (1977-05-01), Gunter, Jr.
patent: 4176950 (1979-12-01), Franke
patent: 4193690 (1980-03-01), Levenson et al.
patent: 4483614 (1984-11-01), Rogers
patent: 4505586 (1985-03-01), Tochigi et al.
Y. Vasilenko et al, Opt. Spectrosc., vol. 41, No. 1, Jul. 1976, p. 73.
J. Oldengarm et al, Optics & Laser Tech, Dec. '73, vol. 5, No. 6, p. 249.

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