Laser doppler velocimeter for measuring torsional vibration

Details Laser doppler velocimeter for measuring torsional vibration Laser doppler velocimeter for measuring torsional vibration

1982-09-29

1985-11-05

Buczinski, S. C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

73657, 35016223, G01P 336, G01B 902, G01N 2141, G01N 2904

Patent

active

045510172

ABSTRACT:
The velocity and change in velocity of a rotating or otherwise moving surface is measured by a laser Doppler technique. In particular, a diffraction grating is formed on the moving surface either by machining processes or by affixing a ready-made grating thereto. The grating surface exhibits periodicity in one or more directions, either separately or simultaneously. The presence of the grating produces Bragg order diffraction reflections at specific angles relative to the surface. These Bragg order reflections contain information, in the form of Doppler shifts, concerning the motion of the surface and the body to which it is attached. This Bragg order Doppler shift information is readily analyzable using conventional signal processing apparatus and processes to produce the desired velocity and torsional vibration information.

REFERENCES:
patent: 3419330 (1965-04-01), Schneider
patent: 3604804 (1971-09-01), Penney et al.
patent: 3687512 (1972-08-01), Brun
patent: 3858203 (1974-12-01), Constant
M. K. Mazumder, Applies Physics Letters, vol. 16, No. 11, Jun. '70, pp. 462-464.
J. W. Goodman, "Some Fundamental Properties of Speckle", Journal of the Optical Society of America, vol. 66, No. 11, Nov. 1976.
D. G. Simpson and D. G. S. Lamb, "A Laser Doppler System for the Measurement of Torsional Vibration", NEL Report #639, Jul. 1977.

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