Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1980-11-26
1983-05-31
Buczinski, S. C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
350105, 356338, 356342, 356343, 523172, G01P 336
Patent
active
043858309
ABSTRACT:
An optical system for direct measurement of vorticity in a flowing fluid is disclosed. Spherical particles suspended in the flow rotate with an angular velocity that is accurately equal to half the local vorticity; thus, measurements of the rotation rates of such particles indicate the vorticity. The particles are transparent, and preferably are less than 50 .mu.m diameter, and each contains embedded planar crystal mirrors. The particles are suspended in a refractive index matched liquid. Measurement of the particle rotation rate and thus the vorticity of the fluid is preferably accomplished by measuring the rotation rates of reflections of one or more light beams from the planar mirrors. The measurements may be carried out using any system of position sensitive optical detectors such as photo sensitive devices screened by suitable slits or photo diode arrays.
REFERENCES:
patent: 1516608 (1924-11-01), Kidde et al.
patent: 1807659 (1931-06-01), Grant, Jr.
patent: 2866935 (1958-12-01), Robillard
patent: 3145114 (1964-08-01), Rindone
patent: 3171827 (1965-03-01), De Vries et al.
patent: 3245307 (1966-04-01), Lang
patent: 3428514 (1969-02-01), Greer et al.
patent: 3787874 (1974-01-01), Urban
patent: 3941477 (1976-03-01), Schodl
patent: 4206999 (1980-06-01), Keller
Y. Loh et al., J. Phys. E: Sci. Instrum., vol. 14, No. 8, Aug. 1981, pp. 981, 356-428
"Measurement of the Rate of Strain Tensor in a Tubulent Liquid Using Light Scattered from Asymmetric Particles", W. W. Webb, D. H. Johnson, Bulletin of American Physical Society, 1972.
"Direct Optical Measurement of Vorticity", M. B. Frish and W. W. Webb, Bulletin of the American Physical Society, Oct. 1979.
Experimental Plastics: A Practical Course for Students, Redfarn and Bedford, Interscience, 1960.
"Vorticity and Turbulence Production in Pattern Recognized Turbulent Flow Structure", Physics of Fluids, 20, H. Eckelmann, S. C. Nychas; R. S. Brodkey, J. M. Wallace, 1972.
"Survey and New Measurements of Turbulent Structure Near the Wall", Physics of Fluids, 20, W. W. Willmarth and T. J. Bogar, 1977.
"Grid Turbulence in Air and Water", Physics of Fluids, 22, F. N. Frenkiel; P. S. Klebanoff and T. T. Huang, 1979.
"The Motion of Ellipsoidal Particles Immersed in a Viscous Fluid", Proc. Roy, Soc. A 102, G. B. Jeffrey, 1922.
"Hydromechanics of Low-Reynolds-Number Flow, Part 1: Rotation of Axisymmetric Prolate Bodies", J. Fluid Mech. 63, A Chwang and T. Wu.
"Contribution to Suspension Polymerization", Makromolekulare Chemie, 78, H. Hopff; H. Lussi; P. Gerspacher, 1964.
"The Vorcom, Part 2: Demonstration Vorticity Measurements", Third Annual Report, NASA, Langley Research Center, J. F. Floss, 1977.
Frish Michael B.
Webb Watt W.
Buczinski S. C.
Cornell Research Foundation Inc.
LandOfFree
Direct measurement of vorticity by optical probe does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Direct measurement of vorticity by optical probe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct measurement of vorticity by optical probe will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2244205