Optics: measuring and testing – For size of particles
Patent
1987-07-28
1990-07-03
Willis, Davis L.
Optics: measuring and testing
For size of particles
356 36, 377 11, 377 53, G01N 1514, G01N 2185
Patent
active
049385925
ABSTRACT:
Apparatus, intended primarily for use in an aerodynamic particle sizing system, for generating a pair of closely-spaced, substantially parallel light beams and for determining particle sizes by measuring the times of flight of particles between the two light beams. The apparatus for generating the light beams includes a laser source, an aperture slit for establishing the shape of the beams, a cylindrical lens for focusing the laser beam on the aperture slit, a diffraction grating for converting the beam from the aperture slit into diffracted beams in the zero order lobe and one first order lobe and a transfer lens for directing the diffracted beams as substantially parallel beams. The particle measuring apparatus includes a prism, a lens arrangement for imaging light scattered by particles passing through one beam on a first face of the prism and for imaging light scattered by particles passing through the other beam on a second face of the prism that is perpendicular to the first face, and a pair of photomultiplier tubes for detecting light reflected by the faces of the prism. Start and stop pulses from the photomultiplier tubes are processed to determine particle time-of-flight which is then converted to particle size.
REFERENCES:
patent: 2628787 (1953-02-01), Payne
patent: 2702471 (1955-02-01), Vonnegut
patent: 2730005 (1956-01-01), Vonnegut
patent: 2732753 (1956-01-01), O'Konski
patent: 2825872 (1958-03-01), Stubbs et al.
patent: 2932394 (1960-04-01), McGinn
patent: 2932966 (1960-04-01), Grindell
patent: 2947164 (1960-08-01), Orr, Jr.
patent: 2986923 (1961-06-01), Vonnegut
patent: 3138029 (1964-06-01), Rich
patent: 3208286 (1965-09-01), Richard
patent: 3220261 (1965-11-01), Kriebel
patent: 3380584 (1968-04-01), Fulwyler
patent: 3434335 (1969-03-01), Langer
patent: 3462608 (1969-08-01), Weston et al.
patent: 3478600 (1969-11-01), Lynn
patent: 3561253 (1971-02-01), Dorman
patent: 3564264 (1971-02-01), Karuhn et al.
patent: 3595078 (1971-07-01), Beck et al.
patent: 3653253 (1972-04-01), Olin
patent: 3678759 (1972-07-01), Schneeberger
patent: 3731464 (1973-05-01), Brumbaugh et al.
patent: 3739180 (1973-06-01), Carlson
patent: 3763428 (1973-10-01), Preist
patent: 3802271 (1974-04-01), Bertelson
patent: 3805591 (1974-04-01), Willis et al.
patent: 3844174 (1974-10-01), Chabre
patent: 3854321 (1974-12-01), Dahneke
patent: 3908465 (1975-09-01), Bartlett
patent: 3938366 (1976-02-01), Wertlake et al.
patent: 4114557 (1978-09-01), DeBrey
patent: 4189937 (1980-02-01), Nelson
patent: 4212190 (1980-07-01), Coover et al.
patent: 4274846 (1981-06-01), Smith
patent: 4294105 (1981-10-01), Kelly
patent: 4298836 (1981-11-01), Groves et al.
W. J. Yanta et al., "The Use of a Laser Doppler Velocimeter in Supersonic Flow", AIAA Paper No. 71-287, March, 1971.
Albert L. Thomas, Jr. et al., "A Portable Photometer and Particle Size Analyzer", ISA Journal, vol. 8, No. 7, July, 1961, pp. 52-56.
The APS33 Aerodynamic Particle Sizer Brochure, TSI Incorporated.
D. B. Blackford et al., "Particle Sizer Analysis with an Aerodynamic Particle Sizer", Proceedings of the 11th Annual Powder and Bulk Solids Conference, Rosemont, Ill., pp. 615-623, May 12-15, 1986.
J. K. Agarwal et al., "An Instrument for Real Time Aerodynamic Particle Size Analysis Using Laser Velocimetry", Proceedings of The Inhalation, Toxicology and Technology Symposium ed. by Basil K. J. Leong, Ann Arbor Science Publishers, 1981, pp. 207-231.
B. Dahneke, "The Capture of Aerosol Particles by Surfaces", Jour. of Colloid and Interface Science, vol. 37, No. 2, Oct., 1971, pp. 342-353.
Ford Norman C.
Poole Trent A.
Amherst Process Instruments, Inc.
Koren Matthew W.
Willis Davis L.
LandOfFree
Beam forming and sensing apparatus for aerodynamic particle sizi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Beam forming and sensing apparatus for aerodynamic particle sizi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Beam forming and sensing apparatus for aerodynamic particle sizi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1886699