Portable analyzer for determining size and chemical composition

Chemistry: analytical and immunological testing – Nuclear magnetic resonance – electron spin resonance or other...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

436183, 250281, 250282, 250286, 250287, 250288, 250289, G01N 2400, B01D 5944, H01J 4900

Patent

active

059982152

ABSTRACT:
A portable analyzer for determining the size and chemical composition of particles suspended in an aerosol. The aerosol is accelerated through a nozzle and skimmers, to produce a well-defined beam of particles, the speed of which is inversely related to the particle size. A dual-beam laser system positioned along the beam path detects light scattered from each particle, to determine the particle's velocity and thus its aerodynamic size. The laser system also triggers a laser to produce a beam that irradiates the particle, to desorb it into its constituent molecules. The particle is desorbed in a source region of a bipolar, time-of-flight mass spectrometer, which provides a mass-to-charge spectrum of the desorbed molecule, thereby chemically characterizing the material of the particle. Several structural features provide sufficient ruggedness to allow the analyzer to be easily used in the field with minimum calibration and maintenance.

REFERENCES:
patent: 3727047 (1973-04-01), Janes
patent: 3854321 (1974-12-01), Dahneke
patent: 4358302 (1982-11-01), Dahneke
patent: 4383171 (1983-05-01), Sinha
patent: 4625112 (1986-11-01), Yoshida
patent: 4694168 (1987-09-01), Le Beyec et al.
patent: 5382794 (1995-01-01), Downey et al.
patent: 5681752 (1997-10-01), Prather
J.J. Stoffels Int. J. Mass Spectrom. Ion Phys, 1981, 40, 217-222.
D.M. Lubman et al, Anal, Chem. 1983, 55, 1437-1440.
A. Lieberman etal. "Aerosols Min. Ind. Work Environ." 1983, vol. 3, V.A. Marple et al. Ed., Ann Arbor Sci: Ann Arbor , Michigan, 811-824.
M. P. Sinha Rev. Sci. Instrum. 1984, 55, 886-891.
T. Bergmann et al. Rev. Sci. Instrum. 1990, 61, 2592-2600.
P.J. McKeown et al. Anal. Chem, 1991, 63, 2069-2073.
F.H. Strobel et al, Anal, Chem. 1992, 64, 754-762.
W.D. Reents Jr. et al. Plasma Sources Sci. Technol. 1994, 3, 369-372.
T.J. Cornish et al. Rapid Commun. Mass Spectrom. 1994, 8, 781-785.
M. Yang et al. Proc. SPIE-Int. Soc. Opt. Eng, 1995, 2385, 51-58.
K.R. Nuebauer et al. Int. J. Mass Spectrom. Ion Processes 1995, 151, 77-87.
W.A. Bryden et al, Proc. SPIE-Int. Soc. Opt. Eng. 1995, 2511, 153-164.
D.M. Murphy et al. Aerosol Sci. Technol. 1995, 22, 237-249.
K.-P. Hinz et al. Aerosol Sci. Technol, 1996, 24, 233-242.
M. Weiss et al. J. Aerosol Sci. 1997, 28, 159-171.
E. Gard et al. Anal. Chem. 1997, 69, 4083-4091.
Dahneke, B., "Sampling and Analysis of Suspended Particles and Vapors by Continuum Source Particle Beams," The American Institute of Chemical Engineers, pp. 134-143, 1980.
Allen, J. et al., "Mass Spectrometric Analyzer of Individual Aerosol Particles," American Institute of Physics, pp. 804-809, Jun. 1981.
Marijnissen, J. et al., "Proposed On-Line Aerosol Analysis Combining Size Determination Laser-Induced Fragmentation and Time-Flight Mass Spectroscopy," J. Aerosol Sci., vol. 19, No. 7, pp. 1307-1310, 1988.
Kievit, O., et al., "On-Line Measurement of Particle Size and Composition," J. Aerosol Sci., vol. 23, Supple. 1, pp. S301-S304, 1992.
Fincke, J.R. et al., "Plasma Spraying of Alumina: Plasma and Particle Flow Fields," Plasma Chemistry and Plasma Processing, vol. 13, No. 4, pp. 579-600, 1993.
Nordmeyer T. et al., "Real-Time Measurement Capabilities Using Aerosol Time-of-Flight mass Spectrometry," Analytical Chemistry, vol. 66, No. 20, Oct. 15, 1994, 3540-3542.
Prather, K. et al., "Real-Time Characterization of Individual Aerosol Particles Using Time-of-Flight Mass Spectrometry," Analytical Chemistry, vol. 66, No. 9, May 1, 1994, 1403-1407.
Johnston, M. et al., "MS of Individual Aerosol Particles," Analytical Chemistry, pp. 721-726, Dec. 1, 1996.
Noble, C. et al., "Aerosol Characterization Using Mass Spectrometry," Trends in Analytical Chemistry, vol. 13, No. 5, 1994, 218-222.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Portable analyzer for determining size and chemical composition does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Portable analyzer for determining size and chemical composition , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Portable analyzer for determining size and chemical composition will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-822803

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.