Record Display for the EPA National Library Catalog


Main Title Time-of-flight aerosol beam spectrometer for particle size measurements /
Author Dahneke, Barton Eugene.
CORP Author Rochester Univ., N.Y. Dept. of Radiation Biology and Biophysics.;Environmental Sciences Research Lab., Research Triangle Park, N.C.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, Environmental Sciences Research Laboratory,
Year Published 1977
Report Number EPA/600/2-77/229
Stock Number PB-276 644
OCLC Number 42252562
Subjects Time-of-flight mass spectrometry ; Particle size determination ; Aerosols--Environmental aspects--Measurement
Additional Subjects Aerosols ; Particle size distribution ; Aerodynamic characteristics ; Stokes law(Fluid mechanics) ; Rarified gas dynamics ; Design criteria ; Performance evaluation ; Experiments ; Calibrating ; Electronic equipment ; Optical equipment ; Vacuum apparatus ; Air pollution ; Time of flight aerosol beam spectrometers ; Air pollution detection ; TOFABS system
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 600/2-77-229 c.1 Headquarters Library/Washington,DC 04/08/2014
EKBD  EPA-600/2-77-229 Research Triangle Park Library/RTP, NC 06/27/2003
ELBD ARCHIVE EPA 600/2-77-229 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ESAD  EPA 600-2-77-229 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-276 644 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation vii, 85 p. : ill. ; 28 cm.
A time-of-flight aerosol beam spectrometer (TOFABS) is described. The instrument has been designed and constructed to perform in situ real time measurements of the aerodynamic size of individual aerosol particles in the range 0.3 to 10 micrometers diameter. The measurement method consists of (1) allowing a sample aerosol to undergo expansion through a nozzle into a vacuum chamber, such that each particle acquires a terminal velocity depending on its aerodynamic size, then (2) measuring the terminal velocity by determining the time taken for each particle to traverse a laser beam of fixed width. An experimental calibration curve relating time-of-flight and aerodynamic size, based on the use of polystyrene latex spheres, is shown to be in good agreement with a theoretical calibration obtained from the gas-particle dynamics equations. A comprehensive discussion of the properties and uses of aerosol beams is included as an appendix.
"EPA-600/2-77-229." EPA grant no. R 803065 ; EPA project officer: Charles W. Lewis.