Document Detail

Simultaneous velocity and pressure measurements using luminescent microspheres.
MedLine Citation:
PMID:  20590251     Owner:  NLM     Status:  MEDLINE    
Using the technique of modified rapid lifetime determination, pressure-sensitive microspheres, known as PrSBeads, were used to make quantitative oxygen measurements over two-dimensional areas within gaseous flows. Aerosolized PrSBeads in carrier gases of varying oxygen concentrations demonstrated point measurement precisions on the order of 0.1%-1%. A charge-coupled device featuring a double image frame (DIF) feature was used to make spatially resolved pressure measurements within gas phase flows. Errors on the order of 0.5 atm for one standard deviation were demonstrated when 2 x 2 pixel binning (162 x 128 pixel overall resolution) was used, but improved to 0.003-0.005 atm with the use of 32 x 32 pixel binning (10 x 8 pixel overall resolution). Experiments demonstrate the ability to resolve the oxygen concentration differences between a N(2) jet and the surrounding ambient air environment and the ability to measure instantaneous air pressure changes within a square syringe as the plunger is moved in and out. In addition, instantaneous velocity measurements of the airborne PrSBeads in a square syringe were achieved using digital particle image velocimetry at frame rates of 6.4 Hz, thus validating PrSBeads as a tool to simultaneously measure the velocity and pressure within an aerodynamic flow.
Fletcher Kimura; Jesse McCann; Gamal E Khalil; Dana Dabiri; Younan Xia; James B Callis
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Validation Studies    
Journal Detail:
Title:  The Review of scientific instruments     Volume:  81     ISSN:  1089-7623     ISO Abbreviation:  Rev Sci Instrum     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-07-01     Completed Date:  2010-09-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0405571     Medline TA:  Rev Sci Instrum     Country:  United States    
Other Details:
Languages:  eng     Pagination:  064101     Citation Subset:  IM    
Department of Chemistry, University of Washington, Seattle, Washington 98195, USA.
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MeSH Terms
Aerosols / chemistry
Air Pressure
Equipment Design
Gases / chemistry
Luminescent Measurements / instrumentation*,  methods*
Models, Chemical
Oxygen / chemistry
Time Factors
Reg. No./Substance:
0/Aerosols; 0/Gases; 7727-37-9/Nitrogen; 7782-44-7/Oxygen

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