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Threshold powers and delays for igniting propane and butane-air mixtures by continuous-wave laser-heated small particles.

Authors
Dubaniewicz-TH Jr.
Source
J Laser Appl 2006 Nov; 18(4):312-319
NIOSHTIC No.
20031214
Abstract
The National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory conducted a study of laser safety in potentially flammable environments. Researchers measured threshold igniting powers as a function of beam diameter for butane and propane-air mixtures by laser-heating targets placed on optical fiber tips using a 1064 nm laser. The minimum igniting powers for propane-air and butane-air were about 250 and 300 mW, respectively. Threshold igniting powers for propane-air were approximately proportional to beam diameter for beam diameters from 0.1 to 2.0 mm. Results suggest that relatively powerful beams may be used in these atmospheres without causing ignition, provided the beam diameter is controlled. Threshold ignition delay times using 9/125 and 62.5/125 um fibers were approximately proportional to the inverse square of the laser power. Ignition delays were about 45 ms or longer for laser powers up to 800 mW. Preproduction samples of a commercial optical fuse prevented ignitions under selected test conditions. A self-healing effect was observed for one sample. Comparisons are made with the results of other researchers.
Keywords
Propanes; Butenes; Laboratory-work; Laboratory-testing; Flammable-gases; Flammable-liquids; Environmental-factors; Environmental-hazards; Air-monitoring; Sampling
Contact
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, 626 Cochrans Mill Road, Pittsburgh, PA 15236
CODEN
JLAPEN
Publication Date
20061101
Document Type
Journal Article
Email Address
tcd5@cdc.gov
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
1042-346X
NIOSH Division
PRL
Source Name
Journal of Laser Applications
State
PA
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