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Mining Publication: Ignition Tests With a Fiber-Optic Powered Instrument
Keywords: Fiber optic systems Fire and explosion prevention Ignitions Instruments
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: September 1996
Authors: TH Dubaniewicz, KL Cashdollar, GR Cucci
Conference Paper - September 1996
Download PDF Document (0.38 MB)
NIOSHTIC2 Number: 20023919
Proc 41st Annual ISA Analysis Div. Symposium, 1996, Framingham, Massachusetts, 29, 1996; :175-184
New types of industrial instruments use fiber-coupled laser energy to power remote sensors. Fiber-optic based instruments are useful in classified (hazardous) locations found in many industrial plants because the fiber provides a natural barrier against accidental electrical discharge into potentially explosive atmospheres. However, current safety standards do not cover the use of laser-powered fiber-optic instruments in potentially explosive environments such as found in coal mines. The U.S. Bureau of Mines began an investigation of laser-powered fiber-optic instruments in explosive atmospheres in support of the standard-making process. A commercial fiber-optic interface system, modified to simulate several worst-case operating conditions, ignited explosive hydrogen-air mixtures. Worst-case simulations consisted of disabling a safety shutoff feature, operating the laser at significantly higher powers than intended for normal operations, and cleaving fiber-optic connections to direct laser energy onto selected absorptive materials. At the highest power level available, the fiber-optic interface system did not ignite selected methane-air mixtures. The obtained data should prove useful in establishing appropriate safety standards.
Image of publication Ignition Tests With a Fiber-Optic Powered InstrumentConference Paper - September 1996
Download PDF Document (0.38 MB)
NIOSHTIC2 Number: 20023919
Proc 41st Annual ISA Analysis Div. Symposium, 1996, Framingham, Massachusetts, 29, 1996; :175-184
See Also
Battery Safety Enhancements for Underground Coal Mines
Continuous Wave Laser Ignition Thresholds of Coal Dust Clouds
Further Study of the Intrinsic Safety of Internally Shorted Lithium and Lithium-ion Cells Within Methane-air
Ignition of Hydraulic Fluid Sprays by Open Flames and Hot Surfaces
Ignition of Methane-Air Mixtures by Laser Heated Small Particles
Investigation of Ampacity Derating Factors for Shuttle Cars Using Fiber Optics Technology
Lasers
Methane-Air Mixtures Ignited by CW Laser-Heated Targets on Optical Fiber Tips: Comparison of Targets, Optical Fibers, and Ignition Delays
Technical Solutions for Enhancements to Mine Safety Using Barricade II Fire Blocking Gel
Threshold Powers and Delays for Igniting Propane and Butane-Air Mixtures by CW Laser-heated Small Particles
Page last reviewed: July 20, 2015
Page last updated: July 20, 2015
Content source: National Institute for Occupational Safety and Health, Mining Program
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