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Proceedings Paper

Safety of optical systems in hazardous areas
Author(s): Graham Tortoishell
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Paper Abstract

It had been considered that the use of optical systems in potentially explosive atmospheres did not constitute an explosion risk. It has been established that very small objects heated electrically or optically can ignite such atmospheres. This paper summarises work carried out by the author and others to investigate the effects of power object size the nature of the flammable gas or vapour and the nature of the heated object. It has been shown that for all the gases and vapours tested with both catalytic and non-catalytic objects an apparent ignition boundary exists. The use of tethered objects and free" falling dust particles has shown that there is an apparent safety margin between the two cases. The work included objects which are inert combustible or metallic to determine the effect of target material on the power required to cause ignition of the flammable gas or vapour and flammable materials having a range of ignition temperatures and ignition energies. 2.

Paper Details

Date Published: 1 August 1990
PDF: 10 pages
Proc. SPIE 1266, In-Process Optical Measurements and Industrial Methods, (1 August 1990); doi: 10.1117/12.20265
Show Author Affiliations
Graham Tortoishell, Sira Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 1266:
In-Process Optical Measurements and Industrial Methods
H. A. Macleod; Peter Langenbeck, Editor(s)

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