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Review of Measurements and Candidate Signatures for Early Fire Detection. [ABSTRACT ONLY]


pdf icon Review of Measurements and Candidate Signatures for Early Fire Detection. [ABSTRACT ONLY] (147 K)
Grosshandler, W. L.

NISTIR 5499; September 1994.

National Institute of Standards and Technology. Annual Conference on Fire Research: Book of Abstracts. October 17-20, 1994, Gaithersburg, MD, 137-138 pp, 1994.

Available from:

National Technical Information Service
Order number: PB95-104964

Keywords:

fire research; fire detection; smoke detection; heat detection; thermistors; charged particles; thermopiles

Abstract:

The current generation of fire detection systems is designed to respond to the smoke, heat, or the elastromagnetic radiation generated during smoldering and flaming combustion. Smoke is sensed either by measuring, with a photodector, the light shich is scattered from a controlled light source, or by the change in current created by charged particles passing through an ionizing radiaiton field. Heat can be easily sensed by a number of conventional devices, such as compensated thermocouples and thermistors. Both the absolute temperature and rate of temperature rise are used to define alarm conditions. The ultraviolet and infrared portions of the electromagnetic spectrum are typically detected with vacuum tube and solid state photodiodes, photoconductive and photovoltaic cells, thermopiles and pyroelectric cells.