Review of Measurements and Candidate Signatures for Early Fire Detection. [ABSTRACT ONLY]
Review of Measurements and Candidate Signatures for
Early Fire Detection. [ABSTRACT ONLY]
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
fire research; fire detection; smoke detection; heat
detection; thermistors; charged particles; thermopiles
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.