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Title: Ionization-chamber smoke detector system

Abstract

This invention relates to an improved smoke-detection system of the ionization-chamber type. In the preferred embodiment, the system utilizes a conventional detector head comprising a measuring ionization chamber, a reference ionization chamber, and a normally non-conductive gas triode for discharging when a threshold concentration of airborne particulates is present in the measuring chamber. The improved system is designed to reduce false alarms caused by fluctuations in ambient temperature. Means are provided for periodically firing the gas discharge triode and each time recording the triggering voltage required. A computer compares each triggering voltage with its predecessor. The computer is programmed to energize an alarm if the difference between the two compared voltages is a relatively large value indicative of particulates in the measuring chamber and to disregard smaller differences typically resulting from changes in ambient temperature.

Inventors:
 [1]
  1. Jackson, OH
Issue Date:
Research Org.:
Goodyear Atomic Corp., Portsmouth, Ohio
OSTI Identifier:
862675
Patent Number(s):
3987423
Application Number:
05/643,466
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G08 - SIGNALLING G08B - SIGNALLING OR CALLING SYSTEMS
DOE Contract Number:  
AT(33-2)-1
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
ionization-chamber; smoke; detector; relates; improved; smoke-detection; type; preferred; embodiment; utilizes; conventional; head; comprising; measuring; ionization; chamber; reference; normally; non-conductive; gas; triode; discharging; threshold; concentration; airborne; particulates; designed; reduce; false; alarms; caused; fluctuations; ambient; temperature; means; provided; periodically; firing; discharge; time; recording; triggering; voltage; required; computer; compares; predecessor; programmed; energize; alarm; difference; compared; voltages; relatively; value; indicative; disregard; differences; typically; resulting; changes; measuring chamber; false alarms; preferred embodiment; ambient temperature; ionization chamber; gas discharge; detector head; reduce false; voltage required; measuring ionization; airborne particulate; airborne particulates; head comprising; improved smoke-detection; conventional detector; conductive gas; ionization-chamber type; /250/340/700/

Citation Formats

Roe, Robert F. Ionization-chamber smoke detector system. United States: N. p., 1976. Web.
Roe, Robert F. Ionization-chamber smoke detector system. United States.
Roe, Robert F. Tue . "Ionization-chamber smoke detector system". United States. https://www.osti.gov/servlets/purl/862675.
@article{osti_862675,
title = {Ionization-chamber smoke detector system},
author = {Roe, Robert F},
abstractNote = {This invention relates to an improved smoke-detection system of the ionization-chamber type. In the preferred embodiment, the system utilizes a conventional detector head comprising a measuring ionization chamber, a reference ionization chamber, and a normally non-conductive gas triode for discharging when a threshold concentration of airborne particulates is present in the measuring chamber. The improved system is designed to reduce false alarms caused by fluctuations in ambient temperature. Means are provided for periodically firing the gas discharge triode and each time recording the triggering voltage required. A computer compares each triggering voltage with its predecessor. The computer is programmed to energize an alarm if the difference between the two compared voltages is a relatively large value indicative of particulates in the measuring chamber and to disregard smaller differences typically resulting from changes in ambient temperature.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1976},
month = {10}
}

Patent:

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