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Title: Ionization detection system for aerosols

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 utilizes a measuring ionization chamber which is modified to minimize false alarms and reductions in sensitivity resulting from changes in ambient temperature. In the preferred form of the modification, an annular radiation shield is mounted about the usual radiation source provided to effect ionization in the measuring chamber. The shield is supported by a bimetallic strip which flexes in response to changes in ambient temperature, moving the shield relative to the source so as to vary the radiative area of the source in a manner offsetting temperature-induced variations in the sensitivity of the chamber.

Inventors:
 [1]
  1. (Chillicothe, OH)
Publication Date:
Research Org.:
Goodyear Atomic Corp., Portsmouth, Ohio
OSTI Identifier:
862843
Patent Number(s):
US 4027165
Assignee:
United States of America as represented by United States Energy (Washington, DC) OSTI
DOE Contract Number:  
AT(33-2)-1
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
ionization; detection; aerosols; relates; improved; smoke-detection; ionization-chamber; type; preferred; embodiment; utilizes; conventional; detector; head; comprising; measuring; chamber; reference; normally; non-conductive; gas; triode; discharging; threshold; concentration; airborne; particulates; modified; minimize; false; alarms; reductions; sensitivity; resulting; changes; ambient; temperature; form; modification; annular; radiation; shield; mounted; source; provided; effect; supported; bimetallic; strip; flexes; response; moving; relative; vary; radiative; manner; offsetting; temperature-induced; variations; measuring chamber; false alarms; radiation shield; preferred embodiment; ambient temperature; radiation source; ionization chamber; preferred form; detector head; measuring ionization; airborne particulate; bimetallic strip; airborne particulates; ionization detection; metallic strip; head comprising; improved smoke-detection; conventional detector; conductive gas; ionization-chamber type; /250/340/

Citation Formats

Jacobs, Martin E. Ionization detection system for aerosols. United States: N. p., 1977. Web.
Jacobs, Martin E. Ionization detection system for aerosols. United States.
Jacobs, Martin E. Sat . "Ionization detection system for aerosols". United States. https://www.osti.gov/servlets/purl/862843.
@article{osti_862843,
title = {Ionization detection system for aerosols},
author = {Jacobs, Martin E.},
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 utilizes a measuring ionization chamber which is modified to minimize false alarms and reductions in sensitivity resulting from changes in ambient temperature. In the preferred form of the modification, an annular radiation shield is mounted about the usual radiation source provided to effect ionization in the measuring chamber. The shield is supported by a bimetallic strip which flexes in response to changes in ambient temperature, moving the shield relative to the source so as to vary the radiative area of the source in a manner offsetting temperature-induced variations in the sensitivity of the chamber.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {1}
}

Patent:

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