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Ionization detector

Patent:

Abstract

This invention concerns a fire detection system making use of a beta source. The ionisation detector includes a first and second chamber respectively comprising a first and second electrode, preferably a plate, with a common electrode separating the first and second chamber. Communication is provided between these chambers through a set of orifices and each chamber also has a set of orifices for communication with the ambient atmosphere. One or both chambers can comprise a particle source, preferably beta. The detector also has an adjustable electrode housed in one of the chambers to regulate the voltage between the fixed electrode of this chamber and the common electrode located between the chambers. The electrodes of the structure are connected to a detection circuit that spots a change in the ionisation current when a fire alarm condition arises. The detection circuit of a new type includes a relaxation oscillator with a programmable unijunction transistor and a light emitting diode.
Authors:
Publication Date:
Feb 27, 1976
Product Type:
Patent
Report Number:
FR 2317765; A
Reference Number:
AIX-10-452481; EDB-79-106794
Resource Relation:
Patent Priority Date: Priority date 7 Jul 1975, United States of America (USA)
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; SMOKE DETECTORS; DESIGN; BETA SOURCES; FIRES; IONIZATION CHAMBERS; SAFETY ENGINEERING; SPECIFICATIONS; ENGINEERING; MEASURING INSTRUMENTS; PARTICLE SOURCES; RADIATION DETECTORS; RADIATION SOURCES; 440105* - Radiation Instrumentation- Radiometric Instruments- (-1987)
OSTI ID:
5989205
Country of Origin:
France
Language:
French
Submitting Site:
INIS
Size:
Pages: 17
Announcement Date:

Patent:

Citation Formats

Solomon, E E. Ionization detector. France: N. p., 1976. Web.
Solomon, E E. Ionization detector. France.
Solomon, E E. 1976. "Ionization detector." France.
@misc{etde_5989205,
title = {Ionization detector}
author = {Solomon, E E}
abstractNote = {This invention concerns a fire detection system making use of a beta source. The ionisation detector includes a first and second chamber respectively comprising a first and second electrode, preferably a plate, with a common electrode separating the first and second chamber. Communication is provided between these chambers through a set of orifices and each chamber also has a set of orifices for communication with the ambient atmosphere. One or both chambers can comprise a particle source, preferably beta. The detector also has an adjustable electrode housed in one of the chambers to regulate the voltage between the fixed electrode of this chamber and the common electrode located between the chambers. The electrodes of the structure are connected to a detection circuit that spots a change in the ionisation current when a fire alarm condition arises. The detection circuit of a new type includes a relaxation oscillator with a programmable unijunction transistor and a light emitting diode.}
place = {France}
year = {1976}
month = {Feb}
}