Ionization-chamber smoke detector system

Patent · Tue Oct 19 00:00:00 EDT 1976

OSTI ID:862675

Roe, Robert F ^[1]

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1. Jackson, OH

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.

• Research Organization: Goodyear Atomic Corp., Portsmouth, Ohio
• DOE Contract Number: AT(33-2)-1
• Assignee: United States of America as represented by United States Energy (Washington, DC)
• Patent Number(s): US 3987423
• Application Number: 05/643,466
• OSTI ID: 862675
• Country of Publication: United States
• Language: English

Related Subjects

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/