Ion detector. [alpha radiometric fire alarm system]

Patent · Tue Apr 04 04:00:00 EST 1978

OSTI ID:7054954

Depoitier, J; Vinchent, R

Axially aligned conductive metal cylindrical members on opposite sides of a printed circuit plate define a first measuring chamber and a second reference chamber on opposite sides thereof. The bottom of one cylindrical member forms the first electrode of the reference chamber and a plate closing off the end of the measuring chamber remote from the printed circuit plate forms the first electrode of the measuring chamber. Radioactive sources are mounted to the first electrode of respective chambers and a rod projects through the printed circuit plate coaxial with the first and second cylindrical members and terminates short of the plate closing off the first chamber and the bottom of the second chamber cylindrical member, the second electrodes for the chambers mounted respectively at the ends of the rod, and wherein the second electrode of the first chamber comprises a flat apertured portion in parallel with the plate overlying the end of the first cylindrical member remote from the printed circuit plate with the first cylindrical member plate defining a flat surface. The detector can be used in fire alarms. 7 claims, 4 figures.

• Assignee: Institut National des Radio-elements-Nationaal Instituut vor Radio-elementen en abrege
• Patent Number(s): US 4082952
• OSTI ID: 7054954
• Country of Publication: United States
• Language: English

Related Subjects

440105* -- Radiation Instrumentation-- Radiometric Instruments-- (-1987)
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
AEROSOLS
ALARM SYSTEMS
ALPHA SOURCES
CHARGED PARTICLE DETECTION
COLLOIDS
DESIGN
DISPERSIONS
ELECTRODES
FIRES
ION DETECTION
ION SOURCES
IONIZATION CHAMBERS
MEASURING INSTRUMENTS
PARTICLE SOURCES
RADIATION DETECTION
RADIATION DETECTORS
RADIATION SOURCES
RADIOMETRIC GAGES
RESIDUES
SMOKES
SOLS