Ionization detector
Patent
·
OSTI ID:6506127
An ionization detecting fire alarm device is disclosed which comprises a double chamber structure, a source disposed in at least one of the chambers, and a vernier adjusting screw electrode protruding into one chamber. The chamber containing the adjustable electrode is more open to the atmosphere than the other chamber. Porting is provided between chambers and detection occurs by sensing the rate of change of ionization current in the chamber structure. The source or sources, one being in each chamber, is a beta source such as a nickel 63 source. A change in ionization current is detected by a unique circuit of this invention which comprises a programmable unijunction transistor oscillator circuit.
- Assignee:
- Gamewell Corp.
- Patent Number(s):
- US 4121105
- OSTI ID:
- 6506127
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DESIGN
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
IONIZATION CHAMBERS
ISOTOPES
MEASURING INSTRUMENTS
NICKEL 63
NICKEL ISOTOPES
NUCLEI
RADIATION DETECTORS
RADIOISOTOPES
SMOKE DETECTORS
YEARS LIVING RADIOISOTOPES
47 OTHER INSTRUMENTATION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DESIGN
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
IONIZATION CHAMBERS
ISOTOPES
MEASURING INSTRUMENTS
NICKEL 63
NICKEL ISOTOPES
NUCLEI
RADIATION DETECTORS
RADIOISOTOPES
SMOKE DETECTORS
YEARS LIVING RADIOISOTOPES