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Principles of Ionization Smoke Detection. Development of a New Sensor for Combustion-generated Submicrometer Particulates.

Authors
Litton-CD; Hertzberg-M
Source
NTIS: PB 271 920 :21 pages
Link
NIOSHTIC No.
10000360
Abstract
A new prototype ionization-attachment fire detector was developed by the Bureau of Mines for detecting combustion-generated submicrometer particulates. It is much more sensitive than the conventional ionization smoke detector, and it has the following added features: 1. A primary charging current of unipolar air ions is generated by a gold-coated, radioactive center electrode of a cylindrical diode. 2. Submicrometer particulates are flowed axially through the unipolar cloud where they acquire charge. The charged particles impinge upon a third electrode, located downstream, resulting in a current which is directly proportional to the particulate concentration. 3. Additional electrodes analyze the particulates in terms of their mobility and thus determine their size distribution. 4. A filter and cyclone assembly protects the ionization chamber against ambient dust. An analysis of conventional ionization smoke detector performance is also presented in terms of source strength, chamber geometry, and applied potential.
Publication Date
19770101
Document Type
IH; Report of Investigations
Fiscal Year
1977
NTIS Accession No.
PB-271920
NTIS Price
A03
Identifying No.
RI-8242
NIOSH Division
PRC;
Source Name
NTIS: PB 271 920
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