Principles of Ionization Smoke Detection: Development of a New Sensor for Combustion-Generated Submicrometer Particulates

Details

• Personal Author:
  Hertzberg, Martin ; Litton, Charles D.
• Description:
  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. [Description provided by NIOSH]
• Content Notes:
  in NTRL, no pdf
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Conference Publications ; Case Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-21
• NIOSHTIC Number:
  nn:10000360
• NTIS Accession Number:
  PB271920
• Citation:
  NTIS: PB 271 920; :1-21
• Federal Fiscal Year:
  1977
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:5829ec3f7dc82554db384f45e2e2a34cebb8a993f2b9cf4ab2b72cbbfde43c9cc714f04a69146a44279f8fd1be7368fc2dd83556ae1016b8e253f8c3711e67ab
• Download URL:
  https://stacks.cdc.gov/view/cdc/237755/cdc_237755_DS1.pdf
• File Type:
  [PDF - 1.63 MB ]