Welcome to CDC Stacks | Performance Evaluation of Electromagnetic Techniques for the Location of Trapped Miners - RI 8711 - 9618 | National Institute for Occupational Safety and Health
Stacks Logo
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
 
 
Help
Clear All Simple Search
Advanced Search
Performance Evaluation of Electromagnetic Techniques for the Location of Trapped Miners - RI 8711
  • Published Date:
    1/1/1982
Filetype[PDF - 1.67 MB]


Details:
  • Personal Authors:
  • Description:
    The Bureau of Mines has conducted field studies in coal mines through- out the United States to determine the effectiveness of electromagnetic techniques in locating miners trapped underground following a mine accident. Data from these tests have been used to generate models of expected signal and noise distributions as found above mines throughout the coalfields. These distributions have aided in placing the expected performance of a through-the-earth electromagnetic communications technique into a probabilistic framework. Results show that at a 10-pct false alarm rate, the expected probability of detecting a miner's signal from a depth of 1,000 ft is 54 pct; at 500 ft it is 95 pct. These depths exceed the actual depths of 90 pct and 50 pct, respectively, of U.S. coal mines. Sensitivity studies have shown that at a depth of 1,000 ft, for every 3 db of improvement in signal-to-noise ratio, the probability of detection increases 6 to 8 pct.

  • Supporting Files:
    No Additional Files
No Related Documents.
You May Also Like: