Details:

Personal Author:
Curry, F. B. ; Moore, T. C. ; Rorden, L. H. ; Schleicher, I. D.
Curry, F. B. ; Moore, T. C. ; Rorden, L. H. ; Schleicher, I. D. Less -
Corporate Authors:
United States. Bureau of Mines. ; DEVELCO, Inc.
United States. Bureau of Mines. ; DEVELCO, Inc. Less -
Description:
The purpose of this program is to extend electromagnetic (EM) techniques for use in locating miners trapped in mines as deep as 1000 m. A previously developed EM system is considered adequate for use at mines less than 300 m deep where it has a probability of detection of 54%. A system for deep mines must keep underground equipment simple, and use extremely low frequencies (ELF), sensitive receivers, and noise cancellation. The proposed location method, developed by Develco for other applications, is based on vector field measurements from two or more static sensors and computation of source location by iterative techniques. During Phase II, very sensitive search coil sensors were built and used in a separate test to verify the feasibility of atmospheric noise cancellation. A "Breadboard" location system version without cancellation, which is a fieldable test bed to evaluate receiving and location functions, was tested and supplied. Very good results were achieved from the first in-mine test with the transmitter at a depth of 380 m. It is expected the results of this work, and additional evaluation tests in the future, will be used to define the requirements for a prototype operational system.
Subject:
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Electromagnetic Devices.
ELF Electromagnetic Fields.
Mine Rescue Work -- Equipment And Supplies.
Noise Control.
Vector Fields.

Series:
Mining research contract report ; Open file report (United States. Bureau of Mines) ; 45-86
Mining research contract report ; Open file report (United States. Bureau of Mines) ; 45-86 Less -
Document Type:
Report
Funding:
Contract no. J0199009
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
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urn:sha256:39b08c6d1f3ec3edd62e3f5f6a4e5196995bb1dc4afb85fa91131cd16e143991
File Type:

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