EM rescue (location) system for deep mines. Phase II-build and test breadboard equipment.
Curry-FB; Moore-TC; Rorden-LH; Schleicher-ID
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, J0199009, 1984 Oct; :1-109
The purpose of this program is to extend electromagnetic (em) techniques for use in locating miners trapped in mines as deep as 1,000 m. A previously developed em system is considered adequate for use in 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 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.
OP; Final Contract Report
NTIS Accession No.
OFR 45-86; Contract-J0199009
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, J0199009