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5/1/2016 - Peer reviewed journal articlesThis article by NIOSH discusses a new, simple radio frequency RF testing system that can be conveniently built and used for measuring radio propagation in tunnels.
3/1/2016 - Peer reviewed journal articlesThis article from NIOSH reports measurement results for radio frequency RF propagation around 90-degree corners in tunnels and underground mines, for vertically, horizontally, and longitudinally polarized signals.
Application of Radio-Frequency Identification Systems to Collision Avoidance in Metal/Nonmetal Mines1/1/2001 - Peer reviewed journal articlesNew developments in radio frequency identification (RFID) systems show promise for reducing the number of collisions in mines. This paper describes tests conducted on off-the-shelf RFID systems and the subsequent development of a custom RFID system.