Results 1 - 10 of 11

• HASARD - An Electromagnetic-Based Proximity Warning System
  12/20/2019 - Safety guidelines, tips, and checklists, Unpublished documents and reports
  This web page details the original development by the NIOSH Office of Mine Safety and Health Research of a novel electromagnetic-based proximity warning (PW) system to warn underground coal miners whenever they get too close to continuous mining machines.
• Measurement of the Influence of Antennas on Radio Signal Propagation in Underground Mines and Tunnels
  10/4/2019 - Peer reviewed journal articles
  This paper reports the influence of antennas on radio signal propagation in tunnels and underground mines.
• Simulation and Measurement of Medium-Frequency Signals Coupling From a Line to a Loop Antenna
  10/1/2016 - Peer reviewed journal articles
  An article which presents the simulation and measurement results of recent NIOSH research aimed at investigating medium frequency coupling between a transmission line and a loop antenna in an underground coal mine.
• Through-the-Earth Communication Antenna Feasibility Demonstration
  11/20/2015 - Contracts and cooperative agreements
  A contract to develop new antenna configurations to improve performance and utility of through-the-earth (TTE) communications systems once deployed in underground coal mines.
• Through-the-earth Communications Technologies Available
  8/18/2015 - News and announcements
  A feature story about through-the-earth communcations technologies available for mine emergencies.
• Technology News 547 - Cost-Effective, Off-the-Shelf Wireless Links for Surface Integrated Mine Emergency Communications
  12/1/2011 - Technology News
  A surface network system using off-the-shelf components successfully established strategic communications links in a limited mine-simulated environment. The system could be expanded to link other communication devices and a command center.
• Recent National Institute for Occupational Safety and Health Research Using Ground Penetrating Radar for Detection of Mine Voids
  7/1/2003 - Conference papers
  This study indicates that it may be possible to use ground penetrating radar (GPR) for initial underground mine studies followed by directional drilling to accurately delineate the extent and position of adjacent abandoned mine workings.
• One-Way Fire Warning Alarm System for Underground Mines
  7/1/1990 - Conference papers
  An ideal fire warning alarm system for underground mines would be low cost, convenient, fast, reliable, and able to warn all underground workers. The U.S. Bureau of Mine devised a one way communication system employs a large loop antenna and transmitter...
• The Implementation of UHF Radio Communications and CCTV Monitoring Systems in a Room and Pillar Metal/Non-metal Mine
  3/1/1981 - Contract reports
  This report describes the design and implementation of UHF radio and closed-circuit television systems in the Black River room and pillar limestone mine near Butler, Pendleton County, Kentucky.
• Antenna Design & Coupling Studies at Medium Frequency for lmproved Coal Mine Communications
  9/1/1978 - Contract reports
  This report covers antenna design, analysis, and development work suited for use with a wireless radio communication system operating at medium frequency. The work includes the test and evaluation of prototype vehicular antennas developed during the pro...