Results 11 - 20 of 27

• A Miniature Data Acquisition System with LED Warning Lights
  9/1/2003 - Conference papers
  Researchers have developed a miniature data acquisition system (MIDAS) that can measure resistance changes and temperature, store data for later retrieval, and illuminate LED lights. This instrument can be used with strain-gaged bolts, cable bolts, CSIR...
• Hazards in Motion
  1/1/2001 - NIOSH/USBM numbered publications, Videos and multimedia
  The Hazards In Motion video teaches mobile equipment safety for underground miners.
• Technology News 484 - Devices to Monitor Blind Spots Near Large Haulage Equipment
  1/1/2001 - Technology News
  CDC/NIOSH Technology News brief on several technologies available to monitor the blind spots of large haulage equipment.
• Evaluation of a Signaling and Warning System for Underground Mines
  5/1/1997 - Reports of Investigations
  A report evaluating a wireless signaling and warning system for underground mines applicable to both coal and non-coal mines. A TeleMagnetic Signalling Systems wireless ultra-low-frequency electromagnetic signaling system was installed and tested.
• A Spatial/Spectral Domain Microwave Coal Seam Imaging Sensor-Progress in Signal Processing
  7/1/1994 - Conference papers
  The paper, presents the results of roof coal thickness measurements in underground mines and rib coal thickness measurements in highwall mines. The microwave sensor described uses a unique spatial modulation scheme created by antenna motion, along with ...
• Control and Monitoring Via Medium Frequency Techniques and Existing Mine Conductors
  7/1/1985 - Peer reviewed journal articles
  Medium frequency (MF) techniques have been successfully applied to the problem of radio voice communications in both coal and metal and nonmetal mines. MF techniques can also be applied to the areas of in-mine control and monitoring. Preliminary work in...
• Electromagnetic Detection of Trapped Miners
  2/1/1984 - Peer reviewed journal articles
  The Bureau of Mines has conducted field studies in coal mines throughout the United States to determine the effectiveness of electromagnetic techniques in locating miners trapped underground following a mine accident.
• Development of a Phase Difference of Arrival Technique for Location of Trapped Miners
  9/1/1983 - Open File Reports
  Current technologies for locating trapped miners from the surface are either simple direction finders or time difference pulse systems that have accuracy limitations. Developing technologies using full-vector field measurements at several receiving poin...
• A Feasibility Study for the Detection of Weak Electromagnetic Signal/ Bursts With Hard-Limited Arrays
  11/1/1981 - Contract reports
  A prototype detector using electromagnetic signals for finding trapped miners has previously been built and tested. The signals are generated from transmitters carried on the miner's belt and powered by his head lamp battery and the receiver is a human ...
• Propagation of EM Signals in Underground Metal/Non-Metal Mines: Magma Copper Company - San Manuel Mine
  4/1/1981 - Contract reports
  This report presents test results, data evaluations, and typical system performance expectations based on wireless electromagnetic propagation measurements performed in the MAGMA Copper Company San Manuel mine near Tucson, Arizona during March 30 throug...