Mining Publication: Development of a Visual Display and Control System
Original creation date: October 1980
Authors: Arthur D. Little, Inc.
The object of this program was to extend the capabilities of visual paging systems both in size and functions in mines. The system developed uses the mine pager phone line for communication, monitoring, and remote control. A central station, using a minicomputer, transmits signals by phase inversion modulation of a 16,384-hz carrier to as many as 999 remote units. The remote unit addressed returns an echo to indicate that it is functioning and, in the case of monitor units, to convey the monitor data. Magnetically latched display disks, which can be seen from both sides when posted, are used for visual paging. Lists of the addresses of posted pages, unanswered pages, and nonechoing units are prepared by the central station computer. The system was designed to be intrinsically safe and should operate for 3 months on a 12-volt lantern battery.
- Control and Monitoring Via Medium Frequency Techniques and Existing Mine Conductors
- Experience with an Integrated, Computer-Controlled Communications and Monitoring System at the Robena Mine
- The Implementation of UHF Radio Communications and CCTV Monitoring Systems in a Room and Pillar Metal/Non-metal Mine
- Propagation of EM Signals in Underground Metal/Non-Metal Mines
- Propagation of EM Signals in Underground Mines
- Technical Bulletin Pager Phones: Circuit Protection
- Technical Bulletin Pager Phones: Installation
- Technical Services for Mine Communications Research: Task A, Task Order No. 1 - Applicability of State-Of-The-Art Voice Bandwidth Compression Techniques for Wireless Mine Communication
- Theory on the Propagation of UHF Radio Waves in Coal Mine Tunnels
- U.S. Bureau of Mines New Developments in Mine Communications