System for communicating location of survivors in mine emergencies
US7843768B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Apr 11, 2008 |
| Grant date | Nov 30, 2010 |
| Priority date | — |
| Expiry date | Jul 26, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/034
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The disclosed system uses seismic signaling to locate survivors in a mine collapse. A separate transmitter with a specific pre-selected frequency or frequencies is placed in pre-positioned safety zones of a mine. The system generates frequency-locked, unmodulated seismic energy, which allows rescuers to identify the safety zone where a transmitter is activated. The transmitter comprises an oscillator that generates the signal. The oscillator drives the transducer. The transducer causes the inertial mass to move. The movement of the inertial mass generates the seismic waves, which are conducted through the pressure plate to the earth. The seismic signal is detected then amplified, filtered, converted and then processed. The use of a continuous signal enables the processing unit to identify the frequency of the signal with a very low error rate, using frequency content identification. The disclosure also describes a method for transmitting seismic waves through the earth using the above described system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.