Communications: electrical – Continuously variable indicating – With meter reading
Patent
1981-12-15
1985-01-22
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082549, 340941, H04Q 900, G08G 101
Patent
active
044954964
ABSTRACT:
A personnel monitoring and locating system is disclosed that is particularly well suited for monitoring and/or locating underground miners. A plurality of remote terminals having transceivers associated therewith are positioned in a mine and periodically are caused to transmit interrogation signals. Each miner to be monitored is equipped with a transponder that replies to the interrogation signal with the reply signal being timewise delayed by a predetermined amount of time that is different for each of the transponders in use so that the reply from each transponder is timewise spaced from every other interrogated transponder. A host computer at the surface is linked to each remote terminal for transmission of information with information from the remote terminal being indicative of the location of each transponder equipped miner. The transponder carried by each miner is powered by the battery normally carried by the miner for powering a lamp, and the cord extending between the battery and the lamp is utilized by the transponder as a transmitting and receiving antenna.
REFERENCES:
patent: 3898619 (1975-08-01), Carsten et al.
patent: 3922636 (1975-11-01), Jaureguy et al.
patent: 4053714 (1977-10-01), Long
patent: 4083003 (1978-04-01), Haemming
patent: 4107689 (1978-08-01), Jellinek
patent: 4224596 (1980-09-01), Knickel
patent: 4274083 (1981-06-01), Tomoeda
Johnson Engineering Corp.
Yusko Donald J.
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