Communications: electrical – Wellbore telemetering or control – Using a specific transmission medium
Patent
1988-09-02
1990-11-06
Jordan, Charles T.
Communications: electrical
Wellbore telemetering or control
Using a specific transmission medium
340858, 175 40, 175 50, G01V 100
Patent
active
049689789
ABSTRACT:
A method for remotely monitoring conditions such as carbon monoxide for methane gas concentration, longwall roof support pressure, machine parameters or uncut coal, trona or potash layer thickness in a natural resource mining system such as a longwall or continuous mine system. The method utilizes a plurality of sensors connected to low magnetic moment transmitters, e.g. 0.1 ATM.sup.2, or high magnetic moment transmitters, e.g. 2.5 ATM.sup.2, that transmit collected data during multiple short burst transmission periods. Prior to transmission, the data is converted to a digital word format. An algorithm in the transmitter microcomputer ensures that random time intervals exist between data transmission bursts thus preventing a data transmission clash at the central receiver. A microcomputer algorithm in the central receiver protects against data contention caused by simultaneous transmission from several sensors. The data is transmitted to the central receiver either through a natural waveguide pathway or through a utility conductor that is magnetically coupled to the transmitter and central receiver by properly oriented electrically short magnetic dipole antennas. The method can be used, for example, to automatically control the positioning of a plurality of longwall roof supports or to transmit data from a longwall drillhead, along the drill rod, to the central receiver. Data can be communicated between a remote location and a surface area by utilizing a system of repeaters inductively coupled to a utility conductor. Use of the repeater system permits operation of mining machines from a surface computer.
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Dobroski et al, Control and Monitoring via Medium-Frequency Techniques and Existing Mine Conductors, IEEE Transactions on Industry Applications, vol. IA-21, Jul./Aug. 1985.
Stolarczyk et al, "Long and Short Range Multiple Point Wireless Sensor Data Transmission System", Nov. 7, 1986.
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R. F. Harrington, "Time-Harmonic Electromagnetic Field", McGraw Hill Co., p. 234 (1961).
Eldred J. Woodrow
Jordan Charles T.
Schatzel Thomas E.
Stolar, Inc.
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