Communications: electrical – Selective – Having electron beam device
Patent
1977-04-13
1978-09-26
Birmiel, Howard A.
Communications: electrical
Selective
Having electron beam device
179 15AL, 179 15BL, 340152T, G01V 122
Patent
active
041174488
ABSTRACT:
The telemetric system consists of a large number of identical cable sections laid over the ground end-to-end, in a long array or "spread". The cables have a number of external connectors along their length for connecting geophone groups. The cables are electrically and physically interconnected by a like number of data transceiver modules. The data transceiver modules contain circuitry to receive and process data from the various geophone groups. A recording and control unit is connected to the spread at some convenient accessible location. The recording and control unit transmits control signals to the respective data transceiver modules. In response to the control signals, the respective modules transmit digital seismic signals, back to the recording and control unit. The cable sections and data transceiver modules are not polarized; that is, it is immaterial which end of a cable section is plugged into which side of a transceiver module. The same telemetric link that is used to transmit command and interrogation pulses to the respective transceiver modules is also used to receive digital data words from the respective modules. Accordingly, a direction sense circuit in each module determines the direction of any given module with respect to the recording unit and orders the digital logic contained within the module to electrically "face" the recording unit.
REFERENCES:
patent: 3538498 (1970-11-01), Games et al.
patent: 3805235 (1974-04-01), Foster et al.
patent: 3905010 (1975-09-01), Fitzpatrick
patent: 3986162 (1976-10-01), Cholez et al.
patent: 3996553 (1976-12-01), Siems et al.
patent: 4001769 (1977-01-01), Fort et al.
Birmiel Howard A.
Knox William A.
Western Geophysical Company of America
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