Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent
1978-05-15
1980-08-26
Blum, Theodore M.
Communications: electrical
Wellbore telemetering or control
Selective control of subsurface equipment
340861, G01V 100
Patent
active
042198100
ABSTRACT:
A seismic telemetry system employing frequency division multiplexing techniques is disclosed. Analog seismic data are received by remote data acquisition units (RDAU's) converted to digital form and stored in the RDAU's. The data are transmitted via a transmission line to a central station for recording. The RDAU's are connected at randomly selectable locations along the transmission line. Either an RF command or digital strobe signal is used to interrogate the RDAU's from the central station. Each RDAU responds on a separate RF carrier frequency, modulated by the previously stored digital data. The data from each RDAU, therefore, need not be separated along the transmission line from the data received from other RDAU's. At a central station, the data signals are demultiplexed and recorded. Use of high-impedance transmitters and receivers permits the transmission line to operate in flat-line mode. Elimination of the previous requirements for data separation along the line permits significantly increased data rates to be handled.
REFERENCES:
patent: Re23919 (1955-01-01), Hawkins
patent: 3134957 (1964-05-01), Foote et al.
patent: 3212598 (1965-10-01), Anderson
patent: 3748638 (1973-07-01), Montgomery, Jr. et al.
patent: 3958216 (1976-05-01), Chapman
Blum Theodore M.
Globe Universal Sciences, Inc.
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