Communications: electrical – Selective – Having electron beam device
Patent
1973-10-29
1978-04-25
Birmiel, Howard A.
Communications: electrical
Selective
Having electron beam device
340152T, 340167R, 343 65R, 325 65, G01V 122
Patent
active
040865045
ABSTRACT:
In operations such as seismic exploration seismic waves are generated at a shot point. The amplitudes of successive samples of seismic waves appearing at a plurality of detector stations variously spaced from said shot point in the wake of generation thereof are converted to digital codes. The codes from all the detectors are transmitted in sequence and on a real time basis by spread spectrum radio pulses to a master station.
A plurality of data acquisition units each including a radio transponder and a seismic detector are located at each of a plurality of spaced seismic detector stations in a seismic prospect. A master radio station means is located in or adjacent to the prospect. Means in the acquisition units and in the master station means interrogates and sequentially polls the transponder units in real time to secure and store digital samples at the master station of analog signals from the detectors at a fixed sample interval the duration of which is selected in relation to the frequencies of the signals whereby samples portray the time amplitude variations of the signals.
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Davis, Jr. Paul D.
Ezell George D.
Murphy, Jr. Marvin L.
Birmiel Howard A.
Comfort James T.
Devine Thomas G.
Grossman Rene E.
Texas Instruments Incorporated
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