G - Physics – 01 – V
Patent
G - Physics
01
V
349/10, 349/9
G01V 1/22 (2006.01) G01V 1/20 (2006.01) G01V 1/38 (2006.01) H04J 3/04 (2006.01) H04J 3/10 (2006.01)
Patent
CA 1052900
MULTICHANNEL SEISMIC TELEMETER SYSTEM AND ARRAY FORMER ABSTRACT OF THE DISCLOSURE It is a purpose of this invention to dispose a large number, such as 500, of elemental seismic sensor units over the earth's surface in a desired pattern. The sensors are arranged preferably in a linear pattern, at increasing distances, remote- ly with respect to a central station. Each elemental seismic sensor unit comprises a short subarray consisting of three seis- mic detectors, electrically interconnected. Each elemental sen- sor unit is a separate source of seismic signals. At regular in- tervals the analog seismic signals from the elemental sensor units are sampled in sequence and are digitized as a 20-bit binary num- ber. The binary numbers are representative of the analog signal levels. The binary numbers are encoded in a self-clocking re- turn-to-zero pulse code as digital data words. The data words from the respective elemental sensor units are time-delay multi- plexed into a wide band transmission channel for transmission to the central station in a constant current mode. Spaced along the transmission link are a series of transceiver units to each of which several separate sensor units are connected. The trans- ceiver units are connected in series and include a repeater net- work which receives and retransmits data words from down-link transceivers, as well as data words derived from each of the locally- connected sensor units. Each repeater network also includes a word detection circuit, a local clock, and synchronizing circuitry In the central station, the respective data words are stored as a matrix, in a core memory in sequential order. A formatter ex- tracts from the core memory, data words that originates from se- lected groups of the elemental subarrays. The data words are com- bined to form new composite data words representative of seismic signals originating from desired longer arrays. The composite data words are transferred to a recording medium, such as a magnetic tape, for storage or future use.
252005
Morgan Paul M.
Siems Lee E.
LandOfFree
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