Communications: electrical – Selective – Having electron beam device
Patent
1977-07-27
1979-03-27
Birmiel, Howard A.
Communications: electrical
Selective
Having electron beam device
340 155MC, 174 70R, G01V 122
Patent
active
041468724
ABSTRACT:
The method and apparatus of the present invention are described in which connection (and disconnection) of a plurality of geophones associated with a digital seismic data acquisition system is greatly simplified without sacrificing flexibility as to the number of geophone flyers per station or the interval spacing per station and also without the addition of separate subcabling in the internal linkage of the flyers to the field digitizing equipment. The apparatus includes a multiple-phone flyer-jumper connected to each channel of a remote data acquisition and telemetering circuit (RDATC). Each RDATC acts in combination with a group of geophone flyers, say four, to store, amplify, filter, gain control and digitize analog data from the flyers and then telemeter the data to recording circuitry in the field truck. In accordance with the present invention, each jumper-flyer includes a central multi-conductor cable segment terminating at each of its ends in the central leg of a multi-armed connector. A plurlaity of series/parallel connected geophones, say 9 in number are used in combination with the central segment. At the end of the arms of each multi-armed connector pass another conductor cable segment (similar to the central segment, but called the "branch cable segment") in which only two of the cables are actively connected to the selected conductor pairs of the central segment. At the other end of each branch cable is a two pin-two recepticle hermaphroditic connector.
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patent: 3956575 (1976-05-01), Sutherland
patent: 3986008 (1976-10-01), Fort et al.
patent: 4052694 (1977-10-01), Fredriksson
Birmiel Howard A.
Chevron Research Company
Freeland, Jr. R. L.
Messner H. D.
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