Shielding for seismic cables

Details Shielding for seismic cables Shielding for seismic cables

1989-01-12

1990-09-18

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

174115, 367 13, H01B 1106

Patent

active

049583336

ABSTRACT:
Seismic cable shielding method and apparatus. Shielding is obtained by switching unused wire pairs to ground via a roll-along switch which is connected to system ground. Grounding of the unused conductors in the cable is accomplished by ground connections at the roll-along switch. By grounding the unused conductor pairs (all pairs except those required for the sensor signals) within the cable, partial shielding is provided between the active wire pairs and cross-talk is reduced to a negligible level. Additional wire pairs are hardwired to system ground and distributed uniformly throughout the cable cross section to form an interstitial shield.

REFERENCES:
patent: 3023267 (1962-02-01), Rubenstein et al.
patent: 3622683 (1971-11-01), Roberts et al.
patent: 3673315 (1972-06-01), Lasley
patent: 3816644 (1974-06-01), Giffel et al.
patent: 3829603 (1974-08-01), Hansen et al.
patent: 4188080 (1980-02-01), Streble
patent: 4491939 (1985-01-01), Carpenter
patent: 4636998 (1987-01-01), Greene et al.
patent: 4847443 (1989-07-01), Basconi

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