Communications: electrical – Selective – Having electron beam device
Patent
1976-11-08
1978-01-03
Birmiel, Howard A.
Communications: electrical
Selective
Having electron beam device
340 17R, 325 28, 179 82, 343719, G01V 122, G01V 102
Patent
active
040669939
ABSTRACT:
A seismic exploration system includes a recording vehicle having a seismic cable connected thereto and one or more vibrator units. The seismic sensor cable includes at least one unterminated conductor. Operation of the vibrator units is programmed by transmitting, at very low frequency (VLF), a frequency-modulated, coded control-signal from the recording vehicle into the unterminated conductor. The conductor, acting as a VLF antenna, radiates a weak electrostatic E-field. A ferrite-core loop antenna on the vibrator unit detects the coded control signal, thereby to initiate the required vibrator operation. If desired, a reproduction of the seismic signal generated by the vibrator can be transmitted back to the recording truck over the same VLF radio link.
REFERENCES:
patent: 3543262 (1970-11-01), Hutton
patent: 3585505 (1971-06-01), Ogilvy
patent: 3735265 (1973-05-01), Karaganis
patent: 3760278 (1973-09-01), Narbaits-Jaureguy et al.
patent: 3896380 (1975-07-01), Martin
patent: 3900825 (1975-08-01), Hinnant
patent: 4012662 (1977-03-01), Martin
Birmiel Howard A.
Knox William A.
Western Geophysical Company of America
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