FORFARANDE OCH ANLEGGNING FOR SEISMISK DATATELEMETRI

摘要

In geophysical prospecting the seismic data is obtained by reflection from surfaces to detectors. A number of detectors are mounted in a long cable and their output data is multiplexed for application to a central processing station. Reflected seismic waves (30, 35, 36) are received at detectors (21) in sections of seismic cable (12, 20). Intermediate sections (13) contain transmission reception units which permit signals received by the detectors to be transmitted to a central station on board ship (10). The detector output signals are sampled by one multiplexing stage and the output signals from the transmission reception units are multiplexed for sequential transmission to the central station when interrogation signals are received.