Testing of seismic streamers

Details Testing of seismic streamers Testing of seismic streamers

1978-01-26

1979-08-28

Farley, Richard A.

Communications: electrical

Selective

Intelligence comparison for controlling

73 1DV, 340 7R, G01V 1300

Patent

active

041662709

ABSTRACT:
A test circuit is installed in each channel of a seismic streamer towed behind an exploration vessel in offshore seismic exploration. The test circuit is adapted to generate a signal in the channel that is indicative of a characteristic of the channel. The signal is transmitted to the vessel for recording and observation aboard the vessel through the existing cables in streamers used to transmit seismic signals. A signal from onboard the vessel operates switch means which normally disconnect the test circuit and close the primary circuit of the channel to place the test circuit in the primary circuit of the channel. A test circuit is disclosed which includes a relaxation oscillator adapted to indicate the current leakage resistance of the primary circuit of the channel by changes in the frequency of the oscillator and means for applying a step voltage to the primary circuit and indicating the response of the primary circuit of the channel to the step voltage. All of the channels in the streamer can be tested simultaneously and the characteristics of each channel recorded on the vessel.

REFERENCES:
patent: 2918651 (1959-12-01), Podolak et al.
patent: 3659255 (1972-04-01), Trott
patent: 3864664 (1975-02-01), Trott et al.

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