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Method and apparatus for detecting the location of a marine pipeline or cable, whereby acoustic pulses are transmitted by a submarine pulse transmitter carried by a vessel. These pulses, as well as the reflections of the pulses on the seabottom and on the pipeline or cable are detected by means of t

Method and apparatus for detecting the location of a marine pipeline or cable, whereby acoustic pulses are transmitted by a submarine pulse transmitter carried by a vessel. These pulses, as well as the reflections of the pulses on the seabottom and on the pipeline or cable are detected by means of two detectors that are carried by two paravanes towed by the vessel. The signals received by the detectors are combined and the record of the combined signals is displayed. The signal parts that are representative of the acoustic waves reflected by the pipeline are identified in the record by separate colors or various intensities of a single color.

대표청구항 ▼

Method for detecting the location of a marine pipeline or a cable by means of a sequence of acoustic wave pulses received by a first and a second submarine wave receiving means situated at substantially equal depth below the water level and generated by submarine wave transmitting means symmetricall

Method for detecting the location of a marine pipeline or a cable by means of a sequence of acoustic wave pulses received by a first and a second submarine wave receiving means situated at substantially equal depth below the water level and generated by submarine wave transmitting means symmetrically arranged with respect to the plane of symmetry of said first and said second wave receiving means, wherein said wave pulses pass from said transmitting means to said first and said second receiving means directly as well as indirectly, by being reflected by submarine bottom layers and by said pipeline or said cable, said method comprising the steps of: obtaining after each transmittal of an acoustic pulse a first and a second signal as a function of time of the amplitudes of said acoustic waves received by said first and said second receiving means, respectively, said first and said second signal forming a pair of signals, each signal of said pair of signals including a first part representing the wave pulse reflections by said pipeline, and both signals of a pair further including second parts substantially identical to each other and representing direct wave pulses and wave pulse reflections other than those originating from said pipeline; combining the signals of each pair and displaying a separate record of said combined signals; distinguishing in said separate record of said combined signals said first parts from each other as well as from said substantially identical second parts when said pipeline or cable is outside the plane of symmetry; and, displaying said separate records in the same sequence as the sequence of the transmitted acoustic pulses from which they originate.