| 摘要 |
<p>A first embodiment of a detection apparatus arranged to detect defects within a flexible pipe body comprises a signal generator, a receiver, a correlator and a 5 processor. The signal generator is arranged to couple to first and second electrically conductive members extending at least partially along the length of a flexible pipe and electrically isolated from one another to form an electrical transmission line, the signal generator being 10 arranged to generate an electrical test signal and to apply the test signal between the first and second electrically conductive members, the test signal comprising a pulse code modulated electrical signal. The receiver is arranged to couple to the first and second 15 electrically conductive members and to receive an electrical return signal comprising a reflection of the test signal. The correlator is arranged to correlate the test signal with the return signal and to determine a correlation signal. The processor is arranged to detect 20 variation of the correlation signal, and to determine if a detected variation is indicative of a pipe defect. A second embodiment of a detection apparatus arranged to detect defects within a flexible pipe at least partially surrounded by seawater comprises an impedance monitor and 25 a processor. The impedance monitor is arranged to measure the impedance between an electrically conductive member extending at least partially along the length of a flexible pipe and a seawater electrode in contact with seawater surrounding at least part of the flexible pipe in 30 response to an electrical test signal applied to the electrically conductive member at first and second frequencies. The processor is arranged to detect 4545356_1 (GHMatters) P94434.AU 26/07/13 variation of the measured impedance for an electrical test signal at a first frequency, and if a variation of the measured impedance is detected, to determine if the variation is indicative of a pipe defect, and if so to 5 determine the distance from the seawater electrode to a pipe defect by comparison of the measured impedances at the first and second frequencies. Methods of detecting defects within a flexible pipe body, a pipeline apparatus and methods of forming pipeline apparatuses are also 10 disclosed. Figure 3 and Figure 5. 4545358_1 (OHMatters) P94434.AU 26/07/13 Transmitter 30 30Correlator Processor L------------...</p> |
