公开(公告)号：US20040004479A1

公开(公告)日：2004-01-08

申请号：US10609504

申请日：2003-07-01

申请人： Radiodetection Limited,

发明人： David William Flatt ,  Stephen John Petherick ,  Robert Ashworth Worsley

IPC分类号： G01V003/08

CPC分类号： C23F13/04 ,  G01N17/02

摘要： Cathodic protection voltages are used to resist the damage to pipes or cables from electrolytic effects. However, localised fields can lead to stray currents and may result in corrosion and it is therefore desirable to detect and analyse those stray currents. Frequently there are several pipes in the area of interest and so it is necessary to distinguish between those pipes. Therefore the cathodic voltage on the pipes is modulated, with different pipes having different modulations. This modulation may be applied using an interrupter. Orthogonal modulations with non-unitary aspect ratios improve the discrimination between the pipes whilst maximising the energy content of the modulation pattern. The analysis is improved when the interrupters are synchronised with each other and so repeating on the same time-base. This synchronisation may be achieved using an external time signal such as GPS. An interrupter which can be used in this regard is also proposed, and may be powered from the cathodic voltage itself.

摘要翻译： 阴极保护电压用于抵抗管道或电缆对电解效应的损害。 然而，局部场地可能导致杂散电流并且可能导致腐蚀，因此希望检测和分析那些杂散电流。 通常在感兴趣的区域有几条管道，因此有必要区分这些管道。 因此，管道上的阴极电压被调制，不同的管道具有不同的调制。 可以使用中断器来应用该调制。 具有非单位宽高比的正交调制改善了管道之间的区别，同时使调制图案的能量含量最大化。 当断路器彼此同步并且在相同的时基上重复时，分析得到改善。 可以使用诸如GPS的外部时间信号来实现该同步。 还提出了可以在这方面使用的中断器，并且可以由阴极电压本身供电。