Due to the inability of microwave physical ground penetrating radar to detect plastic pipes, which poses obstacles for future maintenance and other construction, metal wires are attached to the plastic pipes to provide response signs.

銅包鋼是由鋼芯線和緊密包覆其外的銅層構成金屬芯，非常外側為PE防腐層，銅起到傳導弱電信號的作用，鋼絲則起到支撐作用。銅芯電線一般由非常內層的銅芯線、中間層的絕緣包皮和非常外層的保護外皮組成。銅包鋁由鋁芯線和緊密包覆其外的銅層構成金屬芯，非常外層為PE防腐層。

Copper clad steel is a metal core composed of a steel core wire and a tightly wrapped copper layer, with a PE anti-corrosion layer on the outermost side. Copper plays a role in conducting weak electrical signals, while steel wire plays a supporting role. Copper core wires are generally composed of the innermost copper core wire, the insulation sheath of the middle layer, and the protective sheath of the outermost layer. Copper clad aluminum consists of an aluminum core wire and a copper layer tightly wrapped around it to form a metal core, with the outermost layer being a PE anti-corrosion layer.

由于鋼質燃氣管道非常外層的防腐層為具有絕緣、防腐性能的塑料層或涂層，與銅包鋼、銅芯電線、銅包鋁等非常外層也為具有絕緣、防腐性能的塑料層結構相似。因此，我們將兩者等效，通過采用PCM管道電流衰減率法[1]，對示蹤線防腐層平均絕緣質量進行檢測。檢測原理是向示蹤線施加某一頻率的電流信號，電流由示蹤線向遠方傳遞時會逐漸衰減。其衰減大小與示蹤線的塑料層的絕緣電阻率有關，示蹤線塑料層的平均絕緣電阻率越高，電流衰減就越慢，反之則衰減越快。

Due to the fact that the outermost anti-corrosion layer of steel gas pipelines is a plastic layer or coating with insulation and anti-corrosion properties, similar in structure to the outermost plastic layer with insulation and anti-corrosion properties, such as copper clad steel, copper core wires, and copper clad aluminum. Therefore, we equate the two and use the PCM pipeline current decay rate method [1] to detect the average insulation quality of the trace line anti-corrosion layer. The detection principle is to apply a current signal of a certain frequency to the tracer line, and the current will gradually decay when transmitted from the tracer line to the distance. The magnitude of its attenuation is related to the insulation resistivity of the plastic layer of the tracer line. The higher the average insulation resistivity of the plastic layer of the tracer line, the slower the current attenuation, and vice versa, the faster the attenuation.

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