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(tong)包鋼是(shi)由鋼芯線(xian)和(he)緊密包(bao)覆其外的(de)銅層(ceng)構(gou)成金(jin)屬芯(xin)，外側為PE防(fang)腐層(ceng)，銅(tong)起(qi)到(dao)傳導弱(ruo)電信(xin)號的(de)作用，鋼絲則起(qi)到(dao)支(zhi)撐(cheng)作用。銅芯(xin)電線(xian)壹(yi)般(ban)由內層(ceng)的(de)銅芯(xin)線(xian)、中間(jian)層(ceng)的(de)絕(jue)緣(yuan)包(bao)皮(pi)和(he)外層(ceng)的(de)保(bao)護(hu)外皮組成。銅(tong)包鋁由鋁芯線(xian)和(he)緊密包(bao)覆其外的(de)銅層(ceng)構(gou)成金(jin)屬芯(xin)，外層(ceng)為(wei)PE防(fang)腐層(ceng)。

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.

由於鋼質燃氣管(guan)道外層(ceng)的(de)防(fang)腐層(ceng)為(wei)具有絕(jue)緣(yuan)、防(fang)腐性(xing)能(neng)的(de)塑料(liao)層(ceng)或(huo)塗層(ceng)，與(yu)銅包鋼、銅芯電線(xian)、銅包(bao)鋁等外層(ceng)也為(wei)具(ju)有絕(jue)緣(yuan)、防(fang)腐性(xing)能(neng)的(de)塑料(liao)層(ceng)結構(gou)相(xiang)似(si)。因(yin)此，我們將(jiang)兩(liang)者等(deng)效(xiao)，通(tong)過采(cai)用PCM管(guan)道電流(liu)衰(shuai)減(jian)率(lv)法(fa)[1]，對示(shi)蹤(zong)線(xian)防(fang)腐層(ceng)平均(jun)絕(jue)緣(yuan)質量(liang)進(jin)行(xing)檢測。檢測原理是(shi)向(xiang)示(shi)蹤(zong)線(xian)施加(jia)某(mou)壹(yi)頻(pin)率的(de)電流(liu)信(xin)號，電流(liu)由示(shi)蹤(zong)線(xian)向(xiang)遠方(fang)傳遞時會(hui)逐漸衰(shuai)減(jian)。其衰(shuai)減(jian)大小(xiao)與示(shi)蹤(zong)線(xian)的(de)塑料(liao)層(ceng)的(de)絕(jue)緣(yuan)電阻(zu)率(lv)有關，示(shi)蹤(zong)線(xian)塑料(liao)層(ceng)的(de)平均(jun)絕(jue)緣(yuan)電阻(zu)率(lv)越(yue)高(gao)，電流(liu)衰(shuai)減(jian)就越慢(man)，反之(zhi)則衰(shuai)減(jian)越(yue)快(kuai)。

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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