Abstract: The Close interval potential survey (CIPS) has a good detection effect on the cathodic protection potential distribution and cathodic protection situation of petroleum and natural gas steel transmission pipelines. However, due to the poor contact between the CIPS probe and the soil and the influence of stray currents, there is significant interference on the on/off potential in CIPS detection in dry sandy areas and areas with severe stray currents. It is difficult to determine the true protection potential through directly collected data signals. The threshold wavelet denoising method based on the Birge-Massart strategy can effectively suppress the noise signal caused by poor contact between the probe and the soil, while making it easier to identify the affected area of stray currents.

Key words: close interval potential survey, cathodic protection, Birge-Massart threshold, signal processing