From: Current Trends and Perspectives of Detection and Location for Buried Non-Metallic Pipelines
Methods | Detection and location conditions | Accuracy | Interference | Strengths | Weaknesses | |
---|---|---|---|---|---|---|
Direct connection [23] | Complete tracer line, dew point | High | Small | Strong signal, high SNR, high accuracy | Complete tracer line | |
Induction [26] | ||||||
 Electric dipole | Ground surface flat and broad | Low | Large | Strong reflected signal and easy to receive | Limited by site conditions and characteristics | |
 Magnetic dipole | Ground surface flat and broad | Low | Large | flexible convenient and efficient to operation | Easy to interference from land stray current | |
Tracer probe method [33] | Open non-metal pipeline | High | Small | Accurate location and easy to operation | Pipeline diameter limited by the size of the probe |