Table 4 Summary of other physics-based detection and location technologies
From: Current Trends and Perspectives of Detection and Location for Buried Non-Metallic Pipelines
Methods | Detection and Location conditions | Accuracy | Interference | Strengths | Weaknesses |
|---|---|---|---|---|---|
Infrared thermography [18] | Pipeline with high temperature | Low | Large | Easy to be operated | Easily influenced by nearby thermal sources |
HDRM [111] | Big resistivity difference | Low | Large | The electrode arrangement can be completed at one time with high efficiency | It is easy to be interfered with by the outside; the data processing and interpretation are complex |
Inertial gyroscope [121] | Open-ended non-metallic pipeline | High | Small | Plot and display the pipeline depth and path real-timely | The equipment is complex and expensive, and the diameter is limited by the size of the gyroscope. |
ECT [135] | Any ground surface | Low | Large | Low equipment cost, simple structure | Vulnerable to stray current |