Tunnel detection using a pipeline pig
US10444395B1 · kind B1 · utility
2Cited by
5References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 30, 2018 |
| Grant date | Oct 15, 2019 |
| Priority date | — |
| Expiry date | Aug 30, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and system for detecting a subsurface tunnel includes propelling an instrumented pipeline pig through a horizontal detection conduit, acquiring and analyzing magnetometer measurements and VLF EM resistivity measurements to detect distortions and/or anomalies in the Earth's magnetic field and/or VLF electromagnetic field, respectively, and correlating the data with position data of the pipeline pig to compute a parameter of a tunnel such as, for example, location, size and depth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.