Continuous wave medium frequency signal transmission survey procedure for imaging structure in coal seams
US4577153A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1985 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | May 6, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Instrumentation and procedures for detecting geological anomalies occurring in layered coal formations. The instrumentation comprises a medium frequency continuous wave narrowband FM transmitter and receiver pair. Two instrument configurations are disclosed with one being a portable instrument for use within an existing mined area and another being a downhole instrument for insertion into boreholes in unmined areas. Survey procedures are provided to detect anomolies through signal attenuation, path attenuation and signal phase shift. Continuity measurements provide data to determine the existance of anomalies. Tomographic techniques are employed to provide a visual image of the anomaly. Computer aided reconstruction techniques provide such visual images from the generated data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.