Development of a Deep-penetrating Borehole Geophysical Technique for Predicting Hazards Ahead of Coal Mining. Phase II.
Suhler-SA; Tranbarger-O; Converse-ME
NTIS: PB/84-239599 :87 pages
The objective of this work was to develop a deep-penetrating borehole geophysical technique for predicting hazards ahead of coal mining. Various methods were evaluated to determine their potential for detecting geological and work-related hazardous conditions and their practicability of implementation. The study indicated that a borehole pulse electromagnetic reflectometer (radar) had the most promise as a viable field technique. Based on the results, a borehole monostatic baseband pulse radar was designed, developed, and tested in prototype form. Field tests of the prototype model showed that underground features were detectable by the technique. Follow-on developments included the design and construction of an engineering model radar that would overcome the problems associated with the prototype model and also provide enhanced detection capabilities. These developments lead to an advanced design borehole radar system providing a directional antenna in a 3-in-diam probe.
CP; Final Contract Report;
NTIS Accession No.
Southwest Research Inst.