Exploration of the boundaries of an underground coal seam

Details Exploration of the boundaries of an underground coal seam Exploration of the boundaries of an underground coal seam

1974-09-10

1976-06-01

Wilbur, Maynard R.

Communications: electrical

Selective

Having electron beam device

73 678S, 181104, 340 155MC, 299 1, G01V 100, G01V 122

Patent

active

039613070

ABSTRACT:
Pulses of monochromatic coherent sound waves are emitted at an underground test station into a coal seam from several closely juxtaposed sources to form a beam whose reflection at a discontinuity in the seam is detected by a group of receivers. The time lapse between the outgoing and incoming sound pulses is a measure of the distance of the seam boundary from the test station and, upon a controlled shifting of the phases of the outgoing and/or incoming beam components, can be displayed on an oscilloscope screen as a function of sweep angle in an azimuthal and/or an elevational plane.

REFERENCES:
patent: 3346068 (1967-10-01), Woods et al.
patent: 3371964 (1968-03-01), Weber
patent: 3766519 (1973-10-01), Stephenson
patent: 3858167 (1974-12-01), Stas et al.

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