Method of and apparatus for locating disturbances in a mineral seam
AssigneeCoal Industry (Patents) Limited
InventorsDavid J. Buchanan, Iain M. Mason
Life of this patent
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Abstract
Faults in an underground coal seam are located by firing a shot at one point in the seam and detecting the seismic reflections in an array of geophones. Signals from the geophones are recompressed and analyzed according to an exponential formula to give a holograph of the seam and to predict the fault pattern.
Claims20
A method of locating disturbances in a mineral seam characterized by locating in the seam underground at a first area an array of detector means and at a second area wave energy source means, operating the source means to generate seismic waves and detecting the waves in the detector means and converting said detections into electrical signals, processing said signals to produce recompressed signals and producing a holograph from said recompressed signals, said holograph indicating any disturbances in the form of an exponential characteristic related to wave phase and group velocities.
A method of locating disturbances in a mineral seam comprising the steps of locating in the seam underground at a first area an array of detectors and at a second area a point source of sound, operating the point source to generate seismic waves and detecting reflections of the waves in the array of detectors and converting said reflections into electrical signals, processing said signals to produce a recompressed signal and producing a holograph indicating any disturbances in the form of an exponential characteristic related to the phase and group velocities of the centre frequency of the frequency band.
A method of locating disturbances in a mineral seam comprises locating disturbances in a mineral seam and including the steps of locating in the same seam underground at a first area, an array of detectors and at a second area a point source of sound, operating the point source to generate siesmic waves and detecting reflections of the waves in the array of detectors and converting said reflections into electrical signals, processing said signals to remove noise and to produce a recompressed signal, producing a holograph indicating any disturbances in the form of an exponential characteristic identified by the formula:
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Apparatus for locating disturbances in a mineral seam comprising a source of seismic waves, an array of detectors for detecting the waves and processing electrical signals generated by the detectors when waves are detected, the processing means including means for recompressing the signals and further means arranged to produce a holograph of the seam from the recompressed signals.
Dependencies are inferred from the claim text.