Calculations and measurements for the design of a laser system for instantaneous location of a longwall shearer were made. The designs determine shearer location to approximately one foot. The roll, pitch, and yaw angles of the shearer track are determined to approximately two degrees. The first technique uses the water target system. A single silicon sensor system and three gallium arsenide laser beams are used in this technique. The second technique is based on an arrangement similar to that employed in aircraft omnidirectional position finding. The angle between two points is determined by combining information in an onmidirectional flash with a scanned, narrow beam beacon. It is concluded that this approach maximizes the signal levels.
Gallium arsenide lasers; Position indicators; Shearing; Tracked vehicles; Electro-optics; Laser outputs; Light scattering; Line of sight
NTIS Accession No.
Design of a laser system for instantaneous location of a longwall shearer
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