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Microseismic Instrumentation Developments. A Tape-triggering System and Energy Analyzer.
MISSING :12 pages
Two instruments have been constructed that extend microseismic data collection and processing capability for Bureau of Mines research in rock burst, coal bounce and outburst, and roof fall monitoring. The first instrument is a 13-channel tape-triggering system. This system allows better utilization of instrumentation tape recorders by collecting data digitally, turning the tape on only when valid data are present, and increasing the dynamic range of the recorder by using digital data. A digital-to-analog converter is used to provide analog output of the recorded digital data. The instrument records a much larger time slice of transient events than do current commerical devices. The second instrument is a microseismic energy measurement device. This device uses recent developments in integrated circuits to overcome the dynamic range and accuracy limitations of previous instruments. The analog signal is converted to a digital one, and then high-speed multiplication techniques are used to square the amplitude value in real time and integrate it.
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Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division