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Evaluation of Ultrasonic Measurement Systems for Bolt Load Determinations
  • Published Date:
    1/1/1990
Filetype[PDF - 5.38 MB]


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Evaluation of Ultrasonic Measurement Systems for Bolt Load Determinations
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  • Description:
    The U.S. Bureau of Mines has developed ultrasonic measurement instrumentation capable of measuring strains and elongations on tensioned and untensioned mine roof bolting systems. This report evaluates the pulsed-phase-lock-loop and pulse-echo systems. The pulse-echo systems measure time of flight of a signal through the bolt. The ultrasonic instrument converts the measurement into elongations or stress. The most recent Bureau instrument development converts travel-time measurements directly into elongation, load, stress, and torque by simple data manipulation from the keyboard. Bolt preparation and instrument calibration are described in detail.

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