Potentiometers for Measuring Micro-inch Crack Displacements with Wireless Systems

Hasan Ozer; Charles H. Dowding; Dan Marron

doi:https://doi.org/10.21985/N2RX8P

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Potentiometers for Measuring Micro-inch Crack Displacements with Wireless Systems

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This paper describes qualification of devices to measure sub micro-meter changes in crack width, which is the basis of autonomous crack monitoring for control of blasting vibrations. Performance of LVDT, eddy current and potentiometer sensors to monitor long-term and transient displacements will be described. Potentiometers are attractive for wireless measurement, which is important as future autonomous crack displacement measurement almost certainly will be wireless. Long-term performance in the laboratory and the field is described in terms of drift, hysteresis, and noise upon exposure to cyclic changes in displacement and temperature. Transient performance is described in terms of relative response of the three systems to impact induced displacements with eddy current and LVDT serving as the benchmark.

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