Moving Mountains with the Help of Strain Gages
This video describes a unique strain gage-based sensor designed to measure the width of a crack in concrete or rock. With a resolution of 1/10000th of an inch, this sensor represents the capabilities of custom sensors from VPG Stress-Tek and Hybrid Sensors available from VPG Micro-Measurements.
http://www.vishaypg.com/docs/11574/hybrsens.pdf
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