The sensor measures relative displacement between the superior free end part of the extension rod reference tip, which is integral to the anchor, and the reference plate or the extensometer head. Two categories of displacement sensor are available. The fi rst one allows manual readings using a dial indicator or a depth gauge. A single sensor can be used to read several measurement points. The second category allows remote electrical readings and includes vibrating wire and potentiometer sensors. In this case, a single sensor is required for each measurement point.
The displacement sensor used with a borehole extensometer makes it possible to control, with precision, the stability of:
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