Embankment Extensometers

Reference products codes: D232

Embankment extensometers are used to measure soil strains in large earth structures.

Embankment extensometers are usually incorporated in filling materials, chained together by means of extension rods.

The measuring unit is a telescopic section equipped with displacement transducer.

The system consists of several measuring units connected by extension rods to the anchor plates.

Vibrating wire transducer is essentially composed by a taut wire clamped at its ends and tensioned so that it is free to vibrate at its natural frequency. The frequency of vibration varies with the wire tension and thus small relative movements between the two end clamps.
With VW transducers frequencies rather than voltage levels are measured, so a dedicated readout/datalogger must be used to measure the resonant frequency. These ones excites the VW transducer, measures the response, performs some calculations on the response, and returns the result.
SISGEO VW transducer uses ‘pluck and read’ method and not ‘auto resonant’ method; when the readout/datalogger plucks the wire a magnetic attraction is created to the coil and the wire start to vibrate and it causes an alternating voltage of the same frequency of the natural frequency of the wire; the voltage signal is transmitted on the cable and read from the readout/datalogger.
VW transducers have a reputation for long expected life and long-term stability.

Readable by

Datasheet

Manual

Data processing

Datasheet

Manual

Data processing

Related
Products

Related
projects