Optical Fibre Extensometer

Deformation measurement in the field of civil engineering

- Embeddable or surface sensors
- High accuracy
- Temperature compensated
- Low invasive technique
- Uniform sensitivity
- No pre-tension nor calibration required
- Intrinsic immunity to electromagnetic fields
- Long-term reliability
- Possibility of curved measurements

The Nixus extensometer measures deformations.
It is designed to be embedded into concrete or mounted on surface.
The sensor translates strain into a length variation of the sensing zone of the optical fibre also called the measurement basis.
The length of this basis can be chosen from a few tenth of centimetres up to several metres, in order to observe phenomena at the structure size.
Several sensing zones can be put in sequence along a single fibre, enabling simultaneous strain measurements in several areas.
The sensor can appear as a sheath fibre, for embedding into the material during the fabrication (Nixus Sheath), or as a tape for surface mounting (Nixus Tape).
The sensors are linked to the Nixus reading unit by a fibre with a reinforced sheath, whose length can be whatever which is needed.
Robust and accurate thanks to its fibre optic technology, the Nixus extensometer is easy to install as no pre-tension nor calibration are needed.
The flexibility enables curved shapes measurements.