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Introduction

The most complete and accurate knowledge of structures and environments will push engineering to a new level of optimization.

In this perspective, optical fibre sensing represents the best performing solution to acquire precise data in challenging environments. How?
 
  1. Light propagating through an optical fibre is affected by the surrounding environment
  2. By measuring specific light parameters, one can reconstruct what happened to the fibre
  3. One can infer with extremely high accuracy the conditions of the structure under monitoring and its environment, if the fibre is integral with it (i.e., deformation, temperature, strain, displacement, pressure, etc.)
NOVA technology is based on Fibre Segment Interferometry (FSI)

Partially reflecting elements are integrated into the sensing fibres. The distance between two consecutive reflective elements is a segment. The segment length L (from 10 mm to tens of meters) defines the spatial resolution. 

Strain (∆L) or a temperature difference (ΔT) applied to a segment induces a phase change to the light carrier signal for each reflector. From the measurable phase change, it is possible to quantify the deformation.
Introduction
NOVA technology measures the integral of the quantity of interest over a segment

NOVA sensors: more advantages

NOVA fibre sensors will trigger a new era of structural and environmental monitoring also thanks to the several advantages over electrical sensors:
Intrinsically passiveNo power needed at the sensing points
EMI immuneIntrinsically insensitive to electro-magnetic interferences
DurableThe glass fibre is resistant to corrosion, high temperatures, harsh environments
Accessible remotelyLight propagates unperturbed before reaching the sensing area
CompactOptical fibres are as thin as a human hair and can be embedded into composites
MultiplexableSeveral sensors can be arranged along the same fibre
And many more...