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Innovation and comparison

Innovation and comparison
NOVA technology is sensitive to any external physical change introducing disturbance in the fibre, such as temperature, strain, pressure, vibration, humidity, inclination etc.

Fibre Bragg Grating technology (FBG) represents the most common technology for discrete optical fibre sensing.

Compared to FBG standards, NOVA moves the bar ≈ two order of magnitude higher in respect to the most critical sensing parameters.

NOVA concept merges the features of discrete and distributed fibre sensing techniques, covering a wider range of applications with the same technology.

Comparison FBG-FSI: Strain

Comparison FBG-FSI: Strain
Tensile test comparison between FBG and NOVA FSI sensors.
Load held at 0 N before linear increase.

FBG
  • standard deviation of 0.75 με @ 250 Hz

FSI Nova
  • standard deviation of 0.04 με @ 1 kHz
  • FSI captures the strain oscillation directly caused by our INSTRON calibration machine

Comparison FBG-FSI: Temperature

Comparison FBG-FSI: Temperature
FBG
  • standard deviation of 0.02 °C @ 50 Hz

FSI
  • standard deviation of 0.003 °C @ 1 kHz

FSI vs current fibre sensors: overview

Comparison of the most relevant sensing parameters for NOVA technology1 and the most spread fibre sensing techniques:
Technology
Distributed/ Discrete
Detectable deformation
Data rate
Spatial resolution
Sensors per interrogator - sensing range
FBG2
Discrete
1 µstrain
< 10 kHz
2 - 10 mm
≈40
Rayleigh OFDR3
Distributed
1 µstrain
< 100 Hz
1 - 10 mm
20 - 1000 m
Rayleigh DAS3
Distributed
< 0.1 µstrain
< 5 kHz
> 5 m
10 - 70 km
Brillouin OTDR/OTDA3
Distributed
2 - 10 µstrain
< 1 Hz
0.1 - 5 m
5 - 150 km
NOVA FSI
Discrete/Distributed
< 0.01 µstrain
1 Hz - >200 kHz
0.01 - 100 m
>100
INTELLECTUAL PROPERTY PUBLICATION NUMBER: W0 2019/166765/A1
Based on typical values for commercial FBG interrogators 
Distributed optical fiber sensing: Review and perspective, Ping Lu et al., Appl. Phys. Rev. 6, 041302 (2019)
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