EpsilonPeak
The first Fibre Bragg Grating (FBG) – EpsilonPeak averaging the structural strains along its base (10 mm as standard) for accurate and repeatable measurements with high sensitivity and range.
The unique FBG sensor without spectrum splitting that allows the measurements and control of non-homogenous materials such as Fibre Reinforced Polymers (FRP) or concrete.
The unique FBG sensor without spectrum splitting that allows the measurements and control of non-homogenous materials such as Fibre Reinforced Polymers (FRP) or concrete.
EpsilonPeak Advantages
Physical Quantities Measured
Strain Sensing
Temperature Sensing
Typical Materials
Concrete
Steel
Composite
EpsilonPeak Application Areas
Structures | Bridges | Piles | Dams | Pipelines | Tunnels | Railways | Earthworks | Laboratories… and more
How our FBG sensor works vs. competition
Homogeneous strains along the FBG sensor cause proportional changes in its period (Λ), shifting the spectral peak to shorter or longer wavelengths.
Homogeneous strains along the FBG sensor cause proportional changes in its period (Λ), shifting the spectral peak to shorter or longer wavelengths. However, homogeneous strain are rare in practice. Materials like FRP, concrete, or steel under plastic deformation create non-uniform strain fields, leading to broadened, split, or deformed spectral peaks, making accurate and trusted strain measurements impossible. Our sensor averages these non-uniform strains over the grating length, enhancing measurement range and reliability, similar to electrical foil strain gauges.
Our sensor – EpsilonPeak
Competition
Period in non uniform strain
EpsilonPeak Technical Specifications
Optical properties
Range of available central Bragg wavelengths1
1407-1607 nm
Accuracy of central Bragg wavelength
±50 pm
Full Width at Half Maximum
< 150 pm
Side Lobe Suppression Ratio
15 dB
Type of FBG
uniform/apodised
Fibre outer diameter (excl. coating)
125 μm
Fibre type2
bend-insensitive photosensitive
Sensing properties
Physical length of FBG
1-10 mm
Number of FBGs on one fibre
customised
Strain range3
from ± 4000 to ± 50 000 με
Strain accuracy
not worse than 0.5% of the measurement range
Thermal compensation
external/second FBG
Working temperature
from -30 to +70°C
Fibre termination4
none, bare fibre
Calibration card5
is added to each sensor
1 Exact wavelengths available upon request
² As standard, different types of optical fibres available upon request
3 As standard for bend-insensitive photosensitive fibre. Strain range may differ
for different types of optical fibres
4 As standard, different fibre terminations available upon request
5 Each FBG is carefully checked. Each sensor is supplied with a calibration card
containing an equation that allows the conversion of the central wavelength
into strains
² As standard, different types of optical fibres available upon request
3 As standard for bend-insensitive photosensitive fibre. Strain range may differ
for different types of optical fibres
4 As standard, different fibre terminations available upon request
5 Each FBG is carefully checked. Each sensor is supplied with a calibration card
containing an equation that allows the conversion of the central wavelength
into strains
Yielding steel and composite (FBG application examples) and strain map
EpsilonPeak Installation
Each installation should be designed individually, taking into account specific requirements and local conditions. However, there are three typical methods:
Gluing directly onto the surface
Bonding directly to sanded, cleaned and degreased structural surface
Installation during composite production in the infusion and pultrusion proces
EpsilonPeak FAQ
How is the fibre with FBG terminated? Is it possible to modify the connectors?
What is the minimum physical distance between consecutive FBGs?
From what wavelength range can the centre wavelength be selected? Is it only the III telecom window, or ~850 nm also?
What interrogators does the FBG sensor work with?
What type of FBGs do you produce?
Is it possible to modify the length of the FBG?
How long can the entire sensor system be?
What is the possible operating temperature range of the sensor?
What is the maximum length of the inlet patchcord between the interrogator and the sensor?
How to install FBG on structural elements?
What are the lengths of standard FBG?
How many FBGs can be made on one optical fibre?
How to ensure repeatable installation of successive FBGs?
Can your FBG be used to measure strain in a static tensile test of steel?
Can I use your FBG to monitor composite materials?
Can I use your FBG in tests that take into account cracking of the material under test?
How to convert the wavelength of the FBG into strains?
Can FBGs be used for dynamic measurements?