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Structural Health Monitoring

Predict, detect and prevent overload and defects in
• Bridges
• Tunnels
• Buildings
• Railroads

Condition Monitoring of wind farms

• Blade load monitoring
• Blade damage detection
• Ice detection
• Gearbox monitoring
• Foundations monitoring
• Lifetime prediction

Condition monitoring of industrial assets

• Transformer hotspots
• Circuit breakers
• Steel & glass furnace
• Overhead cranes
• Cryogenic installations
• Condition rotating equipment

Continuous monitoring to detect any change

Fiber optic FBG sensors are capable of capturing data at multiple point along a large structure, measuring strain as small as 1µƐ up to more than 5000µƐ, temperatures up to 1000°C, near DC and high frequency vibrations as well as current, tilt, displacement and more…

A fiber can contain multiple sensing points called Fiber Bragg Gratings (FBG). Packaged FBG sensors can be daisy chained to simplify cabling.
An FBG fiber can directly measure temperature. 1°C will change the light reflected by the FBG by 10pm.
A packaged FBG fiber can translate strain into vibration and acceleration.
A packaged FBG fiber can very accurately measure tilt and displacement.
A packaged FBG fiber can measure current.
An FBG fiber can directly measure strain. 1 microstrain will change the light reflected by the FBG with 1pm.
Applying a special coating on the FBG fiber, it can measure H2 and humidity.
An FBG fiber attached to the circumference of a bearing or gearbox can measure load and torque.
A packaged FBG fiber can measure pressure.
An interrogator sends light into the FBG fiber and correlates the light reflected by each of the FBG’s with temperature, strain or other properties at the respective locations.

FBG sensors outperform electrical sensors in harsh environments

Fiber optic FBG sensors are ideally suited for demanding industries. They outperform electric sensors in environments with extreme temperatures, corrosion, electromagnetic interference and are safe to use in explosive applications.

The unique advantages of our FBG interrogators

While fiber sensors are versatile, accurate and affordable, interrogators can be expensive. Thanks to its silicon photonics chip Sentea offers widely interoperable, reliable and cost-effective interrogators, enabling FBG fiber sensing for large scale deployment.

Product Specifications

Sentea interrogator
Number of fibers
1 fiber
4 fibers
8 fibers
Max. number of sensors per fiber (1)
10 (default) – 16 (optional)
Max. sampling frequency (2)
24 kHz
Wavelength range
1530 - 1570 nm
1525 - 1575 nm
Wavelength sensitivity (3) / Wavelength accuracy (4)
< 0.5 pm / < 10 pm
Data interface
Ethernet (TCP/UDP/MQTT) – Modbus TCP
Software interface
PeakViewer™ visualization app – API for Python
Dimensions / Weight
165 x 135 x 65 mm / 1.2 kg
Operating conditions (non-condensing)
0 to +40 °C
-20 to +60 °C
List price (5) / lead times (6)

Starting at 2,750 EUR / 4 weeks

(1) Minimum peak spacing of 1.6nm up to 2kHz or 3nm above 2kHz required in operation | (2) Valid for 1 fiber connected. For n fibers connected, this value has to be divided by 2n | (3) Defined as standard deviation over 10 minutes | (4) Over full temperature range | (5) Sentea general sales conditions apply | (6) Applies for small quantities, for larger quantities please contact us.

Would you like to learn more?

Our application engineers will be happy to tell you more about FBG fiber sensors. They can help you to find the right sensors for your sensing or monitoring application, explain how to interface with your systems and software, or prepare a customized quotation. Complete the contact page below and an application engineer will contact your shortly.

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