FIBER OPTIC SENSING
Sensing Technology
- Point and Distributed Sensing
- Full-Service Solution Provider
- Independent Fiber Optic Experts
- Own Production Facilites
- In-House R&D and Testing Center
Technologies Overview
Fiber bragg grating
Fiber Bragg Grating (FBG) is a sensitive optical microstructure just a few millimeters long, integrated into a standard single-mode fiber.
- It monitors well-defined points.
- An FBG has sensors for strain, temperature, tilt, acceleration, displacement, and more.
- Fiber Bragg Grating Technology.
- Up to 40 multiplexed sensors per channel.
- Up to 16 channels on one interrogation unit.
Distributed Sensing
- Monitor parameters over the complete length of the fiber.
- Measure strain and temperature.
- Up to 50km with one device.
- Raman and Brillouin sensing technology.
Acoustic Sensing
Distributed Acoustic Sensing (DAS) relies on Rayleigh backscatter, which interacts with the optical fiber exposed by acoustic waves.
- Monitor acoustic events.
- Detect location with an accuracy of 1-10m.
- Up to 50 km with one device.
- Rayleigh sensing technology.
Why Fiber Optics
Lifetime
Almost no maintenance. Cable lifetime >20 years
Passive Sensor
No electrical power at the measurement point
Long distance
Remote monitoring (50 km and more)
High sensitivity and accuracy
At sensing point Insensitive lead in to reduce disturbances
Harsh and explosive environments
Resistant to corrosion, lightning, etc.
Immune to EMI
Electromagnetic interference
FBG Sensing
Fiber Bragg Grating (FBG) is a sensitive optical microstructure just a few millimeters long, integrated into a standard single-mode fiber.
Fiber Bragg Gratings
- It acts as a wavelength selective mirror.
- Each sensor has a unique wavelength.
- Sensitivity to strain and temperature is intrinsic to FBGs.
- Individual packaging and mechanics to measure different parameters.
- Sensors can be close as a few mm or separated by a few km.
System
- It monitors well-defined points.
- An FBG has sensors for strain, temperature, tilt, acceleration, displacement, and more.
- Individual sensor housing or direct integration into cables/FIMTs.
- Up to 40 multiplexed sensors per channel.
- Up to 16 channels on one interrogation unit.
Case Studies
Canara bridge
- NBG provided system design/installation support and commissioning of our FiberGuard system.
- Integration with 72 video cameras (37 robotic ones) and automatic perimeter lighting.
- Security alerts within 5 seconds of attempt and an accuracy of 8 meters.
- Keyprocessor access control system. Satel security alarm system. Commend intercom system.
GMÜND
- 500m PeriGuard fence-based installation.
- 200m FBGuard fence-based installation.
- Road and structural health monitoring, cabinet/utility hole monitoring, and temperature sensing.
DAS Sensing
A Distributed Acoustic Sensing (DAS) is a microstructure with a few millimeters in length.
Comparison
David Laister
Fiber Optic Sensing Specialist.
“Challenge me with your project”
