FIBER OPTIC SENSING

Sensing Technology

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

Distributed Temperature and Strain Sensing (DTS and DTSS) rely on Raman or Brillouin backscatter technology to detect mechanical forces or temperature changes along the complete length of the fiber.
  • 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

System

Applications

Case Studies

Canara bridge

GMÜND

DAS Sensing

A Distributed Acoustic Sensing (DAS) is a microstructure with a few millimeters in length.

Comparison

David Laister

Fiber Optic Sensing Specialist.
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