CINDTECHS provide Fibre Bragg Grating (FBG) stain and temperature sensors , which are recorded within the core of a single mode optical fibre, just 9 microns in diameter. Together with the outer cladding and a protective polymer coating, these fiber sensors are truly miniature, generally just 0.15 or 0.25 mm in diameter. For many strain-sensing applications it is practical and appropriate to simply embed or attach these unpackaged SmartFBG sensors within or to the structure under test. For many other applications alternative sensor constructions are required, for instance to deploy more robust sensor, to provide a sensor with a more distributed strain response, or to offer measurement of other parameters such as temperature, pressure etc. Smart Fibres have developed a range of "Smart" FBG sensors to suit a multitude of applications.

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 FBG TEMPRATURE SENSORS 

The reflection wavelength of the FBG depends on period, modulation characteristics of the grating, and is influenced by the ambient conditions. This allows the utilisations of FBGs as sensor for temperature, on which the Bragg wavelength is a function of the temperature. 

The use of FBG for temperature sensing enables several advantages compared to electrical sensor.
  • Absolute temperature measurement, where always is a unique relationship between wavelength and temperature.
  • A fast temperature response time this is needed for the measurement of fast temperature changes.
  • No need of amplification means under way (>20km) for the large distances.
  • A good corrosion resistance.
  • Immune to electromagnetic interference
  • It is intrinsically passive
 
 

FBG STRAIN SENSORS

FBGs are known to have a stable wavelength response as function of the applied strain. Comparing with metal strain gauge, they provide some superior qualities making them very suited to special applications:

  • It can be fixed directly or integrated in a patch on the surface of the structure without any coating removal.
  • It can directly integrated into composite materials like glass or carbon fiber reinforced composites which are widely used in modern constructions.
  • It can be fixed directly or integrated in a patch on the surface of the structure without any coating removal.
  • A Long term stability under mechanical fatigue conditions.
  • It can be fixed directly or integrated in a patch on the surface of the structure without any coating removal.
  • Absolute measurement.
  • Immune to electromagnetic interference.
  • It is intrinsically passive.
  • No drifting and it can become read out over large distances.
  • Multiple FBGs sensor can be monitored in series on one single optical fiber.
  • A good corrosion resistance.