Smart Fibres FBG Temperature Sensors operates by one of two methods:
(i) Loose tube, whereby the FBG is isolated from external strain by a tubular housing, and wavelength variations due to the thermo-optic coefficient of the FBG are measured
(ii) Isolated coupon, whereby the FBG measures the expansion of a coupon of material, isolated from external strain, and wavelength variations due to the coupon thermal expansion plus the thermo-optic coefficient of the FBG are measured

The loose tube construction benefits from smaller sensor packaging and greater installation flexibility. The isolated coupon construction benefits from greated measurement sensitivity. For a truly, miniature temperature sensor, for example to embed within a composite, a terminal FBG can be housed within a polyimide capilliary of typ 400 μm diameter.

  • FBG temperature sensors
  • Zero power, EMI immune, intrinsically safe
  • Broad operating temperature range
  • Highly stable
  • Multi-km signal intergity
  • Numerous package options to suit application
  • Available as multiple sensor arrays

Related FAQs

FAQ. What is the warranty period for Smart Fibres equipment?

All of our fibre optic sensors come with a standard one year warranty. This warranty can be increased on a year by year basis. Extended warranty is available at the time of initial purchase on request.

FAQ. How do I calculate which wavelength to use for my FBGs to maximise the number of sensors on a particular channel?

Smart Fibres has created a wavelength budget calculation tool for FBG wavelength selection.

Please Email Us or call +44 1344 484111 with details of your application and we can help you create a wavelength budget.

FAQ. How do I compensate for the thermal effect on the strain measuring FBG?

We recommend that a second FBG, which is completely isolated from strain, is fitted close to the strain measuring FBG. Temperature compensation can be achieved in 2 methods, loose FBG or a strain isolated coupon with a known CTE. Our SmartSoft software includes a utility to automate this temperature compensation process.

FAQ. What fibre type is used in your systems?

Single mode fibre with a 9 µm core, 125 µm cladding, and a 155 µm Polyimide or 245 µm Acrylate coating. Optical Fibers with pure silica core, bend tolerant and small core e.g. 6/125 or 4/125, can also be used but with some optical power losses. Multi mode fibre cannot be used.

FAQ. Can we put different sensor types on the same fibre?

Yes, Smart Fibres’ WDM products allow the user to combine different sensors types, e.g. temperature, strain and vibration all on a single fibre.