FBG Fiber Optics Sensing

FBG fiber optics sensors. Measuring with light.

A fiber Bragg grating (FBG) is a microstructure within the core of an optical fiber comprising a periodic modulation of the refractive index of the underlying glass material. If broadband light guided within the core hits on this periodic microstucture one specific wavelength gets reflected and all other wavelengths of the guided broadband light can pass unhindered.

The periodicity of the FBG defines which specific wavelength gets reflected and is perpetually inscribed into the glass like a spectral finger print. Only if an external force or change in temperature is induced to the microstructure, the periodicity of the FBG will change slightly leading to a specific wavelength shift of the light reflected at the FBG.

Unique features. Uncomparable benefits.

  • Thermal range from -180°C to 800°C

  • Strain sensitivity: +/- 1 με

  • Thermal sensitvity: +/- 0,5 °C

  • FBG sensors with NO insertion error thanks to 125 mm external diameter of the fiber.

  • Total EMI immunity. FBG sensors are chemically inert, insensitive to oxidation and erosion.

  • No electric signal inside the fiber optic, so FBG sensors can be used totally submerged in a liquid , even gasoline, without risk of malfunction or explosion.

  • Stable embedded FBG sensors installation inside carbon fiber components, with special autoclave-proof APC/FC connectors.

  • Dedicated multichannel interrogator units

  • Up to 64 sensors

  • Up to 2.5 kHz sampling rate