Optical Sensing Fibre Optimised for use in Composites and Textiles

27 November 2012

The ability to embed sensors within a material gives engineers scope to measure intrinsic strain of components during their production, or use under varying load conditions, makes certain demands on the sensing fibre, not least of which is small size; in responding to this demand, FBGS has launched a smaller diameter DTG fibre at only 80µm.

According to FBGS, because the fibre is thinner: 

it is less invasive when embedded within laminate composite structures or textiles; 

it requires less force to strain it which makes it more suited for acoustic sensors and hydrophones and 

it is more ”elastic” in respect to its bending properties, it can be used in applications where small bend radii are required. 

The fibre has been released as a Beta-product for the 1550nm window and is drawn with an Ormocer coating that brings the outer fibre diameter to about 114µm.

FBGS says the new 80µm diameter fibre retains all the attributes of the larger 125 µm DTG product, including:

  • Extremely high mechanical strength
  • Spliceless FBG chains
  • Low bending loss (high NA fiber)
  • Wide temperature range (cryogenic to +200degC)
  • Ormocer coating
  • Uniform coating even at FBG position

CEO Hugo Mertens says “this development has come mainly as a result of market forces. The composite and textile industry is very exciting and manufacturers in this sector are starting to incorporate DTG’s for sensing applications. We are simply responding to requests for a fibre that is less invasive to the host material and at 80µm it is all but invisible.”

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