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Temperature and strain measurement with the FBG-Technology is intrinsic. One single mode fiber with a diameter of 150µm has multiple sensors applied that allows performing the measurement. The fiber from there to the next sensor or the interrogation unit is without any more influence and works only as a data transfer fiber like in the telecommunication.

Most applications require additionally an extra sensor element to protect the fiber or to allow the strain sensor to be pre tensioned before being applied in order to measure also negative strain.

Applying this sensor inside composite material, it is mostly the bare fiber that goes in there. Sensor elements would be too big. The challenge is to design the output on the fiber in order to protect it.