Force sensitivity of regenerated fiber Bragg gratings in the temperature range from room temperature to 400°C

The temperature dependence of the force sensitivity of a regenerated fiber Bragg grating (RFBG) in a smf28 fiber was experimentally determined up to temperatures of 400°C for the first time. The force sensitivity was found to decline linearly with increasing temperature. The RFBG showed a pure elastic response to the applied forces and no wavelength drift occurred during the measurement. This demonstrates that RFBG based sensors are suited for force monitoring at temperatures up to 400°C.