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Fiber Bragg Grating (FBG) thermometers are commonly used for temperature compensation of FBG strain sensors. It is shown theoretically and experimentally that the thermal coupling between the underlying substrate and the respective sensors causes a delayed response to temperature changes. This can be explained by the heat capacity of the underlying substrate causing a temperature gradient between the surrounding and the substrate. In this contribution, we apply our theoretical result to achieve an improved accuracy in the strain measurement by an approximate factor of up to 3.5. In addition, experiments are carried out in which the thermal coupling in the system is adjusted by using thermal conduction paste. The results also show significantly improved temperature compensation.

Influence of thermal coupling on the temperature compensation of fiber optic strain sensors