Table 1.

Properties of the FBG sensors.

FBG Length	10 mm
Strain limit	5000 $\mathsf{\mu }\mathsf{\epsilon }$
Strain sensitivity	~1.2 $\mathrm{pm}/\mathsf{\mu }\mathsf{\epsilon }$
Operating temperature range	−40 to 120 $℃$
Thermal sensitivity	~9.9 pm/°C
Fiber coating	Polyimide
Fiber re-coating diameter	145–165 $\mathsf{\mu }\mathrm{m}$