Frequency Optimization of PZT-FBG Voltage Sensor Based on Temperature-Independent Demodulation Method

Temperature-Independent Sensor of the Magnetic Field Based on FBG and Terfenol-D

“…When the external temperature changes, the overlapping area of the spectra of the double FBGs in the final output will not change, and the magnetic field sensing is not affected by temperature changes. Compared with the previous double FBG sensor that eliminates temperature influence by measuring the area of the overlapping region of the output spectra [ 52 ], the response function of the measured peak width change has better linearity.…”

“…It can be seen that the sensor combined with single FBG and Terfenol-D is sensitive to temperature changes, with wavelength offset up to 260 pm, while the sensor combined with double FBG and Terfenol-D has a slightly fluctuating peak width with temperature changes, keeping within the range of 15 pm. The results show that the double FBG and Terfenol-D sensor can achieve temperature compensation and eliminate the thermal spectrum shift caused by the thermal expansion of the alloy material and the effective refractive index n eff change of the fiber core caused by temperature [ 52 , 57 ], resulting in a fully magnetically induced output spectrum change with good temperature stability.…”

“…To solve this problem, Yanxiao He proposed a PZT-FBG voltage sensor in 2021 that is not affected by temperature changes. This sensor combines piezoelectric ceramics (PZT) with FBG [ 52 ]. The PZT converts the applied voltage on the material into deformation, which is then monitored by FBG to detect the voltage.…”