A wavelength demodulation system of fiber grating sensor based on the combination of piezoelectric ceramic stack scanning and fiber Bragg grating scan filtering is presented.Two U-shaped metal brackets are designed and two fiber Bragg gratings are stuck on the two sides of the U-shaped metal brackets respectively

and equal prestressing force is imposed on them.This structure expands the scanning scope of demodulating grating

balances the tension of the PZT stack

strengthens the operation reliability

and improves the scan linearity.The experimental results show a good linear relationship between voltage and wavelength shift in the voltage range of 0

2

00V

and the wavelength range of linear tuning is about 3.8 nm with the sensitivity of 0.009 7 nm/V.Demodulating te

st on the temperature sensor and pressure fiber grating sensor respectively with the system

the testing results fit the sensor’s characteristics.