원문정보
초록
영어
In this article we have discussed the relative humidity sensor based on fiber grating Fabry-Perot (FBG-FP) coated with polyimide (PI) as a moisture sensitive film in theory. The moisture expansion coefficient of PI film as moisture strain on the FBG-FP sensor, which will result the change of the fiber core effective refractive index, the length of the F-P cavity and the period and effective refractive index of FBG. For that reason, the interference fringes of the reflection spectrum will be changed also. The shift of peak wavelength of the spectrum is traced by the simulation of Matlab. We discuss three situations: the coating on the FBG, FP cavity and the both, and regardless of the temperature changes, the simulation results show that the RH sensitivity can reach to 3.77pm/%RH, 2.12 pm/%RH, 4.05 pm/%RH, respectively.
목차
1. Introduction
2. Principle of FBG-FP Sensor
3. Simulation of the coated FBG-FP humidity Sensor
3.1 Only the F-P Cavity Coated with PI
3.2 The F-P Cavity and FBG are Coated with same Thickness PI
3.3 The F-P Cavity and FBG are Coated with Different Thickness PI
4. Conclusion
Acknowledgements
References