Design on New Fiber Sensing Scanner System Based on A-thermal Fiber Bragg Grating

Abstract

This study is based on multi-beam interference and transmission high-finesse Fabry-Perot interferometer In order to improve the reflection on fiber we use the coating technology This type of interferometer is very suitable for scanning the fiber Bragg grating signals In the foreign country this technology has been used to scan the fiber Bragg grating signals with the wavelength range of 1510nm to 1590nm and the operating temperature of 0°C to 50°C In this study the attempt is to achieve a cost-down interrogation system The core of interrogation system is the high finesse transmitted Fabry-Perot interferometer and the system is designed for improvement After simulation the wavelength range of the system can be confirmed in 1516nm to 1620nm For the effects of temperature the A-thermal fiber grating to extract the correction positions of FBGs is introduced Furthermore we analyzed the temperature and extracted the positions of FBGs and defined the operating temperature from -40°C to 50°C For the PZT calibration the three-order polynomial curve fitting to model the relation between driving voltage and transmission wavelength of a Fabry-Perot scanner is applied In the software application we use LabVIEW program for signal processing and PZT calibration for our own design Finally a new interrogator with an A-thermal FBG as a reference in sensing FBG sensors is demonstrated successfully

Date of Award	2014 Jan 24
Original language	English
Supervisor	Yu-Lung Lo (Supervisor)