Temperature Measuring Research Based On FBG Matching Demodulation Technology

As a new type of sensor, fiber Bragg grating sensor have the advantages of anti-electromagnetic interference, good insulation properties, corrosion resistance, Wide measurement range and become one of the most promising and potential sensors; At present, several organizations have made a research in fiber grating sensor demodulation technology Developing high-precision, low-cost fiber bragg grating demodulation system is a key technology of fiber bragg grating research.This paper proposed a fiber grating sensor demodulation system which takes MSP430 as core, and improves conventional demodulation method. The system takes semiconductor laser as light source. The semiconductor laser is a device with high power density and particularly high quantum efficiency which has broadly applied in the field of scientific research, industry, military affairs and medical treatment because of the advantages of high conversion efficiency, small volume, light weight, high reliability and can be directly modulated.1. Introduced the characteristics of fiber Bragg grating sensor and researching progress home and abroad, illustrated several common fiber bragg grating demodulation method .proposed a new temperature sensing fiber Bragg grating demodulation system.2. Detailed analysis is carried out, improvements in view of the characteristics of the light source is made based on traditional fiber grating demodulation method. The improved demodulation method can effectively reduce the influence of unstable light source power.3.Demodulation system circuit is designed, including photoelectric signal converter and amplifier circuit, low-pass filter circuit, MSP430F167 MCU signal acquisition and operation circuits, liquid crystal display circuit. the program of demodulation system including AD conversion, data processing, liquid crystal display driver is written.4.Experiments and matlab simulation according to actual parameters is taken to the demodulation system to demonstrate the validity and the feasibility of the scheme.