Research On Fast Response Fiber Bragg Grating Temperature Sensor

Fiber Bragg gratings(FBGs)are optical fiber sensors that offer many advantages over traditional electrical signal sensors in terms of high insulation,high sensitivity,electromagnetic interference resistance,corrosion resistance,ease of reuse and networking,and suitability for use in complex and harsh environments.FBG sensors can be used to measure various physical parameters such as temperature,vibration,pressure,and strain,and are widely used in areas such as environmental exploration,water resources and hydropower,road construction,aerospace,and scientific research.However,fiber optic sensors are highly susceptible to damage due to their silica material,which is fragile and can easily break due to its small size.Thus,protective packaging is necessary before use,which can affect the temperature response time of the sensor.Therefore,the goal of this study is to design two types of fast-response temperature sensors suitable for different temperature measurement environments and to explore FBG sensor packaging methods and the development of real-time temperature detection systems.Specific research work in this study includes the following aspects:(1)Summarizing the current status of FBG temperature sensor packaging both domestically and abroad,and conducting research on the slow response speed of existing fiber-optic grating temperature sensors.Analyzing the factors that affect the response speed of FBG temperature sensors,including sensor size,material,and external flow rate,and improving the packaging method for two different external environments.(2)Developing FBG temperature sensors suitable for low-heat-capacity environments with a flow rate(such as air),analyzing the effect of external fluid flow rate on the temperature response time of the sensor,and designing and producing fast-responding FBG temperature sensors from an innovative packaging perspective,including simulation verification and experimental testing.The results indicate that the designed sensor structure has good temperature response characteristics,and the temperature response time can be as low as 100 ms.(3)Developing FBG temperature sensors suitable for high-heat-capacity environments(such as liquids),analyzing the effect of sensor packaging and filling material on the temperature response speed of the sensor,and designing and producing fast-responding FBG temperature sensors,including simulation verification and experimental testing.The results indicate that the designed sensor can achieve a temperature response time of 134 ms.(4)Finally,a real-time temperature monitoring interface system was developed using the Lab VIEW graphical programming language to facilitate practical applications in engineering.This work lays the foundation for expanding and deepening the use of fiber-optic grating temperature sensors and exploring their potential applications.