A Fiber Bragg Grating-based Wind Erosion Monitoring System

Soil wind erosion is one of the important reasons for the destruction of the global ecosystem,and has a strong impact on human survival and development.In order to better satisfy the needs of human living and development,stable and reliable means of wind sand monitoring have important research significance.Fiber Bragg Grating(FBG),as a new type of passive device,is widely used in modern monitoring systems due to its small size,resistance to electromagnetic interference,corrosion resistance,long transmission distance,large transmission capacity and so on.Therefore,applying it to the wind sand monitoring system designed by this subject can bring new vitality to the field of wind sand monitoring.At present,there are two main methods of sand monitoring.One is the traditional manual monitoring method,which has the disadvantages of high labor intensity,inability to obtain data in real time,and has errors in the process of sand extraction and weighing.The other is electronic monitoring method,which has problems such as difficulty in field power supply and wiring,susceptibility to electromagnetic interference,and easy damage to electronic devices.Both methods limit its application scope.Both methods limit its scope of application.With the rapid development of the Internet of Things,the demand for intelligent access to wind sand monitoring data is increasing.Therefore,it is of great practical value to develop a intelligent wind sand monitoring device.This paper focuses on the design and implementation of the fiber grating-based wind sand monitoring system and starts research and development work.The main research contents and achievements are as follows:1.Based on the three principles of airflow split hedging,capacity expansion and speed reduction,and cyclone separation,a sand collector with multiple speed reduction processes is developed.Combining software simulation and test analysis,the speed reduction performance of the sand collector is optimized.Experiments show that the average deceleration ratio of the sand collector is 94.8%.2.An optical fiber passive load cell based on tipping bucket is designed.The performance of the cantilever beam is optimized through modeling.The structure and size of the cantilever beam suitable for this subject are selected to improve the measurement accuracy of the optical fiber passive load cell.Based on the OS3100 fiber grating strain gauge,the weighing sensor designed in this subject has a measurement accuracy of 8.87g and good linearity,which can realize long-term and real-time measurement.3.A fiber-optic wind and sand monitoring system is designed,and the assembly structure of the system is designed through modeling.Through the actual system construction and operation tests,the average isokinetic performance of the wind sand monitoring system is 92.7%,and the average sand collection efficiency is 92.78%under the wind speed of 9 to 12 m/s.The performance of anti-vibration,anti-shaking and anti-temperature performance are good,which shows that the system has high stability and small error.