3D Wind Speed And Direction Sensor Based On Bragg Grating

The influence of wind is involved in various fields of human activities,for example industrial and agricultural production,meteorological monitoring,energy development and utilization,as well as transportation industry and other fields.Due to the change of mountainous form,the wind has a vertical wind speed as well as a horizontal wind speed when the wind meets the mountain in the process of movement.In this situation,the wind speed should not be viewed roughly as a twodimensional but a three-dimensional vector.Most existing wind speed sensors are 2D wind speed and direction sensors,and there are few researches on 3D wind speed and direction sensors at home and abroad.It is not only necessary to consider the horizontal wind speed,but also need to consider the influence of the vertical wind speed for construction of roads,Bridges and transmission lines in the mountains.Aiming at the detection problem of threedimensional wind speed and direction in mountainous environment,this paper proposes a three-dimensional wind speed and direction sensor based on Bragg grating.The following are the main research contents: The structure optimization and force analysis of the windshield plate are carried out;the structure of Bragg grating wind speed sensor is designed;the principle of wind speed detection is modeled;the bragg grating wind speed sensor is realized to detect the positive and negative wind speed in one dimension.To research the change rule of the central wavelength of Bragg grating in wind field wind speed;the temperature compensation principle and algorithm of Bragg grating are studied.The temperature compensation of the wind speed detection grating is realized by the temperature compensation grating encapsulated in the base.The 3D modeling software UG is used to design the structural of the wind speed sensor.The mechanical simulation is carried out with ANSYS beam of equal strength,and the optimal bonding position and service life of the beam of equal strength are determined.Using Fluent to simulate the wind field of the windshield with different shapes.The structure of a rhomboid windshield plate was determined.In order to achieve three-dimensional wind speed and direction detection,three one-dimensional Bragg grating wind speed sensors were installed on the base for orthogonal array.Three-dimensional wind speed is decomposed into three onedimensional wind speed on X,Y and Z axes for detection and vector synthesis.Finally,the detection of three-dimensional wind speed and direction is realized.The sensor can identify the direction of the wind by detecting the positive or negative increase in Bragg grating wavelength,Then,the wind direction detection range of the wind speed sensor is expanded from 1/8 of the space to a full range of measurement.This greatly expanded the range of wind speed measurements.To verify the performance of the sensor,the temperature characteristic experiment of Bragg grating wind speed sensor was designed and completed.The wind speed characteristic experiment of horizontal,lateral and vertical direction of sensors was carried out by using the method of weight simulation of wind speed.Finally,it is verified by wind field experiment.The vector synthesis model and calculation method of 3D wind speed is studied and verified by experiments.The optimization of the experimental data shows that the Bragg grating based 3D wind speed and direction sensor on Bragg Grating designed in this paper can accurately detect the wind speed,3D wind direction and temperature in the wind field environment,which meets the expected requirements.