Strain-temperature Fiber Optic Sensor CFRP Package And Device Design

In recent years,with the increase of wind power installed capacity,large-megawatt models have become the mainstream trend.During the 13 th five-year plan period,the key technologies of 8MW-10 MW land or offshore wind power units will be focused on,and the operation and maintenance difficulties and huge costs caused by blade length are urgently needed.Because of its light weight,small size,corrosion resistance,anti-electromagnetic interference,wide monitoring range,and the integration of sensing and signal transmission,optical fiber sensor has become an important competitive means for the online health monitoring of new-generation wind power blades.The survival rate of optical fiber on the blade,the compatibility with materials and the cross-sensitivity of strain and temperature are the main problems faced by the application of optical fiber sensing technology in the monitoring engineering of wind power blades.Based on the principle of fiber optic sensing,this paper designs the fiber optic fiber sensing belt which can measure the strain and temperature at the same time,and develops the automatic laying device of fiber optic fiber on the prepreg of carbon fiber,so as to promote the application of fiber optic sensing technology in the wind power industry.The paper is as follows:(1)Function design of fiber and carbon fiber bivariate measurement sensor.The application conditions,laying process and characteristics of the new fiber optic sensor are analyzed,the compatibility between the bare fiber and carbon fiber prepreg is studied,and the physical separation method of fiber temperature measurement and strain measurement is explored.The temperature measurement of the bending free fiber module and the bivariate measurement of the linear compression fiber module are realized by using the segmented encapsulation technology.In addition,this paper also explores the automatic placement process of the optical fiber sensor,and determines the relevant parameters that are the focus of attention in the design process of the automatic device.(2)Design of optical fiber path detection system.Considering that data reconstruction is required in the subsequent measurement of the sensor,the length of the fiber optic sensor embedded with CFRP is required to have a certain accuracy.Therefore,a path detection system based on machine vision is designed,which includes hardware design and software design.It mainly solves the measurement and positioning problems in the fiber path detection in the software design process.(3)Structure design of optical fiber laying head.According to the determined parameters and laying process,the overall design of the optical fiber sensor automatic laying device is carried out.According to the process design of the specific device,and then according to the specific scheme of structural design.Finally,the device consists of two parts: the laying head and the specific structure of the auxiliary part.(4)Experimental study on fiber placement.Through experiments,the feasibility of the device operation control was verified,and the measurement accuracy of the optical fiber path detection system based on machine vision was verified and error analysis was made.The final effect of the sensor characterization test,the test results show that the sensor measurement result conform to the requirements of the design,can solve the problem of optical fiber is sensitive to strain and temperature cross.