Research On Metallized Fiber Bragg Grating Stress Sensor In The Shape Measuring Roll

The shape measuring roll is a key equipment for metal plate rolling production.The accuracy of the measurement of plate shape determines the control accuracy of the whole rolling line and is the key to ensure the quality of the strip.At present,the most widely used plate shape measuring technology is mostly monopolized by foreign countries,and the development of high-precision plate shape measuring roll with independent intellectual property rights has become an urgent need.There are a wide range of technical routes for plate shape measuring roll,and most of them require built-in supporting electronic circuits to assist in the measurement,processing,or transmission of data.Despite the relative maturity of electronic sensor technology,its vulnerability to electromagnetic interference in the production environment has not been solved.Based on the characteristics of high sensitivity and electromagnetic interference resistance of fiber Bragg grating sensing technology,this paper proposes a solution to apply metallized fiber Bragg grating(MFBG)to the field of cold rolled plate stress detection.According to the actual requirements of the working environment for cold rolled plate shape measuring roll,the following theoretical research,model design,simulation calculation,and experimental verification have been carried out in this paper:Firstly,the temperature and stress sensing principles of fiber Bragg grating is analyzed theoretically.Combined with the influence of metallization coating on the strain sensing characteristics of fiber grating,the strain transfer law under adhesive packaging is demonstrated.The above research provides theoretical support for designing sensor structures based on metallized fiber Bragg grating.Secondly,according to the actual requirements of the shape measuring roll structure and sensor installation,the non-through shape measuring roll prototype and the embedded stress sensing unit are designed;The stress analysis of the elastic metal disc in the sensing unit similar to the beam structure is carried out;Based on the finite element algorithm,the stress sensing characteristics of the sensing unit are simulated,and the calculation process of two temperature compensation decoupling methods are explored.Finally,the metalized fiber Bragg grating stress detection sensor is calibrated in a laboratory environment to analyze its temperature and stress sensing characteristics.The correctness of two temperature compensation methods is experimentally verified.And the stress sensing performance of the sensor is experimentally analyzed under the rotation of the shape measuring roll prototype.This paper proposes a contact optical stress detection scheme for cold-rolled plate based on metallized fiber Bragg grating to address the problem of susceptibility to electromagnetic interference in the electronic sensing schemes of the shape measuring roll.The designed sensor has the advantages of large range,easy installation and high reliability.This scheme provides a new design direction and ideas for the development of the shape measuring roll with independent intellectual property rights,and has certain reference value for advancing the research and development of the plate shape detection technology.The experimental results indicate that the application research scheme combining fiber grating sensing technology with cold rolled plate shape detection technology is feasible.