Optimal Design Of Optical Fiber Sensor Measuring Three-dimensional Micro-surface Topography System

With the development of measurement technology,optical fiber sensors,as a new type of sensing technology,have received more and more attention in application fields such as the aerospace,national defence research,information technology industry,medical treatment,and industrial automation.As a non-contact sensing measurement technology,it has gradually replaced the traditional contact measurement method with its advantages of fast speed and non-contact,and has become the mainstream in the field of information sensing.In this paper,a set of reflective optical fiber displacement sensor measurement system is presented to realize the three-dimensional reconstruction of microscopic surface topography.The research content is as follows:(1)Analyze the theory of optical fiber sensor surface topography measurement.Based on the optical characteristics of the optical fiber,this paper studies the measurement principle of the optical fiber sensor,and explores the measurement principle of the reflection intensity modulated optical fiber sensor based on the optical characteristics of different probe structures.Analyze the specific factors that affect its performance,and finally summarize the measurement accuracy and stability of the system.(2)Design the light intensity compensation system.By analyzing the traditional light intensity compensation method and its light intensity compensation effect,the two-channel light intensity compensation method and the intelligent algorithm compensation method are advanced.The BP neural network is optimized by using the particle swarm and firefly intelligent algorithms respectively.The performance of light intensity compensation methods based on hardware and software is analyzed.(3)Construct a reflective optical fiber sensor surface topography measurement system.It mainly explains the hardware structure of the measurement system,as well as the basic characteristics of each part of the hardware and the selection of parameters.Based on the requirements of the system measurement function,the system control software is designed with the labview modular program.The experimental debugging ensures that the measurement system can work normally,and the calibration reduces the initial error.The performance of the system is optimized by the light intensity compensation method,and finally the influence of various measurement factors of the system is analyzed,and the three-dimensional surface micro-topography is measured and reconstructed.The research results show that the reflective optical fiber displacement sensor measurement system presented in this paper can realize three-dimensional micro-topography surface reconstruction and achieve high measurement accuracy.