The Remote Monitoring System For The Equal Thickness Interference Experiment

Due to the fact that the experimental resources of traditional laboratories cannot be remotely operated,they cannot solve all-round open issues.The conventional Newton ring diameter measurement method consumes a long time,has a large measurement error and easily leads to eye fatigue.With thickness interference experiment as the experimental study,this article designs a network-based remote measurement and control system for equal-thickness interference experiments with controllability,visibility and data calculation functions.The main research contents of this topic are as follows.(1)Study on the automatic measurement method of the dark stripe diameter of Newton ring.In order to avoid the low precision due to the poor dark stripe in measurement and to maximize the simulation of traditional experimental steps,grading,filtering,binarizating,and extracting dark lines are performed on the two pictures with the center of the Newton ring located on the left and right sides of the field of view.Then,according to the moving distance corresponding to the two pictures,the number of pixels included in the multi-level Newton ring dark line diameter is measured.Finally,the corresponding true diameter is calculated according to the scale factor.(2)Research on remote operation of equal-thickness interference experiment.In order to solve the problem of remote monitoring the experimental environment and collecting the Newton ring images in remote observation,the image of experiment platform and Newton's ring collected by camera are transmitted to the web page for displaying in real time through the MJPG-streamer streaming media server.In order to solve the problem of real-time,reliability,and convenient operation in remote operation,a stepping motor closed-loop control method with a feedback mechanism is studied.By controlling the stepper motor remotely,the experimental instrument is operated,which simulate that the experimenter manually rotates the knob on the reading microscope.The remote interaction of the experimental data and the control command is realized through the MQTT communication protocol to realize the experimental operation control.The whole process of equal-thickness interference experiments can be successfully completed by using this system,the monitoring effects of Newton ring image is clear,and the error of curvature radius does not exceed 2.7%.The proposed system has realized the combination of traditional physics experiments and internet technology and supplemented and improved the remote experiment teaching platform.