Development Of A Visual Measuring Instrument For The Height Parameter Of Fire-resisting Plate

The corrugated flame arrester is the key to the flame arrester to prevent the spread of flammable gases or liquid flames.The existing flame arrester measurement systems on the market require manual measurement.Due to the large number of pores in the flame arrester,it is easy to cause time-consuming and laborious errors Large,high cost of measurement(including labor)and other issues.In view of the above situation,a visual measuring instrument based on image processing technology for the flame retarder wave height parameter is developed.The main research work is as follows:Firstly,by analyzing the morphological characteristics of the surface of the flame arresting disk,a scheme for measuring wave height parameters using a linear array industrial camera and image processing technology is proposed.The overall design of the visual measuring instrument for the wave height parameter of the flame arresting disk is clarified,the design principle of the automatic measurement of the wave height parameter is clarified,the technical indicators are determined,and the detailed working procedure of the measuring instrument is introduced.Secondly,the electromechanical control system of the fire-resistance plate wave height parameter visual measuring instrument is designed.The design principles of the mechanical structure module and the circuit control module are introduced separately.Among them,the mechanical structure module adopts a gantry-type detection bracket,which fixes the camera and the linear array light source in order to acquire the image of the flame arrester in motion.According to the actual measurement of the diameter of the fire-resistant disc and the measurement index,the two-dimensional electric stage is selected and an algorithm for automatically planning the measurement path is designed.Thirdly,the algorithm for measuring the height parameters of the flame arresting disk is designed and developed.The algorithm has calibrated the line array camera successively,stitched the fire retardant disc line array images,and optimized and improved the image stitching algorithm based on FLANN,using image preprocessing techniques(image enhancement,image segmentation,morphology Processing)Obtain the complete contour of the corrugated triangle,straighten the corrugated triangle image and use the sub-pixel edge detection method to accurately obtain the location of the corrugated triangle edge,and calculate the wave height parameter pixel size and actual size of each corrugated triangle according to the wave height measurement principle and the least square method.Furthermore,the software of the visual measuring instrument for the height parameter of the fire-resisting plate was developed.The fire resistance plate wave height parameter visual measurement software is developed and implemented in the MFC module of VS2010.At the same time,the host computer software calls the Open CV dynamic link library to embed the wave height parameter measurement algorithm in the measurement software.The lower computer is a two-dimensional electric stage controller.Communication between the upper and lower computers is established through USB to serial port,and automatic measurement is realized.Finally,experiments are performed on two types of flame arresters with different diameters,and the experimental results are compared with the measurement results of a more accurate imager.The experimental results show that the measurement error of the height of each flame arrester is less than 0.02 mm,and the measurement efficiency is higher.At the same time,the second-degree block is also used to analyze the measurement uncertainty of the flame arrester wave height parameter visual measuring instrument.The second-degree block is corresponding to the standard measurement uncertainty value by polynomial fitting to Standard measurement uncertainty and extended uncertainty for predicting actual wave height parameters.