Research On Gas Measurement Model Construction And Algorithm Fitting Based On Mass Spectrometry Measurement Equipment

Real-time observation and quantitative measurement of the trace gas permeation process in high-barrier films are the key to studying the water and oxygen barrier layer of flexible display devices such as OLED and QLED,and the hydrogen isotope barrier layer in controllable nuclear fusion devices.The barrier performance can provide support for the research and development of new barrier materials,manufacturing process iteration,and research on microscopic penetration mechanism.Based on the existing high-sensitivity trace gas permeation device of mass spectrometry,this paper has carried out research on the problems of single measurement parameter,long measurement period,and low accuracy existing in the current equipment: on the basis of the existing theoretical model,established the whole process of theoretical model including adsorption,dissolution,diffusion and desorption,etc.we also carried out microscopic mechanism research and nonlinear analysis to establish the relationship between macroscopic parameters and the microscopic properties of the material,so as to construct the physical model of the whole process of permeability;in addition,the input and conversion involved in the instrumental measurement process,The output link and the different measurement modes of the instrument determine the transmission model and measurement uncertainty of the instrument,and improve the measurement accuracy of the instrument by introducing variable period control;finally,based on the above-mentioned penetration model and signal Transfer model,developed a scalable sampling BP-neural network algorithm and a numerical solution-particle swarm optimization fitting algorithm,and assigned different fitting weights according to the signal-to-noise ratio of the signal at different stages,and successfully accelerated the measurement cycle by more than 70%.In addition,the algorithm is further extended and successfully applied to the actual F2 F laminated film,the fitting prediction of nanocomposite hydrogen barrier materials and the parameter fitting of the heat transfer process.This research is expected to realize the multi-parameter,fast and accurate measurement of the trace gas permeation process of high-barrier films,and provide experimental and theoretical support for the research of trace gas permeation laws and development of new materials.