The Forward Study Of Passive Remote Sensing Detection Of Mines CO Gas Concentration And Temperature

In recent years,the frequent occurrence of coal mine accidents,casualties rising number after the gas explosion detection produces high temperature and high pressure,toxic gas is difficult,this paper presents a convenient and simple detection method for the detection of.Telemetry system temperature and concentration CO gas explosion in our research group designed a set of portable passive remote sensing of mine gas after based forward model and precision analysis this thesis mainly studies the set of telemetry system.This telemetry system s forward model can measure temperature by rotational line measurement method and measure concentration according to the certain function relationship between light intensity and concentration of monoxide by using imaging interferometer technique.When programming according to the 2nd rescue under different situations after the mine gas explosion,some hypothesis are set:the length and width are 4m,the gas concentration of CO is 4%,the temperature is 500K,the thickness of gas group was 4m,telemetry distance is 58m,the factors above in many aspects,and then combined with the forward formula of various models,finally derived the forward equation,using MATALB programming,get imaging interference graph,namely the forward simulation image.The image of forward modeling obtained six intensity of discrete spectral lines'electronic counting,the maximum signal to noise ratio is 268,when integration time is 300s,the maximum value of electronic counting of gas single intensity is 1.5×105,greater than 400 electronic counting dark noise of CCD we selected,and its noflowing artesian well quantity of electric charge less than 1×106,which is accord with detection range of detectors.A software of forward modeling which uses forward model program package to make an independent application program and makes forward program more transportability and easy operatingness is developed by using MATLAB.Finally,by comparing images,the effect of system accuracy is discussed and analysised,from several respects of the temperature and concentration of detectable gas,the volume of detectable gas source,transmission process,the whole detection system and so on.The precision value that is effected by the influence of each variable on the whole detection structure system was gained finally,and the sensitivity of detection system can be seen at the same time.By comparing the images with analyzing the factors which influence the detecting of the system like the temperature and concentration of the gas,the volume of detected source,transmitting and the detecting system.Eventually obtain the value of the influencing accuracy,to the whole detecting system;the sensitivity of the system is obtained at the same time.The detecting accuracy of temperature can reach 2K while the detecting accuracy of concentration is 0.01%.