| This paper presented the advantages of modern spectroscopy applications of remote sensing Fourier Transform Infrared (FTIR) spectroscopy and atomic emission spectroscopy in temperature measurements and air organic pollutants monitoring as a sensitive technology, especially combined with other analytical methods. The applications of remote sensing FTIR coupled with molecular spectra theory in combustion characteristics under high temperature and high pressure were investigated for the determination of combustion temperature of solid propellant. The influence of Blackbody temperature on the instrumental response function was studied to measure the energy distribution of the infrared emission spectra from the combustion flame, thereby quantified the combustion products concentrations. A multi-component analytical platform including Classical Least Squares (CLS), Partial Least Squares (PLS), Kalman Filter Method (KFM) and Artificial Neural Network (ANN) was established to overcome the overlaps between the spectral bands of each component in air Volatile Organic Compounds (VOCs) monitoring. The Open-Path real time air pollutant monitoring of remote sensing FTIR was conducted for the two-, three- four-and five- component system, herein the Path-Integrated Concentrations (PIC) of the desired VOCs leaking from the simulated source vs. the leaking time were obtained. Moreover, the concentrations of chloroform and methanol were spatially mapped in the vertical direction and on the horizontal plane during the quasi-steady state. The atomic emission spectroscopy with multiple spectral lines was used to measure the electro-thermal plasma temperatures and electronic density, and the influence of spectral parameters on the measurement accuracy was evaluated. This study will play significant influence on techniques of temperature measurement and air contaminant monitoring. The major content was described as follows:1. The Real Time Measurement of Combustion Characteristics of Solid Propellant by Remote Sensing FTIRThe superiority of theory of molecular rotation-vibration emission spectra for the temperature measurement was verified. The in-situ combustion temperatures of solid propellant I and II were measured by Remote sensing FTIR combined with molecularrotation-vibration emission spectra method and maximum spectral line intensity method. The results of molecular rotation-vibration emission spectra method and maximum spectral line intensity method were hi great agreement. Moreover, the optics of remote sensing FTIR used was calibrated, and the instrumental response function (IRF) was introduced and analyzed. Thus, the energy distribution of infrared emission spectra of the solid propellant combustion flame was measured.2. Studies of Four Chemometrics in the Simultaneous Determination of Air Toxic VOCsA chemometrics analytical platform was established to overcome the spectra interference and overlaps between the spectral bands of each component when doing multicomponent analysis of 1, 3-butadiene, benzene, o-xylene, chlorobenzene and acrolein. The methods included CLS, PLS, KFM and ANN. PLS was found to be the most potential method by comparing the prediction errors of each method. As for prediction samples, in which some unknown interferents exist, the modified PLS method successfully identified the interferents and corrected the spectrum, thus the concentrations of each desired component was quantified successfully. Moreover, ANN was applied to a ten-component system, results showed that the characteristic peak selection method was better than the equi-spaced wavenumber selection method when composing the analytical samples.3. Temporally Monitoring Air Toxic VOCs by Remote Sensing FTIR and ANNThe simulated leaking sources composed of two-, three, four- and five VOCs were monitored by remote sensing FTIR with ANN as a quantification tool. The measured VOCs include chloroform, methylene chloride, acetone, methanol, hexane and butanol, etc. The plot of Path-Integrated Concentrations...
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