Font Size: a A A

The Application Of Remote Sensing FTIR In Toxic Organic Compounds Measurement

Posted on:2004-05-31Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z H HuangFull Text:PDF
GTID:1101360125453602Subject:Applied Chemistry
Abstract/Summary:PDF Full Text Request
This paper was discussed in the following:(1) Remote Sensing FTIR Emission technical become one of the very important means in analysis physical characteristic and chemical characteristic of IR emission of hot gases emission source, such as emissions of power plant, aircraft and engine exhaust gas. However, how to strictly predict IR emission source detail which can not be obtained or keep secret by army using emission law or published literature, have become susceptive and zealous topic to scientists and militarists who engaged in the research related to the field of IR. In order to obtain the infrared spectral radiance distribution of the emission spectrum, such as spectral radiant flux density, spectral radiant intensity, spectral radiance, spectral irradiance and emission radio of sample and combustion product concentration, instrument response function of the system is the indispensable basic parameter. This paper calibrated EQUINOX55 Remote Sensing FTIR emission system using different temperature of standard blackbody. The effects of the temperature of the standard blackbody for calibration of EQUINOX55 Remote Sensing FTIR Emission System on the instrument response function had discussed.The result illustrated that the values of the instrument response functions increased as the blackbody temperature increased when temperature fell to lower than 1073K, and tended to a limit when the temperature increased to higher than 1073K. However, the effects of the temperature of this standard blackbody for calibration of 170RS FTIR emission system that the instrument response functions fell as the blackbody temperature increased when temperature fell to lower than 600K. It was obvious that effects of the temperature of this standard blackbody for calibration of different remote sensing FTIR Emission System was different. Therefore, remote sensing FTIR emission system should be calibrated when we measure the infrared spectral radiance distribution of the emission spectrum or sample concentration.For calculate the instrument response functions and the infrared spectral radiance distribution of the emission spectrum expediently, we developed the software for calibrating FTIR system. This software had many advantages: it was not only quick and accurate in calculating, but also User Interface was so friendly and graphics was so beautiful. It would become a very powerful tool for scientists and militarists who engaged in the research related to the field of IR to calculate the infrared spectralradiance distribution of the emission spectrum and calibrate FTIR system.(2) Point sample data about the concentrations of gases cannot express the pollution state in terms of diffusion of deleterious gases from industrial source, distribution and diffusion and transition of polluting gases in city. A new technique about measuring the spatial dependence of gaseous species concentration had also been in development recently. This technique employs a combination of OP-FTIR remote sensing and Computed Tomography (CT). CT is a means of inverting a set of path-integrated measurements gathered in a plane to find the underlying spatial distribution of the parameter of interest (such as a gas concentration). The technique is helpful for monitoring of the spatial distribution of gases, evaluation of pollution transition, prewarning for guard lead and so on.The reconstruction method in this paper based on four kinds of interpolation methods, which need only much less the number of ray than the beams applied in previous studies using the Algebraic Reconstruction Technique (ART) and the Smooth Basis Function Minimization (SBFM) algorithm. The triangle-based cubic interpolation of path-integrated concentration was more accurate than other method, such as linear interpolation, nearest neighbor interpolation and v4 griddata method. Quantitative agreement between reconstruction results using the 'cubic' method and real measurements was generally good to within 5.3%. In addition, it avoids the complicated intersecting beam geometries a...
Keywords/Search Tags:Fourier Transform Infrared Spectroscopy, Remote Sensing, OP-FTIR,Instrument Response Function, Calibration, Computed Tomography, Grey System, GM Model, Air Pollution, Simultaneous Determination of Multicomponents, Artificial Neural Network Ensemble
PDF Full Text Request
Related items