Quantitative Analysis Of Influencing Factors And Interactions Of Thermal Radiation Polarization Of Water

The water is typical non-Lambert and the thermal radiation on its surface not only hasspatial distribution nature of multi-angle and multi-band, but also polarization. As a featuretype of the world’s most extensive coverage, the research of thermal radiation polarization ofwater becomes the frontier and hot issues of thermal infrared polarization remote sensing, butalso important theoretical basis of remote sensing interpretation.Previous measurement of the of thermal radiation polarization of surface features athome and abroad has carries out a lot of work, fully illustrating the important theoreticalsignificance and broad prospect of thermal radiation polarization remote sensing in the studyof earth observation. The analysis of thermal radiation polarization factors of typical featuresand the modeling study of thermal radiation polarization spectral as well as efficient andreliable spectral polarization detection system are still the focus of the research in this field. Inthe detection of thermal radiation polarization information of water, foreign scholars havecarried out exploratory research in this field for years and made some achievements, but stillneed more detailed quantitative studies. While the domestic nation has carried out lessresearch work in this field, still at primary stage. There is no published report at home andabroad on the quantitative analysis of influencing factors and their interactions of thermalradiation polarization properties of water. Therefore, it is necessary to carry out theexploration and research of thermal radiation polarization information to provide moretheoretical and technical support for the development of thermal infrared remote sensing.It makes analysis of the mechanism of thermal radiation polarization from the areas ofthe polarization generation, Fresnel formulas and Kirchhoff ’s law and other aspects in thispaper, and makes use of BPDF measurement platform(NENULGS), the thermal infraredradiometer, the thermal infrared polarizer, the standard mercury thermometer and otherinstruments to survey and evaluate the thermal radiation polarization characteristics of purewater, brine and soda water respectively at different detection angles, azimuth, bands,temperature and different physical and chemical conditions, and also makes comparativeanalysis of the commonalities and differences of thermal radiation polarization characteristicsbetween the three types of water in the same condition.Commonalities: the polarization brightness temperature decreases with increasingdetecting angle; the polarization brightness temperature presented parabolic distribution withthe changes of azimuth and the peak is near180°azimuth; the polarization brightnesstemperature increases with increasing temperature and reduces with increasing concentrations;the combination band data gets much law of the effect on the polarization brightnesstemperature with the changes of angle than a single band.Differences: the polarization brightness temperature is different and different sensitivitywith the variation of detecting angle and azimuth; the polarization spectral curve shape ofdifferent physical forms of pure water is different and it also varies with differentconcentration of brine and soda water. On the basis of spectral analysis, it makes analysis of the qualitative and quantitativerelationship of thermal radiation polarization information with different detection conditionsof the three types of water by the use of correlation analysis and regression analysisrespectively, and also the correlation between bands in different detection conditions. Itestablishes quantitative inversion one-dimensional, two-dimensional and multivariatestatistical regression models of water temperature and concentration of brine and soda byusing the least squares and stepwise regression analysis.In addition, the orthogonal experiments are designed to qualitatively analyze the primaryand secondary effects on the thermal radiation polarization properties of water between thesefactors and their interactions and make quantitative analysis of the significance of thesefactors and their interaction effect on the thermal radiation polarization characteristics ofwater. By comparison, it also has commonalities and differences between the factors and theirinteractions affecting on the thermal radiation polarization properties of the three types ofwater in the same condition.Commonalities: the main factors or interactions of thermal radiation polarizationcharacteristics are basically the same under different polarization conditions of the same waterand the results of quantitative analysis are consistent; the polarized radiance of water is verysensitive to the band and the polarization brightness temperature is very sensitive totemperature; the quantitative analysis results of the thermal radiation polarization influencingfactors and their interactions of brine and soda water are the same; the azimuth has lowerinfluence on the thermal radiation polarization properties of water and does not havesignificant impact.Differences: the influence of different factors and their interactions on the thermalradiation polarization properties of the three water is different; the effect of the interactionsbetween factors on the thermal radiation polarization properties of pure water is extremelysignificant and the impact of interactions on brine and soda water is not significant; there aremany factors significantly affected on the thermal radiation polarization properties of purewater while the significant factors affecting brine and soda water are less; in the research ofpure water, there is commonality of its quantitative analysis by different evaluation indicators,but the results obtained in brine and soda water are different; the concentration on the thermalradiation polarization properties varies between brine and soda water. In short, thequantitative analysis of the influencing factors and their interactions on the thermal radiationpolarization of brine and soda water is the same and it is significantly different with the resultof pure water. In the applications of remote sensing, the three types of water can be separatedby the use of a level combination of different factors.In practical remote sensing applications, these common features and differences lawsshould be taken and used to provide a basis for the identification and classification in thethermal radiation polarization remote sensing of water, ever since the thermal radiationpolarization characteristics and the factors and their interactions on the thermal radiationpolarization properties have commonalities and differences.The combination of multi-angle information, multi-band information and polarizationinformation of thermal infrared band contributes to mining more methods conducive to the identification, classification and quality parameters inversion of water, providing newtechniques for the water remote sensing monitoring. On the basis of data obtained in thisstudy, it provides reference for the model study of thermal radiation polarization spectralcharacteristics of the water and the corresponding thermal radiation polarization remotesensing applications, having important theoretical significance and practical value.