The present study theoretically explored the feasibility of the capillary method for measuring near-infrared (NIR) spectra of liquid or solution samples with microlitre volume, which was proposed in our previous studi...The present study theoretically explored the feasibility of the capillary method for measuring near-infrared (NIR) spectra of liquid or solution samples with microlitre volume, which was proposed in our previous studies. Lambert-Beer absorb- ance rule was applied to establish a model for the integral absorbance of capillary, which was then implemented in numerical analyses of the effects of capillary on various spectral features and dynamic range of absorption measurement. The theoretical speculations indicated that the capillary method might be used in NIR spectroscopy, which was further supported by the empirical data collected from our experiments by comparison between capillary NIR spectra of several organic solvents and cuvette cell NIR spectra.展开更多
In the face of deteriorating environmental conditions in the world,water quality control is an urgent task.It can be solved by creating sensors with high accuracy and low cost,which requires the development of fundame...In the face of deteriorating environmental conditions in the world,water quality control is an urgent task.It can be solved by creating sensors with high accuracy and low cost,which requires the development of fundamentally new radiophysical methods that take advantage of the optical,microwave and millimeter wavelengths that have a significantly greater sensitivity to low concentrations of pollutants and a lower inertia.The article presents prototypes of measuring cells of the microwave and optical ranges as well as the results of an experimental study of water of various degrees of pollution with their help.The results show that the use of the highly sensitive method of capillary-waveguide resonance makes it possible to detect the presence of micro impurities in water with concentrations up to0.1%and to identify water even from sources of various natural origins.In addition,the use of measurements at several frequencies in the optical range will make it possible to solve the problem of creating water control sensors with high sensitivity to pollution and low cost.It can be concluded that the possibility of complex use of multiwave sensors(optical,infrared and microwave ranges)allows to increase the sensitivity and reliability of water quality assessment.展开更多
利用整体毛细管X射线半会聚透镜对同步辐射X射线进行聚焦,经透镜会聚的微焦斑直径在10μm量级,焦斑位置处的功率密度增益在10^3量级.在5.5—11.5keV能量范围内,透镜焦斑直径由38μm变为29μm,透镜传输效率由26.1%变为20.5%,焦斑的中心...利用整体毛细管X射线半会聚透镜对同步辐射X射线进行聚焦,经透镜会聚的微焦斑直径在10μm量级,焦斑位置处的功率密度增益在10^3量级.在5.5—11.5keV能量范围内,透镜焦斑直径由38μm变为29μm,透镜传输效率由26.1%变为20.5%,焦斑的中心位置移动了3μm;透镜的出口焦距变化了155μm.在上述透镜性能研究的基础上,研究了该微焦斑同步辐射在微区EXAFS（Extended X-ray Absorption Fine Structure）分析技术中的应用.展开更多
文摘The present study theoretically explored the feasibility of the capillary method for measuring near-infrared (NIR) spectra of liquid or solution samples with microlitre volume, which was proposed in our previous studies. Lambert-Beer absorb- ance rule was applied to establish a model for the integral absorbance of capillary, which was then implemented in numerical analyses of the effects of capillary on various spectral features and dynamic range of absorption measurement. The theoretical speculations indicated that the capillary method might be used in NIR spectroscopy, which was further supported by the empirical data collected from our experiments by comparison between capillary NIR spectra of several organic solvents and cuvette cell NIR spectra.
文摘In the face of deteriorating environmental conditions in the world,water quality control is an urgent task.It can be solved by creating sensors with high accuracy and low cost,which requires the development of fundamentally new radiophysical methods that take advantage of the optical,microwave and millimeter wavelengths that have a significantly greater sensitivity to low concentrations of pollutants and a lower inertia.The article presents prototypes of measuring cells of the microwave and optical ranges as well as the results of an experimental study of water of various degrees of pollution with their help.The results show that the use of the highly sensitive method of capillary-waveguide resonance makes it possible to detect the presence of micro impurities in water with concentrations up to0.1%and to identify water even from sources of various natural origins.In addition,the use of measurements at several frequencies in the optical range will make it possible to solve the problem of creating water control sensors with high sensitivity to pollution and low cost.It can be concluded that the possibility of complex use of multiwave sensors(optical,infrared and microwave ranges)allows to increase the sensitivity and reliability of water quality assessment.
文摘利用整体毛细管X射线半会聚透镜对同步辐射X射线进行聚焦,经透镜会聚的微焦斑直径在10μm量级,焦斑位置处的功率密度增益在10^3量级.在5.5—11.5keV能量范围内,透镜焦斑直径由38μm变为29μm,透镜传输效率由26.1%变为20.5%,焦斑的中心位置移动了3μm;透镜的出口焦距变化了155μm.在上述透镜性能研究的基础上,研究了该微焦斑同步辐射在微区EXAFS（Extended X-ray Absorption Fine Structure）分析技术中的应用.
