共查询到20条相似文献,搜索用时 171 毫秒
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Zhao Min-jie Zou Ying Si Fu-qi Lu Yi-huai Wang Yu Wang Shi-mei Zhou Hai-jin Zeng Yi Liu Wen-qing 《光谱学与光谱分析》2015,(9):2578-2582
Space-borne differential optical absorption spectrometer is a nadir viewing wide field imaging spectrometer, which adopts two-dimensional CCD detector arrays. The pixel response non-uniformity exists in each column of spatial dimension, which will introduce high-frequency instrument-related spectral structures in the measurement data. However, the non-uniformity calibration of space-born imaging spectrometer is difficulty due to two factors: the spectral smile effect and the large field of view. For this reason, a method of non-uniformity calibration is discussed in detail. The result shows that the spectral smile effect and non-uniformity of full FOV image are corrected effectively, and high-frequency instrument-related structures in the measurement data are removed. 相似文献
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Yang Xian-hengFeng Guo-yingYi Jia-yuWang Shu-tongZhou Shou-huan 《光谱学与光谱分析》2015,(9):2483-2486
Thin films of Nd : YAG and Nd : Glass were prepared on Si (100) substrate by pulsed laser deposition technology. The morphology of film surface and cross section, composition, absorption spectrum and photoluminescence (PL) spectra of films were investigated by scanning electron microscope (SEM), energy disperse spectroscopy (EDS), Fourier transform infrared spectrometer(FTIR), optical parametric oscillator(OPO) and grating spectrometer. The results show that both Nd : YAG films and Nd : Glass films grown on the substrates at room temperature are amorphous. Nd : YAG films grown by PLD contain Nd element with 0. 15 at. % stoichiometric proportion. The absorption spectrum of bulk Nd : YAG target rather than deposited films exhibit two absorption peaks at 750 and 808 nm. There are no evident peaks in the photoluminescence spectra curve of Nd : YAG films. However, the photoluminescence spectra of Nd : Glass films with two sharp peaks at the wavelength of 877 and 1 064 nm are observed. It indicates that Nd is doped into glass host as optically active Nd3+ ions when Nd : Glass films grow at room temperature. But for Nd : YAG films, Nd don't incorporate into YAG host as Nd3+ ions. 相似文献
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In the field of petroleum exploration, lithology identification of finely cuttings sample, especially high precision identification of igneous rock with similar property, has become one of the geological problems. In order to solve this problem, a new method is proposed based on element analysis of Laser-Induced Breakdown Spectroscopy (LIBS) and Total Alkali versus Silica (TAS) diagram. Using independent LIES system, factors influencing spectral signal, such as pulse energy, acquisition time delay, spectrum acquisition method and pre-ablation are researched through contrast experiments systematically. The best analysis conditions of igneous rock are determined: pulse energy is 50 mJ, acquisition time delay is 2 mu s, the analysis result is integral average of 20 different points of sample's surface, and pre-ablation has been proved not suitable for igneous rock sample by experiment. The repeatability of spectral data is improved effectively. Characteristic lines of 7 elements (Na, Mg, Al, Si, K, Ca, Fe) commonly used for lithology identification of igneous rock are determined, and igneous rock samples of different lithology are analyzed and compared. Calibration curves of Na, K, Si are generated by using national standard series of rock samples, and all the linearly dependent coefficients are greater than 0.9. The accuracy of quantitative analysis is investigated by national standard samples. Element content of igneous rock is analyzed quantitatively by calibration curve, and its lithology is identified accurately by the method of TAS diagram, whose accuracy rate is 90.7%. The study indicates that LIBS can effectively achieve the high precision identification of the lithology of igneous rock. 相似文献
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利用固相反应法合成了FeSe超导体,根据名义组分和热处理工艺的不同共得到四组FeSe样品,利用X射线衍射仪(XRD)和物性测试系统(PPMS)分别对样品的晶体结构和电输运性能进行表征,并分析了磁通钉扎特性.XRD测试结果表明所有的样品主相均为β-FeSe四方相,同时在样品中也存在少量杂相,包括α-FeSe和Fe,不同名义组分和不同热处理工艺对晶体结构的影响较小.电阻率测试结果表明所有的样品均发生了超导转变,Tc大约为9K,在零场下的转变宽度约为3K,但是四个样品的正常态电阻率明显不同,通过测试四个样品在不同磁场下的电阻率随温度的变化曲线,随着磁场的增加,电阻率曲线出现展宽效应,分析表明FeSe的磁通钉扎行为是由于在不同磁场下热激活磁通蠕动引起的,其上临界磁场可达23T. 相似文献
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《原子与分子物理学报》2013,(1):172-172
<正>为适应我国信息化建设,扩大本刊及作者知识信息交流渠道,本刊已加入"万方数据千种精品核心刊"计划,被中国核心期刊遴选数据库收录,并通过万方数据资源系统及其镜像系统等对外提供无偿或有偿信息服务,其作者文章著作权使用费与本刊稿酬一次性给付.如作者不同意文章被收录,请在来稿时向本刊声明,本刊将作适当处理. 相似文献
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《强激光与粒子束》2015,(10):303-303
<正>本刊只接受原创性著作,所有稿件均将进行"学术不端"检索,请作者投稿前务必注意!投稿本刊的论文不得涉及国家秘密,若发生泄密问题,一切责任由著作人承担。投稿时务必附第一作者所在单位加盖单位公章的《保密审查证明》(或其他证明论文不涉及保密问题的材料)原件,本刊不接受无《保密审查证明》的投稿。《保密审查证明》原件请可用挂号邮件方式、EMS或其他快递等方式寄给编辑部。论文发表前作者须和编辑部签署《著作权让与合同》,该合同需全部作者逐一签名同意。凡投稿著作所有列名作者皆同意在投稿文章经本刊刊登后,其著作财产权即转让与《强激光与粒子束》编辑部,但作者仍 相似文献
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