共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
黑白CCD摄像机的近红外特性和应用 总被引:4,自引:0,他引:4
本文对黑白CCD摄像机的光谱响应特性进行了具体的分析,讨论了近红外光谱特性和低照度下CCD摄像机的光谱响应之间的关系,介绍了在低照度下和近红外照明下,黑白CCD摄像机的使用条件。 相似文献
3.
便携式近红外光谱分析仪的研制及应用 总被引:2,自引:0,他引:2
针对野外和现场快速无损分析应用,研制了一种便携式近红外光谱分析仪。该仪器具有体积小、结构简单、响应速度快、功耗低、抗震性好、使用方便和维护成本低等优点。详细描述了仪器的总体设计及主要结构,展现了其性能特点。对仪器进行了性能测试,结果显示该分析仪性能稳定,已达到了国际同类仪器水平。苹果糖度的现场无损测定数据表明,该分析仪具有较强的建模能力及高可靠性,其中校正标准偏差和验证集预测标准偏差分别为0.266和0.309。实验结果表明,该分析仪具有较强的现场应用能力,能够适应各种现场的应用环境。 相似文献
4.
5.
To support the interpretation of remote sensing instruments that use water features near 0.94 μm, the water vapor line parameters have been measured using 16 laboratory spectra of pure water and 9 spectra of water+air mixtures recorded at resolution 0.012 and 0.02 cm−1 with the McMath Fourier transform spectrometer at the National Solar Observatory located at Kitt Peak. Over 3300 line positions and intensities between 9 650 and 11 400 cm−1 and 507 air-broadened widths and 462 pressure-induced shifts in positions between 10 150 and 11 190 cm−1 have been obtained at room temperature for the main isotopomer, H216O. The numbers of width measurements involving the parallel bands are 108 for (121), 192 for (201), and 86 for the (003) upper states; for the perpendicular bands, the numbers of widths are 4 for (022), 78 for (300), and 38 for the (102) upper states. These empirical values have been combined with calculated positions and intensities of H218O and H217O and with available broadening coefficients from other spectral regions to form a new composite database. The sum of 5002 transition intensities for the region is 0.6417 cm−2·atm−1 (2.588×10−20 cm−1/(molecule·cm−2)) at 296 K. This new compilation appears in the 2000 edition of HITRAN. 相似文献
6.
临近空间平台光电探测系统在空间态势感知中的应用 总被引:1,自引:0,他引:1
介绍了空间态势感知的概念,以及地基、天基光电探测系统和临近空间平台的特点及研究现状,对不同平台光电探测系统的性能与特点进行了分析。分析表明,地基光电探测系统的观测质量受地球大气湍流和大气吸收的影响,有其极限探测能力,且大部分大气扰动发生在大气最底层的对流层;天基光电探测系统虽然可不受大气湍流的扰动,但光电探测平台的探测时间只有地基望远镜的1/3,且耗资巨大;临近空间平流层平台(飞艇)光电探测系统不受对流层大气扰动的影响,其分辨力可显著提高,并且具有灵活布站等优势。基于临近平台光电探测系统的优势,综述了发展临近平台空间光电探测系统的可行性,归纳总结了将其应用于空间态势感知的技术要求,涉及材料、控制、能源和高能物理等。 相似文献
7.
Eiji Okada 《Optical Review》2000,7(5):375-382
Near infrared spectroscopy and imaging have been used in measurements of brain activity. The scatter of light in biological tissue which causes ambiguity in the volume of tissue interrogated with near infrared instruments is a serious problem for near infrared spectroscopy and imaging. The heterogeneity of superficial tissue of the head, especially the presence of non-scattering clear cerebrospinal fluid, affects the light propagation in the brain. In this paper the theoretical results of the effect of superficial tissue on the spatial sensitivity profile in the head for near infrared spectroscopy and imaging are reviewed. Simplified homogeneous and heterogeneous models are used to investigate the effect of the non-scattering clear layer on the spatial sensitivity profile in the head. Time resolved spatial sensitivity profiles reveal the effect of this layer on the early and late detected light. Finally, the author presents the spatial sensitivity profiles in the sophisticated adult and neonate head models to discuss the effect of superficial tissue on the near infrared measure of brain activity bydetecting the two heads. 相似文献
8.
红外隐身技术的应用及发展趋势 总被引:1,自引:0,他引:1
从斯忒藩-波尔兹曼定律出发,阐述了红外隐身的基本原理,分析得出实现红外隐身的几种方法。介绍了红外隐身材料的作用机理,指出了目前这些材料存在的主要问题,然后描述了红外隐身技术在军事上的具体应用和研究进展,总结了红外隐身技术的未来发展趋势。最后,指出今后的研究将主要在以下两方面展开:一是寻求全波段多隐身技术的兼容;二是对现有方法进行改进并探索新的红外隐身方法。 相似文献
9.
Xingyuan Guo 《中国物理 B》2022,31(10):108201-108201
As the global energy crisis and environmental pollution problems become increasingly severe, it is important to develop new energy capture and pollution management methods. Among these new technologies, photocatalysis has garnered significant interest because of its significant application prospects in harnessing pollution-free solar energy to degrade organic pollutants. From a fundamental scientific and technical perspective, improved optical frequency is a key research topic that provides a useful framework for studying the optical processes impacted by the local photonic environment. This type of study is especially pertinent because plasmonics emphasizes nonlinearity. Thus, near-infrared (NIR) catalysis has received considerable attention. In this review, we aimed to provide an integrated framework for NIR photocatalysis. We briefly introduce photocatalysis based on upconversion (UC) materials, including the efficiency of UC materials and the bination and energy transfer process between the semiconductor and UC particles as well as photoelectric response photocontrolled-delivery and photodynamic therapy based on NIR-responsive materials. 相似文献
10.
Abstract Honey is a carbohydrate-rich syrup and viscous fluid produced by honeybees (Apis mellifera) from the nectar of flowers that, by definition, does not include any other substances. Honey is produced primarily from floral nectars, and fructose and glucose are the major components. Overall, the chemical composition of honey varies depending on plant source, season, production methods, and storage conditions. Analytical methods applied to honey generally deal with different topics such as determination of botanical or geographical origin, quality control according to the current standards, and detection of adulteration or residues. Traditional chemical composition analysis and physical properties assessment are routinely performed in commercial trading of honey using time-consuming analytical methods that require considerable sample preparation and analytical skills. Spectroscopic techniques in the infrared (IR) wavelength region of the electromagnetic spectrum have been used in the food industry to monitor and evaluate the composition of foods and are becoming one of the most attractive and commonly used methods of analysis. This review discusses the use, with advantages and limitations, of IR spectroscopy technologies to evaluate and monitor the composition of honey. 相似文献
11.
The progress in the quantum well infrared photo-detector (QWIP) based on quantum confinement in semiconductor in recent 10
years has been reviewed. The differences between QWIP and the HgCdTe (HCT) infrared detector as well as their compensation
are analyzed. The outlook for near-future trends in QWIP technologies is also presented.
Supported by the National Natural Science Foundation of China (Grant Nos. 10474020, 10734090, and 60221502) and the Key Program
of Basic Research of China (Grant No. 2004CB619004) 相似文献
12.
13.
14.
15.
16.
红外光探针是扫描近场红外显微镜(SNIM)中的关键部件,由于探针的种类和材料不同,制作的方法也不同.一般制作光纤探针有两种方法,即热拉伸法和化学腐蚀法.这里叙述了一种化学腐蚀方法,介绍了怎么去除砷硒碲中红外光纤的聚酰胺表层和硫化硒夹层,以及芯层腐蚀成针尖状的具体方法和过程,并对短锥针探针制法进行了探索.最后用此探针在近场范围内探测了氮化镓样品的自由电子激光(FEL)反射谱.
关键词:
扫描探针显微镜(SPM)
近场红外扫描显微镜(SNIM)
光纤探针 相似文献
17.
Zuguang YAO Zhonghua ZHUBesearch Znstitats of Fine Chemicals of the East China University of Ohemical Technology Shanghai ChinaLvn YE Xiangchun YANG Shanghai Institute of Optics Fine Mechanics Academia Sinica Shanghai China 《Chinese Journal of Lasers》1992,1(1):17-21
In this paper, the characteristics of three novel near infrared laser dyes withwide-tuning ranges and high conversion efficiency are reported. The tunable spectral regions ofthese dyes pumped by the second harmonic pulse(532nm)of Nd: YAG laser are from 700nmto 900nm with a conversion efficiency between 6.6% and 9.0%. The aborption spectraand fluorescence spectra of these dyes are also given. 相似文献
18.
The recent progress of coherent optical fibre communication systems is reviewed. System constituent technologies, such as coherent optical modulation-demodulation, optical direct amplification for repeaters and single polarization fibre transmission are outlined. Several important optical device technologies, such as frequency stabilization of semiconductor lasers, AM and FM quantum noise and their reduction, and integrated opto-electronic devices, are also described. Finally, on the basis of the current state of the art in these technological areas, the expected system performance and future problems are discussed. 相似文献
19.
20.
BN纳米管——一种新型的纳米材料 总被引:1,自引:0,他引:1
文章综述了BN纳米管的最新进展,介绍了BN纳米管的结构和制备技术发展情况,包括电弧放电,电弧熔融,激光烧蚀,机械球磨,碳纳米管取代反应答经学反应法,探讨了BN纳米管的机械和电学性质,并展望了BN纳米管的应用前景,提出了BN纳米管的发展方向。 相似文献