共查询到18条相似文献,搜索用时 437 毫秒
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国内已知的红外星库数量有限,辐射照度、覆盖波段范围小,分布密集度低,无法满足现有地基红外辐射测量系统天文标定的需要。根据系统的探测波段考察并选取IRAS、2MASS、WISE、AKARI 4个全空域巡天计划及其生成的红外星表。综合考虑大气弥散、大气衰减的影响,分析计算系统在短波红外1~3 m、中波红外3~5 m、长波红外8~10 m的极限探测能力及在对应点源星表中的最低可探测的星等。搜索选取可供系统观测的恒星,结果显示在短波选取4 599个恒星目标,中波选取125个恒星目标,长波选取1个恒星目标,为我国现有地基红外辐射测量系统天文标定及红外星表进一步应用提供理论依据。 相似文献
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本文首先介绍了美国战略防御计划对红外探测系统的要求,指出现有的红外扫描系统不能满足战略防御任务的需要,必须采用红外焦平面阵列。然后介绍了红外焦平面阵列的优点及目前的进展,强调了红外焦平面技术已成为战略防御计划的关键技术之一。 相似文献
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机载激光红外对抗的现状和发展趋势 总被引:13,自引:1,他引:12
评述了红外探测器和红外导弹的发展,讨论和分析了激光红外对抗系统的原理,组成,关键技术及取得的重大进展。还介绍了美国定向红外干扰计划和最近进行的演示试验,最后得出了几点结论。 相似文献
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概述了美国定向红外干扰技术的原理、特点,并较为详细地介绍了美国定向红外干扰技术的发展过程、研制计划以及在军事上的应用,最后指出了美国定向红外干扰技术的发展趋势。 相似文献
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论述了舰载红外搜索和跟踪系统的地位、作用及发展状况,重点介绍新一代系统的技术特点,最后简介了一些国家的研制计划。 相似文献
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A. I. Harris 《Journal of Infrared, Millimeter and Terahertz Waves》1988,9(3):231-247
Submillimeter receivers which operate in the highest frequency atmospheric windows must still be mounted on large infrared and optical telescopes. Finding the optimum submillimeter wave illumination for these large telescopes is simplified by their effectively perfect optical surfaces and long focal lengths, but is complicated by telescope optics which have been optimized for non-tapered beams. In order to determine the effects of changing illumination edge taper, we calculated idealized aperture and beam efficiencies for telescopes which are used for submillimeter astronomical observations. The optimum illumination edge taper for the large infrared telescopes is near 10 dB, somewhat less than for classical radio telescopes, and is not very critical as long as it is between 10 and 13 dB. We also present an accurate method for measuring the sizes of, and deviations from, Gaussian beam pattern distributions by using astronomical sources which have sizes comparable with the beam. 相似文献
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ASTER Level-1 data processing algorithm 总被引:1,自引:0,他引:1
The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is an advanced multispectral imager with high spatial, spectral, and radiometric performance built for the EOS-AM1 polar orbiting spacecraft. ASTER covers a wide spectral region from visible to thermal infrared with 14 spectral bands. To meet this wide spectral coverage, ASTER has three optical-sensing subsystems: visible and near-infrared (VNIR), shortwave infrared (SWIR), and thermal infrared (TIR). In addition, the VNIR subsystem has two telescopes (nadir and backward telescopes) for stereo data acquisition. This ASTER instrument configuration with multitelescopes requires highly refined ground processing for the generation of Level-1 data products that are radiometrically calibrated and geometrically corrected. The algorithm developed for the ASTER Level-1 data processing is described 相似文献
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针对目前地基空间探测红外成像系统对高灵敏度、高探测能力及信噪比的要求,对地基冷光学红外成像技术进行了研究,包括红外杜瓦冷却系统内部辐射抑制、系统终端快速制冷、低温红外探测器的研制、低温冷光学系统设计装调等关键技术。在各项系统技术突破的基础上,研制出一套相对孔径1:10、分辨率320256、兼容中波3~5 m和长波8~10 m波段的冷光学红外成像终端。系统终端实现制冷温度最低至42 K,真空度10-5 Pa量级。将终端与1.23 m口径地基望远镜对接,对月亮和红外标准星观测具有良好的成像效果。该系统的研究为地基大口径冷光学红外探测技术提供参考。 相似文献
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以制冷技术在空间红外望远镜中的应用作为出发点,详细分析了目前国外最先进的三个空间红外望远镜(SIRFT、ASTRO-F、WISE)的红外光学系统所采用的制冷方式和关键技术,论述了制冷技术对空间红外光学系统的重要性及其发展趋势.通过对不同制冷方式进行优缺点分析和可行性论证,得出了发展我国空间红外光学系统制冷技术的必要性与... 相似文献
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空间红外望远镜的成像质量依赖着低温深冷的环境。在这种环境下,对反射镜的结构及其支撑结构都提出了严格的要求。介绍了当前国内外望远镜的被动支撑结构(如bipod、hexapod和whiffle tree结构),然后对国内外望远镜的主动支撑结构形式和促动器的原理进行了分析说明。通过对国内外望远镜主、被动支撑结构的分析,对二者进行了对比,并指出了它们的优缺点以及各自适用的领域。提出了两种实现无热化支撑结构的方法:对于拼接式望远镜,采用whiffle tree结构和促动器的组合支撑形式;对于单块式望远镜,采用whiffle tree结构和A frame结构并搭配促动器的支撑形式。 相似文献
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A. I. Harris D. T. Jaffe J. Stutzki R. Genzel 《Journal of Infrared, Millimeter and Terahertz Waves》1987,8(8):857-883
The UCB/MPE Submillimeter Heterodyne Spectrometer is a system for ascronomical spectroscopy in the high-frequency atmospheric windows from 500 to 1000 GHz. It contains a molecular laser local oscillator, a cooled Schottky open structure mixer, a quasi-optical coupling system, and an acousto-optical spectrometer. The compact receiver mounts at the Cassegrain focus of large infrared astronomical telescopes. The receiver noise temperature on the telescope is approximately 3500 K (DSB) during observations of the CO J=7→6 line at 806.652 GHz. The spectrometer's frequency resolution and instantaneous bandwidth (<2 MHz resolution across 1.1 GHz) are well suited for observations of molecular emission lines from a variety of astronomical sources. 相似文献