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Terrestrial solar spectral ultraviolet measurements at the National Renewable Energy Laboratory

机译:国家可再生能源实验室的地面太阳光谱紫外线测量

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Abstract: At the National Renewable Energy Laboratory (NREL), ongoing projects investigate the use of ultraviolet (UV) energy as it applies to aqueous toxic waste purification, material degradation, and terrestrial spectral solar irradiance model development. These projects require knowledge of the UV spectral distribution of natural terrestrial sunlight and artificial sources rich in UV radiation. NREL has modified instrumentation to measure terrestrial solar spectral distributions from 250 to 400 nanometers (nm) at 1 nm intervals. It uses a band width of 2 nm, and a small double monochromator and photomultiplier (1P28) detector. The modified instrument measures artificial sources in the laboratory with up to 1000 times the intensity of natural solar UV radiation. This is done using coupled multiple integrating spheres and by limiting apertures to provide appropriate signal levels. A newly acquired UV spectroradiometer with good wavelength accuracy (0.3 nm) is used to calibrate broad-band solar UV monitoring detectors outdoors and against laboratory standards. Both the metrology and research applications of these UV spectral measurements require detailed uncertainty analyses, which show that uncertainty in the measurements is a strong function of wavelength below 350 nm. The major contributors to the uncertainty are wavelength drive accuracy, passband, detector noise, and calibration source uncertainty. !15
机译:摘要:在国家可再生能源实验室(NREL),正在进行的项目研究了紫外线(UV)能源的使用,因为该技术适用于水性有毒废物的净化,材料降解以及地面光谱太阳辐照度模型的开发。这些项目需要了解自然陆地阳光和富含紫外线辐射的人工光源的紫外线光谱分布。 NREL改进了仪器,以1纳米的间隔测量250到400纳米(nm)的地面太阳光谱分布。它使用2 nm的带宽,以及一个小的双单色仪和光电倍增管(1P28)检测器。改进后的仪器可在实验室中以高达自然太阳紫外线辐射强度1000倍的强度来测量人工源。使用耦合的多个积分球并通过限制孔径以提供适当的信号电平来完成此操作。新获得的具有良好波长准确度(0.3 nm)的紫外线光谱仪用于校准室外的宽带太阳能紫外线监测探测器,并符合实验室标准。这些紫外线光谱测量的计量学和研究应用都需要详细的不确定性分析,这表明测量中的不确定性是350 nm以下波长的强函数。造成不确定性的主要因素是波长驱动精度,通带,检测器噪声和校准源不确定性。 !15

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