Shaw P S, Larason T C, Gupta R, Brown S W, Lykke K R
National Institute of Standards and Technology, Gaithersburg, MD 20899-0001.
J Res Natl Inst Stand Technol. 2000 Oct 1;105(5):689-700. doi: 10.6028/jres.105.055. Print 2000 Sep-Oct.
A cryogenic radiometer-based system was constructed at the National Institute of Standards and Technology for absolute radiometric measurements to improve detector spectral power responsivity scales in the wavelength range from 900 nm to 1800 nm. In addition to the liquid-helium-cooled cryogenic radiometer, the system consists of a 100 W quartz-tungsten-halogen lamp light source and a 1 m single-grating monochromator for wavelength selection. The system was characterized and the uncertainty in spectral power responsivity measurements evaluated. A variety of photodetectors, including indium gallium arsenide photodiodes (InGaAs), germanium (Ge) photodiodes, and pyroelectric detectors, were subsequently calibrated. Over most of the spectral range, the spectral power responsivity of the photodetectors can be measured with a combined relative standard uncertainty of 0.4 % or less. This is more than a factor of two smaller than our previous capabilities, and represents a significant improvement in the near infrared (NIR) spectral power responsivity scale maintained at NIST. We discuss the characterization of the monochromator-based system and present results of photodetector spectral power responsivity calibrations.
美国国家标准与技术研究院构建了一个基于低温辐射计的系统,用于绝对辐射测量,以改进900纳米至1800纳米波长范围内探测器的光谱功率响应度标度。除液氦冷却的低温辐射计外,该系统还包括一个100瓦的石英钨卤灯光源和一个用于波长选择的1米单光栅单色仪。对该系统进行了特性表征,并评估了光谱功率响应度测量的不确定度。随后对包括铟镓砷光电二极管(InGaAs)、锗(Ge)光电二极管和热释电探测器在内的多种光电探测器进行了校准。在大部分光谱范围内,光电探测器的光谱功率响应度测量的合成相对标准不确定度可控制在0.4%或更低。这比我们之前的能力提高了两倍多,代表了美国国家标准与技术研究院维持的近红外(NIR)光谱功率响应度标度的显著改进。我们讨论了基于单色仪的系统的特性,并给出了光电探测器光谱功率响应度校准的结果。