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Measuring absolute infrared spectral radiance with correlated visible photons: technique verification and measurement uncertainty

机译：用相关可见光子测量绝对红外光谱辐射度：技术验证和测量不确定度

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摘要

An experimental system in which correlated photons for radiometric measurements were used has been set up at the National Institute of Standards and Technology. We use visible-IR pairs of correlated photons produced by means of optical parametric downconversion to measure the radiance of a high-temperature IR source at 3.415 and 4.772 μm in an intrinsically absolute manner (i.e., without requiring any externally calibrated radiometric standard). To our knowledge, this is the only radiometric method with which one measures radiance directly, instead of using radiant power and aperture geometry measurements to deduce radiance indirectly. This technique has an additional unusual characteristic: It allows absolute radiometric measurements of IR radiation to be made with high-quality visible detectors. We compare measurements made with this technique with radiance measurements made with conventional means tied to existing radiometric standards. These comparisons show an average agreement to within -3% between the two methods. The results demonstrate an accuracy consistent with the estimated uncertainty of the current measurements. This is the first time to our knowledge that this method has been used to provide absolute radiance measurements of a source that has been calibrated conventionally, revealing unexpected systematic effects and allowing estimates of the ultimate accuracy of this method. In addition, these measurements are further into the IR than any previous measurements of this process and have produced the highest thermally stimulated downconversion signal yet seen. OCIS codes: 030.5630, 130.3060, 350.5610.
机译：美国国家标准技术研究所已经建立了一个使用相关光子进行辐射测量的实验系统。我们使用通过光学参数下转换产生的相关红外光子的可见红外对，以本质上绝对的方式（即不需要任何外部校准的辐射标准）测量3.415和4.772μm的高温红外源的辐射。就我们所知，这是唯一一种可以直接测量辐射度的辐射测量方法，而不是使用辐射功率和孔径几何测量间接推断出辐射度。该技术还有一个额外的异常特性：它允许使用高质量的可见光探测器对IR辐射进行绝对辐射度测量。我们将使用该技术进行的测量与通过与现有辐射标准相关的常规方法进行的辐射测量进行比较。这些比较表明两种方法之间的平均一致性在-3％之内。结果表明准确性与当前测量的估计不确定性一致。据我们所知，这是首次使用该方法对经过常规校准的光源进行绝对辐射度测量，从而揭示出意料之外的系统效应，并可以估算该方法的最终精度。此外，这些测量比该过程的任何先前测量更进一步进入IR并产生了迄今为止所见的最高的热激励下变频信号。 OCIS代码：030.5630、130.3060、350.5610。

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