The National Metrology Institute of Japan realized a total spectral radiant flux scale in the visible wavelength range (from 380 nm to 780 nm) for sphere-spectroradiometer calibration in 2π geometry. For a transfer standard in 2π geometry, a standard source based on a specially-designed broadband light-emitting diode (2π standard LED) was used. For the scale realization, we used the goniophotometer/spectroradiometer system. In the realization, an effect of a bandpass function of the array spectroradiometer was corrected by a matrix inversion approach. The relative expanded uncertainty ( k = 2) for the scale is from 3.3% to 5.7% depending on the wavelength range. We also evaluated the contributions of the wavelength calibration and the bandpass function to the measurement of the total spectral radiant flux of typical white LEDs against the 2π standard LED. Our results demonstrate that the 2π standard LED achieves uncertainties comparable to those of a conventional standard ...

中文翻译：

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使用基于宽带LED的传输标准源建立2π总光谱辐射通量标度

日本国立计量学会实现了在可见光波长范围（380 nm至780 nm）中的总光谱辐射通量标度，用于以2π几何形状校准的球形光谱仪。对于2π几何图形的传输标准，使用了基于特殊设计的宽带发光二极管（2π标准LED）的标准光源。为了实现规模，我们使用了测角光度计/分光辐射计系统。在实现中，通过矩阵求逆法校正了阵列光谱辐射计的带通功能的影响。标尺的相对扩展不确定度（k = 2）在3.3％至5.7％之间，具体取决于波长范围。我们还评估了波长校准和带通功能对典型白色LED相对于2π标准LED的总光谱辐射通量的测量的贡献。我们的结果表明，2π标准LED的不确定性可与传统标准LED相比。