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NIST traceable measurements of radiance and luminance levels of night-vision-goggle test-instruments

机译:NIST夜视镜测试仪器的辐射度和亮度水平的可追溯测量

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In order to perform radiance and luminance level measurements of night-vision-goggle (NVG) test instruments, NIST developed new-generation transfer-standard radiometers (TR). The new TRs can perform low-level radiance and luminance measurements with SI traceability and low uncertainty. The TRs were calibrated against NIST detector/radiometer standards holding the NIST photometric and radiometric scales. An 815 nm diode laser was used at NIST for the radiance responsivity calibrations. A spectrally flat (constant) filter correction was made for the TRs to correct the spectral responsivity change of the built-in Si photodiode for LEDs peaking at different wavelengths in the different test sets. The radiance responsivity transfer to the test instruments (test-sets) is discussed. The radiance values of the test instruments were measured with the TRs. The TRs propagate the traceability to the NIST detector-based reference scales. The radiance uncertainty obtained from three TR measurements was 4.6 % (k=2) at a luminance of 3.43 × 10~(-4) cd/m~2. The output radiance of the previously used IR sphere source and the radiance responsivity of a previously used secondary standard detector unit, which was originally calibrated against an IR sphere source, were also measured with the TRs. The performances of the NVG test instruments were evaluated and the manufacturer produced radiance and luminance levels were calibrated with SI/NIST traceability.
机译:为了执行夜视镜(NVG)测试仪器的辐射度和亮度水平测量,NIST开发了新一代的传输标准辐射计(TR)。新的TR可以执行具有SI可追溯性和低不确定性的低水平辐射和亮度测量。 TR相对于NIST探测器/辐射计标准(使用NIST光度和辐射度标尺)进行校准。 NIST使用815 nm二极管激光器进行辐射响应度校准。针对TR进行了光谱平坦(恒定)的滤光片校正,以校正内置式Si光电二极管对于在不同测试集中以不同波长达到峰值的LED的光谱响应度变化。讨论了辐射响应度到测试仪器(测试装置)的转移。用TR测量测试仪器的辐射值。 TR将可追溯性传播到基于NIST检测器的参考标尺。在3.43×10〜(-4)cd / m〜2的亮度下,通过三个TR测量获得的辐射不确定度为4.6%(k = 2)。还使用TR来测量先前使用的IR球体光源的输出辐射度和最初使用IR球体源进行校准的先前使用的次级标准检测器单元的辐射响应度。评估了NVG测试仪器的性能,并使用SI / NIST可追溯性对制造商生产的辐射度和亮度水平进行了校准。

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