Realization of (400∼950) nm detector-based spectral radiance scale at NIM

Detector-based radiometric measurement is advantageous in terms of measurement uncertainty. National Institute of Metrology China (NIM) has developed a facility for detector-based spectral radiance scale realization in the range of (400∼950) nm. The scale is realized based on a tunable-laser coupled integrating sphere source using galvanometer-driven mirror, and a silicon trap reference standard detector calibrated directly against NIM’s primary standard for spectral power responsivity and NIM’s effective area calibration facility for apertrue area. Sources and transfer standards are characterized, and spectral radiance responsivity can be measured with uncertainties at the (0.2∼0.4) % level.