By Zhaoren Wang, Shupu Xu

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G. if the contact thermometer is not measuring the emitting surface temperature, or if the emissivity model is not truly representative of the blackbody. But, in principle, a link to ITS-90 can be established through a fairly simple modification of the normal transfer standard. This is not the case for the UV/VIS/NIR region of the spectrum. In this region, an alternative method has been widely adopted. A spectral irradiance standard lamp is obtained (with a traceable calibration) and positioned at a measured distance from a diffusing panel of known angular diffuse reflectance (radiance) factor, or BRDF.

The National Laser Radiometry Facility (NLRF) of NPL (Fox 2001) and Spectral Irradiance and Radiance Responsivity Calibrations with Uniform Sources (SIRCUS) of NIST (Brown et al. 2000). Fortunately, solid-state photodiodes exist with relatively smooth variation in their spectral response, allowing continuous spectral responsivity scales to be established by interpolation with relatively few direct calibrations against the cryogenic radiometer. This process is further simplified through specially packaged photodiodes “trap detectors” as a transfer standard.

In such sources, one filter radiometer can be used as a reference to control the output of the lamp by varying the current supplied to it from the power supply in a feedback control circuit. Other filter radiometers, with peak spectral response spread across the spectrum of interest, can be used to monitor spectral changes. In this way, drifts and changes in the output of the lamp can either be corrected or at least monitored, to allow the user to assess their significance for their application.

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A Guide to Othello by Zhaoren Wang, Shupu Xu

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