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Comparisons of UV spectral radiance calibrations of SBUV/2 type ozone monitoring instruments and traceability to NIST

Spectral radiance calibrations have been made for several SBUV/2 instruments using techniques based upon an internally illuminated spherical integrator and diffuse reflectance panels with BRDF measurements from NIST. Both techniques are referenced to NIST standards of spectral irradiance which are used to derive the spectral irradiance calibrations of the instruments. The spectral radiance of the aperture of the internally illuminated spherical integrator also has been calibrated by NIST against a high temperature blackbody. The consistency of the spectral radiance calibrations and the problems specific to each of the techniques are described.