RESULTS OF A NIST VNIIOFI COMPARISON OF SPECTRAL-RADIANCE MEASUREMENTS/

A comparison of the spectral-radiance scales of the National Institute of Standards and Technology (NIST) and the All-Russian Research Insti tute for Optophysical Measurements (VNIIOFI) was carried out in 1989 a nd 1990. The spectral range of the comparison was between 240 nm and 2 400 nm. The transfer standards were argon-filled tungsten ribbon filam ent lamps. The NIST/VNIIOFI agreement was 0,5 % to 1 % in the 240 nm t o 800 nm range, and better than 0,5 % between 900 nm and 2400 nm. On a verage, the spectral radiances measured at the VNIIOFI were slightly h igher than the NIST values.