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To measure the quantum efficiencies of lamp phosphors, a JCSS (Japan Calibration Service System) traceable measurement method that uses a polychromator, with improved optical design to reduce stray light, and an integrating sphere has been developed. To verify the measurement accuracy of this method, a monochromator, which has a 0 : 45 x incident optical system, was used. The BRDF (Bidirectional reflectance Distribution Function) of the phosphor was measured by a goniophotometer. A comparison was made between these JCSS traceable measuring devices on the 260 nm to 400 nm wavelength characteristics of the internal quantum efficiency of the blue phosphor BAM (BaMgAl 10 O 17 : Eu 2 ), which has excitation characteristics up to 400 nm. The results agreed within 4% of the difference of the measured values. This is a good agreement considering that it was a composite measure and that the uncertainty of the spectral irradiance standard in the spectral region is lower than 3%. It has also been established that the proposed method using a polychromator and an integrating sphere shows sufficient measurement accuracy.

Array spectroradiometers are used pervasively in light measurement. However, their properties are not widely understood by users. This report seeks to educate users in the characteristics of array spectroradiometers that are important to obtaining accurate measurement results. Moreover, performance indices are proposed that will enable users to rank instruments according to the properties that affect their applications. In many cases, if the array spectroradiometer is properly characterized, correction can be made to measurements that will improve the accuracy. Details of the nature and use of these corrections are given. Calibration procedures and uncertainties are discussed for various common quantities, giving a sound foundation to measurements. Background information, underlying the discussions, is found in the annexes and references.

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