Several kinds of optical problems involved in calibration of an array spectroradiometer were investigated
such as ultroviolet radiation
stray light
and bandwidth. The difference of ultraviolet radiation measurement of the array spectroradiometer under a xenon lamp and a tungsten halogen lamp was compared and the stray light from the measurement was evaluated. The spectra of the tungsten halogen lamp without and with optical filters were measured by using the array spectroradiometer and the deviation caused by the stray light in the ultraviolet radiation measurement was estimated. Furthermore
the narrow spectral widths captured by different spectroradiometers were measured and the effects of the bandwidths of the spectroradiometers on irradiation calculation were discussed. The experimental results for some array spectroradiometers show that the contribution of the stray light from the tungsten halogen lamp at 300 nm can be as high as 30%
and that from the xenon lamp can be around 5%. Moreover
the bandwidth of the spectroradiometers limits its ability to measure the narrow spectral width for lamps
and the measuring deviation with different bandwidths can be as high as 4% at 365 nm. These results demonstrate that the stray light and the bandwidth of array spectroradiometers are vital to its measurement accuracy.
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