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The impact of cooling on CCD-based camera systems in the field of image luminance measuring devices

From general statements made about the cooling of the CCD sensor within image luminance measuring devices (ILMD), one tends to conclude that cooling has an important effect on the luminance measurement results. However, this general statement is not valid. Based on a detailed model for the properties and the operation of ILMDs, we present results of the measurements for parameters of cooled and non-cooled systems. The influence of the two different parameter sets on the results of luminance measurements is illustrated for variations in the signal level and the temperature conditions. In summary, it can be said that only for very special applications does the cooling of the CCD have a significant influence on the measurement uncertainty associated with the luminance measurement results. Normally, one can compensate for the little drawbacks of non-cooled systems by selecting the most appropriate measuring algorithms.