A method for the simultaneous correction of bandpass and stray-light effects in array spectroradiometer data is presented. The method is based on the inversion of the instrument matrix of a device determined with the help of tuneable lasers. By applying the Tikhonov regularization technique, a straightforward correction of the measurement results is possible.
Compact and cost-effective array spectroradiometers are increasingly used in photometric and radiometric measurements. In this report, results of the colorimetric characterisation of LEDs using both low-end and high-end array spectroradiometers are compared to those obtained with the help of a conventional scanning double-monochromator spectroradiometer. Problems related to the utilisation of the array spectroradiometers for such applications are discussed. Effects of the most important instrumental parameters, such as the stray light suppression and the bandpass irregularities, are also assessed. The comparison showed an agreement among the results provided by the different spectroradiometers within the typical uncertainty levels, even for the low-end devices.
An investigation of the short- and long-term stability of various low-end and high-end array spectroradiometers is presented. Potentially weak points of array spectroradiometers with respect to their suitability for absolute calibrations are pointed out. The influence of ambient conditions on relevant instrumental characteristics and their temporal stability is discussed. It is shown that the temporal stability of some instruments can be significantly affected by high ambient humidity. Most important ambient temperature effects on instrument properties are also discussed.
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