Stray light correction of array spectroradiometer measurement in ultraviolet

Abstract

Abstract. For most of the array spectroradiometer, stray light is significant in UV band. Stray light correction of a UV array spectroradiometer is investigated using optical filters. If a group of filters with continuous bandpass are chosen, stray light contribution due to all the bands can be obtained using a numerical algorithm. The array spectroradiometer with the stray light corrected is used to measure the spectral irradiance of several UV lamps. The measurement results are compared to a double monochromator spectroradiometer. When xenon lamp is the array spectroradiometer calibration lamp, after stray light correction, the difference can be improved from nearly 10% to 2.0% in UVC band. When tungsten lamp is the calibration lamp, the difference can be improved from around 90% to less than 20%.

Characterisation and Field Test of a Simple AvaSpec Array Spectroradiometer for Solar Irradiance Measurements at an Alpine Site

“…The customary traceability chain of a spectroradiometer usually involves calibration through lamps (e.g., in the laboratory), followed by independent comparison with a reference instrument (in the field). However, as shown by previous studies [67][68][69], incandescence lamps, such as those used in our current setup, are not the best way to calibrate the AvaSpec. Indeed, their emittance in the UV region is very low, and the sensitivity of the array spectroradiometer in the same range is also very weak; therefore, only low and noisy signals are expected.…”

“…Indeed, as discussed in Section 3.1.5, the use of incandescence lamps to calibrate array spectroradiometers in regions of weak sensitivity, such as UV and IR [68,69], is problematic with our current system. The latter can certainly be improved in the future, e.g., by employing optical cut-off filters [16,48,67], and thus reducing the infrared component of the irradiance, or even by using completely different light sources, such as LEDs [79] (stability requirements in absolute calibrations would exclude deuterium lamps from the choice [22]). However, we also demonstrated that the response can be determined by transfer once for all (or with a rather low frequency), and then tracked this through the use of 200 W lamps in a relative way.…”

“…The following supporting information can be downloaded at: https: //www.mdpi.com/article/10.3390/en16072998/s1, Table S1: Non-exhaustive list of previous studies involving array spectroradiometers; Figure S1 [3,7,11,16,23,28,29,48,[66][67][68][69]73,[81][82][83][84][85][86][87][88][89][90][91][92][93][94].…”