Characterization of the angular response of a multi-directional spectroradiometer for measuring spectral radiance
Abstract Despite its importance, few instruments are able to measure the angular distribution of the solar spectrum with a high spectral and temporal resolution. We present a novel characterization method of the multi-directional entrance optics of the AMUDIS (Advanced MUltiDIrectional Spectroradiom...
Main Authors: | , , , , |
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Format: | Article |
Language: | English |
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SpringerOpen
2021-07-01
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Series: | EPJ Techniques and Instrumentation |
Subjects: | |
Online Access: | https://doi.org/10.1140/epjti/s40485-021-00069-4 |
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author | Mario Tobar Foster Eduardo Luiz Weide Angelika Niedzwiedz Jens Duffert Gunther Seckmeyer |
author_facet | Mario Tobar Foster Eduardo Luiz Weide Angelika Niedzwiedz Jens Duffert Gunther Seckmeyer |
author_sort | Mario Tobar Foster |
collection | DOAJ |
description | Abstract Despite its importance, few instruments are able to measure the angular distribution of the solar spectrum with a high spectral and temporal resolution. We present a novel characterization method of the multi-directional entrance optics of the AMUDIS (Advanced MUltiDIrectional Spectroradiometer) which is a multidirectional spectroradiometer based on three CCD image sensors combined with imaging spectrographs. The new type of entrance optics consists of 435 different optical fibres uniformly distributed along 145 directions covering the upper hemisphere and allowing simultaneous measurements of the radiance in the ultraviolet, visible and near infrared part of the spectrum, ranging from 280 nm to 1700 nm. The experimental setup for characterizing the multidirectional entrance optics is based on a 100 W halogen lamp and a robotic arm, which moves the lamp tangentially over the surface of a virtual sphere of 102.5 cm radius around the entrance optics. The characterization revealed misalignments in the position of the optical fibres of up to 3∘ (which can affect radiance measurements, specially under broken clouds conditions). The novel characterization method improved 3-fold the alignment up to ±0.1∘ |
first_indexed | 2024-12-19T16:05:47Z |
format | Article |
id | doaj.art-606f3182e6a840958c059a2378d3beb1 |
institution | Directory Open Access Journal |
issn | 2195-7045 |
language | English |
last_indexed | 2024-12-19T16:05:47Z |
publishDate | 2021-07-01 |
publisher | SpringerOpen |
record_format | Article |
series | EPJ Techniques and Instrumentation |
spelling | doaj.art-606f3182e6a840958c059a2378d3beb12022-12-21T20:14:50ZengSpringerOpenEPJ Techniques and Instrumentation2195-70452021-07-018111510.1140/epjti/s40485-021-00069-4Characterization of the angular response of a multi-directional spectroradiometer for measuring spectral radianceMario Tobar Foster0Eduardo Luiz Weide1Angelika Niedzwiedz2Jens Duffert3Gunther Seckmeyer4Institute of Meteorology and Climatology, Leibniz University HannoverInstitute of Meteorology and Climatology, Leibniz University HannoverInstitute of Meteorology and Climatology, Leibniz University HannoverInstitute of Meteorology and Climatology, Leibniz University HannoverInstitute of Meteorology and Climatology, Leibniz University HannoverAbstract Despite its importance, few instruments are able to measure the angular distribution of the solar spectrum with a high spectral and temporal resolution. We present a novel characterization method of the multi-directional entrance optics of the AMUDIS (Advanced MUltiDIrectional Spectroradiometer) which is a multidirectional spectroradiometer based on three CCD image sensors combined with imaging spectrographs. The new type of entrance optics consists of 435 different optical fibres uniformly distributed along 145 directions covering the upper hemisphere and allowing simultaneous measurements of the radiance in the ultraviolet, visible and near infrared part of the spectrum, ranging from 280 nm to 1700 nm. The experimental setup for characterizing the multidirectional entrance optics is based on a 100 W halogen lamp and a robotic arm, which moves the lamp tangentially over the surface of a virtual sphere of 102.5 cm radius around the entrance optics. The characterization revealed misalignments in the position of the optical fibres of up to 3∘ (which can affect radiance measurements, specially under broken clouds conditions). The novel characterization method improved 3-fold the alignment up to ±0.1∘https://doi.org/10.1140/epjti/s40485-021-00069-4Solar radiationSpectroradiometrySpectral radiance |
spellingShingle | Mario Tobar Foster Eduardo Luiz Weide Angelika Niedzwiedz Jens Duffert Gunther Seckmeyer Characterization of the angular response of a multi-directional spectroradiometer for measuring spectral radiance EPJ Techniques and Instrumentation Solar radiation Spectroradiometry Spectral radiance |
title | Characterization of the angular response of a multi-directional spectroradiometer for measuring spectral radiance |
title_full | Characterization of the angular response of a multi-directional spectroradiometer for measuring spectral radiance |
title_fullStr | Characterization of the angular response of a multi-directional spectroradiometer for measuring spectral radiance |
title_full_unstemmed | Characterization of the angular response of a multi-directional spectroradiometer for measuring spectral radiance |
title_short | Characterization of the angular response of a multi-directional spectroradiometer for measuring spectral radiance |
title_sort | characterization of the angular response of a multi directional spectroradiometer for measuring spectral radiance |
topic | Solar radiation Spectroradiometry Spectral radiance |
url | https://doi.org/10.1140/epjti/s40485-021-00069-4 |
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