First aircraft test results of a compact, low cost hyperspectral imager for earth observation from space

Goeij, B.T.G. de; Otter, Gerard; Wakeren, J.M.O. van; Veefkind, J. P.; Vlemmix, Tim; Ge, Xinrui; Levelt, P. F.; Dirks, Bob P.F.; Toet, P.M.; Wal, L.F. van der; Jansen, R.

doi:10.1117/12.2296068

Cited by 8 publications

(5 citation statements)

References 4 publications

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“…As a case validation the calibration of a spectroradiometer in the visible range will be performed, comparing the FEL lamp method and the tunable laser method. The spectroradiometer under test will be the TROPOLITE breadboard model [3]. The TROPOLITE is an instrument, designed to fly on a cube-sat, focusing on NO2 detection and has a spectral range of 300 to 500nm with a resolution of about 0.5 nm.…”

Section: Discussionmentioning

confidence: 99%

Traceable radiance source for spectroradiometer calibration

Berg¹,

Dekker²,

Laan³

et al. 2019

International Conference on Space Optics — ICSO 2018

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SI traceable calibration of satellite instruments like spectroradiometers get increasingly important in space-based observation for various reasons. First, requirements on measurements in terms of accuracy, dynamic range and wavelength range get increasingly demanding. Second, long term observations require SI traceability for comparability of data records that have been acquired over a long time interval (decades) and with different instruments. In this contribution we outline an approach for radiance calibration of spectroradiometers with a wavelength-tunable radiance source. The radiance source is based on an integrating sphere and a widely tunable laser (UVN-SWIR) and will be calibrated against a set of reference detector standards. By offering the radiance source as a stimulus to the spectroradiometer under test, the instrument can be calibrated for spectral radiance response. Potentially this traceability route could lead to a reduced measurement uncertainty compared to the traditional FEL-lamp based method. Furthermore, other instrument characteristics can also be derived from the same set of measurements, like stray-light effects and the instrument response function.

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Section: Discussionmentioning

confidence: 99%

Traceable radiance source for spectroradiometer calibration

Berg¹,

Dekker²,

Laan³

et al. 2019

International Conference on Space Optics — ICSO 2018

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“…The TANGO Carbon and Nitro instruments are members of the TNO Spectrolite family of imaging spectrometers. [2][3][4] These instruments are all-aluminium push broom spectrometers that provide high performance in a modest volume due to the use of freeform optics. The motivation to use the Spectrolite instrument as the baseline for TANGO is summarized below:…”

Section: Instrument Conceptmentioning

confidence: 99%

Development of the TANGO carbon instrument for greenhouse gas detection

Day,

Brenny,

Palombo

et al. 2023

Remote Sensing Technologies and Applications in Urban Environments VIII

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The Twin ANthropogenic Greenhouse Gas Observers (TANGO) mission will monitor and quantify greenhouse gas emissions at the level of individual facilities. A consortium consisting of ISISpace, TNO, SRON and KNMI are developing the TANGO mission for the ESA Scout program. ISISpace is the prime contractor and responsible for the spacecraft, SRON and KNMI are responsible for the atmospheric science, while TNO is developing the instruments. The TANGO space segment consists of two agile 16U CubeSat satellites flying closely in tandem, each equipped with an imaging spectrometer. TANGO Carbon measures the emission of CH₄ and CO₂ in the SWIR1 spectral band (1590-1675 nm at 0.45-nm spectral resolution), while TANGO Nitro measures the emission of NO₂ in the visible spectral range (405- 490 nm at 0.6-nm spectral resolution). Both instruments are reflective pushbroom spectrometers, made almost entirely from aluminum, and will cover a 30-km swath from a 500-km altitude with a spatial resolution of 300 m. The instruments share a similar architecture, using freeform mirrors to achieve high optical performance in a compact 8U envelope. In this paper, we will present the design and performance of the Carbon instrument, where a key engineering challenge is to achieve the desired spatial resolution and SNR from the limited instrument volume (8U). A tight integration of optical and mechanical design, coupled to detailed tolerance, alignment, straylight and STOP (structural thermal optical performance) analyses, allow us to reach that goal.

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“…The imaging spectrometers used in TANGO-Carbon and TANGO-Nitro are of the TNO Spectrolite family of instruments [5][6][7] . These are all-aluminium push broom spectrometers that provide a high performance in a modest volume due to the use of free-form optics.…”

Section: Instrument Conceptmentioning

confidence: 99%

Development of spectrometers for the TANGO greenhouse gas monitoring missions

Brenny,

Day,

de Goeij

et al. 2023

International Conference on Space Optics — ICSO 2022

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The current paper introduces the Twin ANthropogenic Greenhouse Gas Observers (TANGO) instruments and mission. The purpose of TANGO is monitoring and quantifying greenhouse gas emissions, with a focus on characterizing emission sources down to the level of individual facilities. The TANGO mission was developed for the ESA-Scout program by a consortium consisting of ISISpace, TNO, SRON and KNMI. It consists of two agile CubeSat satellites that fly in tandem, with less than 1 minute between observations of the same target, each satellite equipped with a spectrometer of the TNO Spectrolite family of instruments that observes a different part of the spectrum. TANGO-Carbon measures emission of CH₄ and CO₂ in the SWIR1 spectral band. TANGO-Nitro measures emission of NO₂ in the visible spectral range. The Nitro instrument has a multifunctional role, using the NO₂ measurements to improve the detection of (anthropogenic) CO₂ plumes, deriving historic CO₂ emission trends based on available global NO₂ observations, and quantifying the possible CO₂ contribution in mixed CH₄-CO₂ sources. Each TANGO instrument fits in an 8U volume (on a 16U platform) and are all-aluminium, reflective pushbroom spectrometers covering a 30-km swath from a 500-km altitude, with a ground sampling distance of 300 m × 300 m. In this paper we will present the mission, the shared instrument concept, as well as the design and performance of both Carbon and Nitro instruments.

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First aircraft test results of a compact, low cost hyperspectral imager for earth observation from space

Cited by 8 publications

References 4 publications

Traceable radiance source for spectroradiometer calibration

Traceable radiance source for spectroradiometer calibration

Development of the TANGO carbon instrument for greenhouse gas detection

Development of spectrometers for the TANGO greenhouse gas monitoring missions

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