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Light source for stray light characterisation of EnMAP spectrometers

Pope, Charles Thomas and Baumgartner, Andreas (2019) Light source for stray light characterisation of EnMAP spectrometers. In: Proceedings of SPIE, 11151, 1115123_1-1115123_8. SPIE Remote Sensing 2019, 9.- 12. Sep. 2019, Strasbourg. DOI: 10.1117/12.2531264

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Official URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11151/1115123/Light-source-for-stray-light-characterisation-of-EnMAP-spectrometers/10.1117/12.2531264.full


EnMAP is a German hyperspectral satellite mission. The Remote Sensing Technology Institute of the German Aerospace Center is responsible for the stray light characterisation of the satellite’s spectrometers. This paper describes the light source developed for that purpose and how it will be employed to characterise the in-band, in-field stray light. This type of stray light can be characterised by measuring the point spread function (PSF) at multiple locations on the detector. Because of the cumulative effect of stray light, it is necessary to characterisethe PSF in the near- and far-field. The PSF can span a range of more than 6 orders of magnitude from the peak to the wings at the edges of the detector, exceeding the intrinsic dynamic range of the instrument. Therefore a high dynamic range (HDR) PSF measurement is required: A spectrally and angularly narrow spot of light is guided onto the instrument then measurement frames of multiple signal levels are acquired. The signal level is controlled by changing the instrument’s integration time or changing the neutral density filter of the light source. The overexposed pixels in the higher signal level frames are excluded, then the multiple image frames are combined into one HDR frame which can then be used in the stray light correction algorithm. This HDR ’bracketing’ technique is demonstrated here with DLR’s HySpex VNIR-1600 airborne imaging spectrometer.

Item URL in elib:https://elib.dlr.de/128709/
Document Type:Conference or Workshop Item (Poster)
Title:Light source for stray light characterisation of EnMAP spectrometers
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pope, Charles ThomasCharles.Pope (at) dlr.deUNSPECIFIED
Baumgartner, AndreasAndreas.Baumgartner (at) dlr.dehttps://orcid.org/0000-0002-8495-5407
Date:10 September 2019
Journal or Publication Title:Proceedings of SPIE
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1117/12.2531264
Page Range:1115123_1-1115123_8
Series Name:Sensors, Systems, and Next-Generation Satellites XXIII
Keywords:Stray light, hyperspectral imaging spectrometer, characterisation, light source, HySpex, EnMAP, CHB
Event Title:SPIE Remote Sensing 2019
Event Location:Strasbourg
Event Type:international Conference
Event Dates:9.- 12. Sep. 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):Vorhaben Spectroscopic Methods in Remote Sensing
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Pope, Charles Thomas
Deposited On:06 Aug 2019 13:24
Last Modified:28 Oct 2019 14:39

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