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Compact high-resolution echelle-AOTF NIR spectrometer for atmospheric measurements

dc.contributor.authorKorablev, O.I.
dc.contributor.authorBertaux, J.-L.
dc.contributor.authorVinogradov, I.I.
dc.contributor.authorKalinnikov, Y.K.
dc.contributor.authorNevejans, D.
dc.contributor.authorNeefs, E.
dc.contributor.authorLe Barbu, T.
dc.contributor.authorDurry, G.
dc.date2004
dc.date.accessioned2017-04-20T13:08:02Z
dc.date.available2017-04-20T13:08:02Z
dc.identifier.isbn92-9092-865-4
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/5095
dc.descriptionA new concept of a high-resolution near-IR spectrometer consisting of an echelle grating combined with an acousto-optic tunable filter (AOTF) for separation of diffraction orders, is developed for space-borne studies of planetary atmospheres. A compact design with no moving parts within the mass budget of 3-5 kg allows to reach the resolving power λ/Δλ of 20000-30000. Only a small piece of spectrum in high diffraction orders can be measured at a time, but thanks to flexibility of the AOTF electrical tuning, such pieces of spectrum can be measured randomly and rapidly within the spectral range. This development can be used for accurate measurements of important atmospheric gases, such as CO2 in terrestrial atmosphere, isotopic ratios and minor gases. A spectrometer, based on this principle, SOIR (Solar Occultation InfraRed) is being built for Venus Express (2005) ESA mission. Instruments based on this principle have high potential for the studies of the Earth, in particular for measurements of isotopes of water in the lower atmosphere, either in solar occultation profiling (tangent altitude <10 km), or observing solar glint for integral quantities of the components. Small size of hardware makes them ideal for micro-satellites, which are now agile enough to provide necessary pointing for solar occultation or glint observations. Also, the atmosphere of Mars has never been observed at local scales with such a high spectral resolution. A laboratory prototype consisting of 275-mm echelle spectrometer with Hamamatsu InGaAs 512-pixel linear array and the AOTF has demonstrated λ/Δλ=30000 in the spectral range of 1-1.7 μm. The next set up, covering the spectral ranges of 1-1.7 μm and 2.3-4.3 μm, and the Venus Express SOIR are briefly discussed.
dc.languageeng
dc.relation.ispartofseriesESA SP
dc.titleCompact high-resolution echelle-AOTF NIR spectrometer for atmospheric measurements
dc.typeConference
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeAcoustooptical devices
dc.subject.freeDiffraction gratings
dc.subject.freeDoppler effect
dc.subject.freeInfrared devices
dc.subject.freeOptical filters
dc.subject.freeOptical resolving power
dc.subject.freeSatellites
dc.subject.freeTuning
dc.subject.freeAtmospheric measurements
dc.subject.freeEchelle spectrometers
dc.subject.freeMicro-satellites
dc.subject.freeSpectrometers
dc.source.titleESA-SP 554, Proceedings of the 5th International Conference on Space Optics (ICSO 2004)
dc.source.issue554
dc.source.page73-80
Orfeo.peerreviewedNo
dc.identifier.scopus2-s2.0-8744316006


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