Angular acceptance analysis of an infrared focal plane array with a built-in stationary Fourier transform spectrometer

Gillard, Frédéric; Ferrec, Yann; Guérineau, Nicolas; Rommeluère, Sylvain; Taboury, Jean; Chavel, Pierre

doi:10.1364/josaa.29.000936

Cited by 8 publications

(9 citation statements)

References 13 publications

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“…In the presented spectrometer, full spectral resolution is achieved up to a 3.5 mm fibre core seen at lens focal 75mm which corresponds to R=3850Such a size of fibre allows us large collecting power. This collecting power is even larger when the substrate index is higher as it is described in [3].…”

Section: Spectral Bandwidthmentioning

confidence: 79%

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SWIFTS-LA : an unprecedently small static imaging Fourier transform spectrometer

Coarer

Guérineau

Martín

et al. 2017

International Conference on Space Optics — ICSO 2014

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Section: Spectral Bandwidthmentioning

confidence: 79%

“…Gillard [3] has derived the equations that link the maximal angular size of the source and the spectral resolution condition permitting the system to accept a maximum of optical étendue. To simplify we can use the following formula related to the telecentric f/N condition.…”

Section: Spectral Bandwidthmentioning

confidence: 99%

SWIFTS-LA : an unprecedently small static imaging Fourier transform spectrometer

Coarer

Guérineau

Martín

et al. 2017

International Conference on Space Optics — ICSO 2014

View full text Add to dashboard Cite

“…We define the maximum diameter Δθ max of the source as the angular distance between two points producing two opposite interferograms at the maximum path difference δ max . It follows [8] : …”

Section: Microspoc: Fundamental Propertiesmentioning

confidence: 99%

“…Compared to a classic Michelson interferometer, the angular acceptance is multiplied by the factor n 1 . When illuminated by an extended source positioned at a finite distance from the detection, a theoretical and numerical analysis is necessary to describe the fringe formation inside the FTIR-FPA structure [8]. The main result of this analysis is that the FIR-FPA can tolerate extended sources (of typically 1 mm) at a reduced distance (typically 20 mm), allowing a simple front lens design compatible with a handheld package.…”

Section: Microspoc: Fundamental Propertiesmentioning

confidence: 99%

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Dewar cooler integrated MWIR spectrometer for high rates and high dynamic range measurements

Guérineau

Rommeluère

Ferrec

et al. 2015

Next-Generation Spectroscopic Technologies VIII

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There is a need for compact, hand-held, spectrometers for the measurement of spectral signatures of chemicals or objects. To achieve this goal, a new concept of Fourier-transform interferometer (FTIR) directly integrated on the infrared focal plane array (FPA) has been developed at ONERA. The fundamental properties of this key element called MICROSPOC will be recalled and we will see how those properties can be exploited to get a snapshot, compact and cryogenic MWIR spectrometer. These design rules have been applied to develop a very compact device that combines the metrological properties of a FTIR-FPA of quantum HgCdTe technology with the radiometric performances of a last generation Sofradir detection block (Infrared Detector Dewar Cooler Assembly -IDDCA). The experimental performances of the prototype will be presented, in terms of spectral resolution, acquisition rate, dynamic range and noise equivalent spectral radiance. We will discuss at the end the potential of this technology to meet the requirements of different applications.

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AMICal Sat and ATISE: two space missions for auroral monitoring

Barthélemy¹,

Калегаев²,

Vialatte³

et al. 2018

J. Space Weather Space Clim.

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A lack of observable quantities renders it generally difficult to confront models of Space Weather with experimental data and drastically reduces the forecast accuracy. This is especially true for the region of Earth’s atmosphere between altitudes of 90 km and 300 km, which is practically inaccessible, except by means of remote sensing techniques. For this reason auroral emissions are an interesting proxy for the physical processes taking place in this region. This paper describes two future space missions, AMICal Sat and ATISE, that will rely on CubeSats to observe the aurora. These satellites will perform measurements of auroral emissions in order to reconstruct the deposition of particle precipitations in auroral regions. ATISE is a 12U CubeSat with a spectrometer and imager payloads. The spectrometer is built using the micro-Spectrometer-On-a-Chip (μSPOC) technology. It will work in the 370–900 nm wavelength range and allow for short exposure times of around 1 s. The spectrometer will have six lines of sight. The joint imager is a miniaturized wide-field imager based on the Teledyne-E2V ONYX detector in combination with a large aperture objective. Observation will be done at the limb and will enable reconstruction of the vertical profile of the auroral emissions. ATISE is planned to be launched in mid 2021. AMICal Sat is a 2U CubeSat that will embed the imager of ATISE and will observe the aurora both in limb and nadir configurations. This imager will enable measuring vertical profiles of the emission when observing in a limb configuration similar to that of ATISE. It will map a large part of the night side auroral oval with a resolution of the order of a few km. Both the spectrometer and imager will be calibrated with a photometric precision better than 10% using the moon as a wide-field, stable and extended source. Ground-based demonstrators of both instruments have been tested in 2017 in Norway and Svalbard. Even though some issues still need to be solved, the first results are very encouraging for the planned future space missions. Data interpretation will be done using the forward Transsolo code, a 1D kinetic code solving the Boltzmann equation along a local vertical and enabling simulation of the thermospheric and ionospheric emissions using precipitation data as input.

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Angular acceptance analysis of an infrared focal plane array with a built-in stationary Fourier transform spectrometer

Cited by 8 publications

References 13 publications

SWIFTS-LA : an unprecedently small static imaging Fourier transform spectrometer

SWIFTS-LA : an unprecedently small static imaging Fourier transform spectrometer

Dewar cooler integrated MWIR spectrometer for high rates and high dynamic range measurements

AMICal Sat and ATISE: two space missions for auroral monitoring

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