Compact acousto-optic imaging spectro-polarimeter for mineralogical investigations in the near infrared

Belyaev, Denis; Yushkov, Konstantin B.; Anikin, Sergey P.; Dobrolenskiy, Yu. S.; Laskin, Aleksander; Манцевич, С. Н.; Molchanov, V. N.; Potanin, S.; Korablev, Oleg

doi:10.1364/oe.25.025980

Cited by 24 publications

(10 citation statements)

References 23 publications

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“…3(a). This difference between the two beams is a consequence of the difference in the geometry of the acousto-optical interaction for these two beams 30 …”

Section: Calibration Resultsmentioning

confidence: 99%

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AOTF-based spectro-polarimeter for observing Earth as an exoplanet

Jaiswal

Singh

Jain

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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Earth is the only known habitable planet and it serves as a testbed to benchmark the observations of temperate and more Earth-like exoplanets. It is required to observe the diskintegrated signatures of Earth for a large range of phase angles, resembling the observations of an exoplanet. In this work, an acousto-optic tunable filter (AOTF)-based experiment is designed to observe the spectro-polarimetric signatures of Earth. The results of spectroscopic and polarimetric laboratory calibration are presented here along with a brief overview of a possible instrument configuration. Based on the results of the spectro-polarimetric calibration, simulations are carried out to optimize the instrument design for the expected signal levels for various observing conditions. The usefulness of an AOTF-based spectro-polarimeter is established from this study, and it is found that, in the present configuration, the instrument can achieve a polarimetric accuracy of <0.3% for linear polarization for an integration time of 100 ms or larger. The design configuration of the instrument and the planning of conducting such observations from Lunar orbit are discussed.

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“…3(a). This difference between the two beams is a consequence of the difference in the geometry of the acousto-optical interaction for these two beams 30 …”

Section: Calibration Resultsmentioning

confidence: 99%

“…Although AOTFs are known to be good polarizers, 25 , 30 , 36 to characterize the AOTF it is assumed to be represented by a partial polarizer. A partial polarizer produces a partially polarized beam when an unpolarized light is incident on it.…”

Section: Characterizing the Aotfmentioning

confidence: 99%

AOTF-based spectro-polarimeter for observing Earth as an exoplanet

Jaiswal

Singh

Jain

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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“…Dispersed by AOTFs (Korablev et al 2018), the LMS detects the reflection and thermal radiation spectra of the lunar surface. For a given acoustic-signal radio frequency (RF), the quasi-monochromatic wavelength is diffracted by the AOTF (Strojnik Scholl et al 2015;Bibring et al 2017a;Belyaev et al 2017). For the visible-to-near-infrared (V-NIR) channel (0.48-0.95 µm), diffracted light is converged onto an area array detector to form a spectral image cube of the lunar surface.…”

Section: Instrument Overviewmentioning

confidence: 99%

Lunar Mineralogical Spectrometer on Chang’E-5 Mission

Yuan

et al. 2022

Space Sci Rev

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The Lunar Mineralogical Spectrometer (LMS) is one of the main payloads on the Chang’E-5 (CE-5) lunar probe, belonging to the China Lunar Exploration Program. The scientific objective of the LMS is to explore the mineralogical composition and search for evidence of -OH/H2O in the sampling area. The LMS consists of an optomechanism unit, a dustproof calibration unit (DPCU) and an electronic unit. The LMS is installed on the lander about 1.4-m above the lunar surface, the field of view (FOV) is $4.17\times 4.17^{\circ }$ 4.17 × 4.17 ∘ , the instant FOV of the visible imaging channel is 0.28 mrad, and the typical spatial resolution is 0.56 mm/pixel @ 2 m distance. The rotation range of the 2D scanner is $\pm 22.5^{\circ}$ ± 22.5 ∘ along the azimuth axis and $0\sim 30^{\circ }$ 0 ∼ 30 ∘ along the elevation axis, making it possible to observe the sampling area or to select important observing targets. The dispersing beam uses acousto-optic tunable filters, and target detection is performed with a 2D scanner. The LMS acquires spectral imaging information covering 480–950 nm, and reflectance spectra of 900–3,200-nm, both at a 5-nm/band sampling interval. The spectral resolution is $2.4\sim 9.4\text{ nm}$ 2.4 ∼ 9.4 nm in the visible and near-infrared channels and $7.6\sim 24.9\text{ nm}$ 7.6 ∼ 24.9 nm in the short–medium-wave infrared channel. The LMS has a 588-band detection capability designed for fine spectral observation of sampling points and wields a 20-band full-view multi-spectral mode to observe candidate areas prior to sampling. The DPCU of the LMS is integrated with a calibration diffuser that is used for in-flight calibration on the lunar surface using solar irradiation, thus improving the quantitative level of scientific data.

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“…4,5 They are especially suitable for deep space exploration studies, which have strict requirements on weight and volume and must function in the relatively harsh space environment. 6–13 In some of wide variations temperature environment, such as the surfaces of the Moon and Mars, causing the spectral characteristics of the output and response curves to differ when provided with the same input spectral information. This directly affects the inversion accuracy of spectral data and the quantization level of the spectral information.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Correction Model for Temperature Dependence of an Acousto-Optic Tunable Filter (AOTF) Infrared Spectrometer for Lunar Surface Detection

et al. 2019

Appl Spectrosc

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The photoelectric response characteristics of an infrared spectrometer based on an acousto-optic tunable filter (AOTF) are greatly affected by the temperature change of the radio frequency power amplifier and shortwave infrared detector. If calibration is not conducted, that will affect the quantitative level of the data. This paper puts forward a measurement and correction method for the temperature characteristics of an AOTF infrared spectrometer which is used in lunar surface detection and sets up a temperature characteristics correction model. This model was applied to an AOTF infrared spectrometer mounted on China’s unmanned lunar rover. Laboratory tests show that the temperature causes an instrument variation of ∼20% when the temperature is between −20 ℃ and + 55 ℃, but this model reduces this variation to < 6%. Evaluating data from the lunar surface also verifies the effectiveness of this method.

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Compact acousto-optic imaging spectro-polarimeter for mineralogical investigations in the near infrared

Cited by 24 publications

References 23 publications

AOTF-based spectro-polarimeter for observing Earth as an exoplanet

AOTF-based spectro-polarimeter for observing Earth as an exoplanet

Lunar Mineralogical Spectrometer on Chang’E-5 Mission

Measurement and Correction Model for Temperature Dependence of an Acousto-Optic Tunable Filter (AOTF) Infrared Spectrometer for Lunar Surface Detection

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