Remote optical interferometric displacement technology development for planetology
Rattachement africain : fr. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
The Apollo seismic experiment yielded unique seismology data from the Moon. Howeverunderstanding of the Moon’s interior structure remains constrained by the limitations of theApollo’s sensors. Fifty years later, the Mars seismometer Insight/SEIS demonstrated reducedself-noise and enhanced resolution. A spare model will be deployed to the Moon in 2026 as partof the FSS (CLPS 12) mission. Nevertheless, it is still far from meeting the International LunarNetwork (ILN) requirements. This is the reason why a technological breakthrough is needed.By switching from electrostatic displacement sensors to optical interferometric ones, animprovement of several orders of magnitude is made in mitigating parasitic forces (electrostaticnoise to pressure radiation). Additionally, this approach allows us to minimize the electroniccomponents within the deployed sensor. This reduction is made possible by employing remoteoptical readout of the displacement via an optical link connecting the deployed sensor to thelander. Since the objective is to operate without force feedback, the primary challenge lies inmeeting two simultaneous requirements: accommodating proofmass rebalancing up to a fewmillimeters across a 100°C thermal variation and achieving an exceptionally fine resolution todetect proofmass displacements as small as 10-12 m @ 1 Hz induced by seismic activities.This challenge led to the use of a laser source within a phase-modulated Michelsoninterferometer. The critical objective is to isolate the interference between the two movingmirrors while minimizing the impact of all parasitic back reflections. Whereas, it is well-knownthat a -60dB parasitic reflection results in a -30dB variation of the interference pattern.Consequently, both experimental and theoretical work are conducted to characterize, model andquantify the effect of each parasitic reflection, depending of its position within the optical design.In this frame, the use of Rayleigh Optical Frequency Domain Reflectometry (OFDR) tocharacterize the interferometer will be described, in addition to the use of collected informationin the model to explain the observed fringe patterns.In conclusion, a comparative analysis of the performance of this optical readout technique inrelation to other published methods is performed, taking into account benefits and drawbacks ofeach of them. Notably, the capability of achieving remote readout of the signal is emphasized.Indeed, as the ability to minimize electronic components within the sensor is crucial for low-noise applications, we will explore the synergy with remote optical readout technology, such asthe one developed at ESEO (Engineering School in Angers, France). This opens the path tobroader applications across various type of geoscience sensors.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Remote optical interferometric displacement technology development for planetology
- Date Crossref
- 06/05/2024
- Éditeur
- Copernicus GmbH
- Type
- posted-content
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Centre National de la Recherche Scientifique pays non établi dans la noticeOrganisme public
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Institut de physique du globe de Paris pays non établi dans la noticeStructure de recherche
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Université Paris Cité pays non établi dans la noticeUniversité ou école supérieure
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Laboratoire Hubert Curien pays non établi dans la noticeStructure de recherche
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Institut d’Optique Graduate School pays non établi dans la noticeUniversité ou école supérieure
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Université Jean Monnet pays non établi dans la noticeUniversité ou école supérieure
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Centre National d'Études Spatiales pays non établi dans la noticeOrganisme public
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MAAGM pays non établi dans la noticeInstitution
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Université de Paris pays non établi dans la noticeUniversité ou école supérieure
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exail pays non établi dans la noticeInstitution
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CNES pays non établi dans la noticeInstitution
Centre National de la Recherche Scientifique, Institut de physique du globe de Paris et Université Paris Cité, avec 8 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.