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Andoni Moral

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Proceedings Article | 11 June 2021 Open Access

Flight laser module characterization for the ExoMars Raman Laser Spectrometer under a potential depressurization

Marina Benito, Pablo Rodriguez, José Rodriguez, Andoni Moral

Proceedings Volume 11852, 118526U (2021) https://doi.org/10.1117/12.2600323

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The Raman Laser Spectrometer (RLS) is one of the Pasteur Payload instruments within ESA’s ExoMars mission to Mars. The RLS instrument scientific goal consists of performing Raman spectroscopy over different mineral powder samples of the Mars subsoil, been able to detect organic samples if they exist. The laser unit contained in RLS is one of the most critical parts of the instrument and must meet a series of requirements and functionalities that guarantee compliance with the scientific requirements. The flight unit was thoroughly characterized, obtaining a 2D mapping of its optical properties. Since the laser modules are hermetically sealed, this characterization was performed in ambient conditions. But what if the internal pressure conditions changed? How would performances be affected? Leak rate requirement was calculated in order to guarantee high internal pressure levels up to end-of-life but a sealing failure leading to a slow degradation or a depressurization event may still be feasible. Two batch of tests were carried out in order to know how the laser unit behaves if a depressurization occurs by chance. The first test phase consisted of characterizing unsealed laser units both in ambient pressure and in vacuum, so that we could see the contrast between both cases. In the second phase of tests, the pressure profile was varied while monitoring both the power and the spectral behavior, in order to study the evolution of performances of these units. This work summarizes the outcome of these test sessions.

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Proceedings Article | 11 June 2021 Open Access

Flight laser module monitoring during ExoMars Raman laser spectrometer environmental testing

Pablo Rodriguez, Marina Benito, César Quintana, Carlos Pérez, Andoni Moral

Proceedings Volume 11852, 118522R (2021) https://doi.org/10.1117/12.2599446

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The flight units of the laser module for the Raman Laser Spectrometer (RLS) instrument of the ExoMars mission were manufactured, tested and finally delivered in March 2018. Based on the data collected during flight batch acceptance testing, FM and FS lasers were picked from that batch, and the former was subsequently tested at the next integration levels, i.e. RLS instrument, Analytical Laboratory Drawer (ALD) and ExoMars rover itself. As the system complexity increased, the data available for laser performance assessment became sparse due to shorter testing slots and to the basic information available through instrument telemetries and products. In order to assess the status of the laser module during these years of on-ground testing we have developed tools to extract as much information as possible from test sessions. Our starting inputs were some relevant house-keepings, such as laser optical power and temperature, and Raman spectra, from where laser spectral signature was obtained. Our analysis of the available on-ground test sessions at ALD and rover level show that the laser unit is working properly, but a fine tune of the working temperature setpoint may be required to provide optimal scientific return. The procedures developed will be also highly valuable for the definition of the laser performance assessment engineering tools during standard scientific operation in Mars.

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