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Experimental Wind Characterization with the SuperCam Microphone under a Simulated martian Atmosphere

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  • Baptiste Chide, Ecole Nationale Superieure de l Aeronautique et de l Espace, Universite Toulouse III - Paul Sabatier
  • ,
  • Naomi Murdoch, Ecole Nationale Superieure de l Aeronautique et de l Espace
  • ,
  • Yannick Bury, Ecole Nationale Superieure de l Aeronautique et de l Espace
  • ,
  • Sylvestre Maurice, Universite Toulouse III - Paul Sabatier
  • ,
  • Xavier Jacob, Universite Toulouse III - Paul Sabatier
  • ,
  • Jonathan P. Merrison
  • Jens J. Iversen
  • Pierre Yves Meslin, Universite Toulouse III - Paul Sabatier
  • ,
  • Marti Bassas-Portús, Ecole Nationale Superieure de l Aeronautique et de l Espace
  • ,
  • Alexandre Cadu, Ecole Nationale Superieure de l Aeronautique et de l Espace
  • ,
  • Anthony Sournac, Ecole Nationale Superieure de l Aeronautique et de l Espace
  • ,
  • Bruno Dubois, Universite de Toulouse
  • ,
  • Ralph D. Lorenz, Johns Hopkins Applied Physics Laboratory
  • ,
  • David Mimoun, Ecole Nationale Superieure de l Aeronautique et de l Espace
  • ,
  • Roger C. Wiens, Los Alamos National Laboratory

Located on top of the mast of the Mars 2020 Perseverance rover, the SuperCam instrument suite includes a microphone to record audible sounds from 100Hz to 10kHz on the surface of Mars. It will support SuperCam's Laser-Induced Breakdown Spectroscopy investigation by recording laser-induced shock-waves but it will also record aeroacoustic noise generated by wind flowing past the microphone. This experimental study was conducted in the Aarhus planetary wind-tunnel under low CO2 pressure with wind generated at several velocities. It focused on understanding the wind-induced acoustic signal measured by microphones instrumented in a real scale model of the rover mast as a function of the wind speed and wind orientation. Acoustic spectra recorded under a wind flow show that the low-frequency range of the microphone signal is mainly influenced by the wind velocity. In contrast, the higher frequency range is seen to depend on the wind direction relative to the microphone. On the one hand, for the wind conditions tested inside the tunnel, it is shown that the Root Mean Square of the pressure, computed over the 100Hz to 500Hz frequency range, is proportional to the dynamic pressure. Therefore, the SuperCam microphone will be able to estimate the wind speed, considering an in situ cross-calibration with the Mars Environmental Dynamic Analyzer. On the other hand, for a given wind speed, it is observed that the root mean square of the pressure, computed over the 500Hz to 2000Hz frequency range, is at its minimum when the microphone is facing the wind whereas it is at its maximum when the microphone is pointing downwind. Hence, a full 360∘ rotation of the mast in azimuth in parallel with sound recording can be used to retrieve the wind direction. We demonstrate that the SuperCam Microphone has a priori the potential to determine both the speed and the direction of the wind on Mars, thus contributing to atmospheric science investigations.

Original languageEnglish
Article number114060
JournalIcarus
Volume354
Number of pages12
ISSN0019-1035
DOIs
Publication statusPublished - Jan 2021

    Research areas

  • Atmosphere, Mars 2020 Perseverance rover, Mars microphone, SuperCam instrument, Wind orientation, Wind speed

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