Title:
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Spherical wind sensor for the atmosphere of mars
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Author:
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Kowalski, Lukasz; Atienza García, María Teresa; Gorreta Mariné, Sergio; Jiménez Serres, Vicente; Domínguez Pumar, Manuel; Silvestre Bergés, Santiago; Castañer Muñoz, Luis María
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. MNT - Grup de Recerca en Micro i Nanotecnologies |
Abstract:
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A novel wind speed and direction sensor designed
for the atmosphere of Mars is described. It is based on a spherical
shell divided into four triangular sectors according to the central
projection of tetrahedron onto the surface of the unit sphere.
Each sector is individually controlled to be heated above the
ambient temperature independently of the wind velocity and incidence
angle. A convection heat rate model of four hot spherical
triangles under forced wind has been built with finite element
method thermal-fluidic simulations. The angular sensitivity of the
tetrahedral sphere structure has been theoretically determined
and compared with the tessellation of the sphere by four biangles.
A 9-mm-diameter prototype has been assembled using 3-D printing
of the spherical shell housing in the interior commercial
platinum resistors connected to an extension of a custom
design printed board. Measurements in Martianlike atmosphere
demonstrate sensor responsiveness to the flow in the velocity
range 1–13 m/s at 10-mBar CO2 pressure. Numerical modelization
of the sensor behavior allows to devise an inverse algorithm
to retrieve the wind direction data from the raw measurements
of the power delivered to each spherical sector. The functionality
of the inverse algorithm is also demonstrated. |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesura::Sensors i actuadors -Anemometer -Mars -wind sensor -tetrahedral sphere -thermal
anemometer -low pressure atmosphere. -Anemòmetres -Meteorologia -- Instruments |
Rights:
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Document type:
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Article - Submitted version Article |
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