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| Titel |
Testing the three axis magnetometer and gradiometer MOURA and data comparison on San Pablo de los Montes Observatory. |
| VerfasserIn |
Ana Belen Fernandez, Ruy Sanz, Pablo Covisa, José Manuel Tordesillas, Marina Díaz-Michelena |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072007
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| Zusammenfassung |
| A magnetometer and gradiometer named MOURA has been developed with the
objective to measure the magnetic field on Mars in the frame of Mars MetNet Precursor
Mission (MMPM) [1]. MOURA is a compact, miniaturized, intelligent and low cost
instrument, based on two sets of triaxial magnetometers separated one centimeter
from each other to do gradiometry studies. It has a resolution of 2.2 nT, and a field
range of + 65μT, which can be extended to +130 μT when sensors are saturated.
[2]
These sensor heads are Anisotropic MagnetoResistances (AMR) Commercial-Off-The-Shelf
(COTS) by Honeywell, specifically HMC1043, which has been selected due to their relative
low consumption, weight and size, factors very important for the mission with very limited
mass and power budget (shared 150 g for three full payloads). Also, this technology has been
previously successfully employed on board Unmanned Aerial Vehicles (UAV) to perform
geomagnetic surveys in extreme conditions areas [3], and in several space missions for
different applications. [4]
After the development of the MOURA Engineering Qualification Model (EQM) in
November 2011, an exhaustive set of tests have been performed to validate and fully
characterize the instrument. Compensation equations have been derived for the temperature
corrections in the operation range (between -135 ºC and 30 ºC) in controlled environments.
These compensation equations have been applied to field data, which have shown to follow
the daily Earth´s magnetic field variations as registered by San Pablo Geomagnetic
Observatory (IAGA code: SPT) (available at www.ign.es and www.intermagnet.org) with
deviations lower than 40 nT. These deviations were attributed to several error factors as the
different locations between MOURA and SPT and other possible different geomagnetic
conditions.
Due to the above, a measurement campaign on SPT installations are been done. The main
objective is to compare MOURA measurements on a relevant environment, with data
obtained by SPT magnetometers. This is considered the last step prior to Mars in situ
measurements.
SPT employs for geomagnetic observations a fluxgate magnetometer FGE-Danish
Meteorological Institute and a fluxgate vector magnetometer Geomag M390, both
equipped with Overhauser effect magnetometers GSM90. The conditions into the
rooms that contain these instruments are controlled. The equipments are situated on
several pillars fixed strategically at Earth surface avoiding vibrations and other Earth
movement that could affect measurement due to changes on the sensor position, the
region is magnetically clean and the temperature variation is very low. Magnetic
measurements are performed by MOURA for several days located on one of these pillars.
These measurements are compared with SPT reference instrumentation with the
aim to obtain a direct and very accurate evaluation of MOURA facing reference
instrumentation.
http://metnet.fmi.fi/index.php
Development of miniaturized instrumentation for Planetary Exploration and its
application to the Mars MetNet Precursor Mission. H. Guerrero et al. EGU
General Assembly 2010, held 2-7 May, 2010 in Vienna, Austria, p.13330
Funaki, M.; Hirasawa, N.; and the Ant-Plane Group. Outline of a small
unmanned aerial vehicle (Ant-Plane) designed for Antartic research. Polar
Science 2008, 2, 129-142.
M. Diaz-Michelena Sensors 2009, 9(4), 2271-2288 |
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