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Titel |
A radiation hardened digital fluxgate magnetometer for space applications |
VerfasserIn |
D. M. Miles, J. R. Bennest, I. R. Mann, D. K. Millling |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
2193-0856
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Digitales Dokument |
URL |
Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 2, no. 2 ; Nr. 2, no. 2 (2013-09-13), S.213-224 |
Datensatznummer |
250084920
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Publikation (Nr.) |
copernicus.org/gi-2-213-2013.pdf |
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Zusammenfassung |
Space-based measurements of Earth's magnetic field are required to
understand the plasma processes responsible for energising particles in the
Van Allen radiation belts and influencing space weather. This paper describes
a prototype fluxgate magnetometer instrument developed for the proposed
Canadian Space Agency's (CSA) Outer Radiation Belt Injection, Transport,
Acceleration and Loss Satellite (ORBITALS) mission and which has applications
in other space and suborbital applications. The magnetometer is designed to
survive and operate in the harsh environment of Earth's radiation belts
and measure low-frequency magnetic waves, the magnetic signatures of current
systems, and the static background magnetic field. The new instrument offers
improved science data compared to its predecessors through two key design
changes: direct digitisation of the sensor and digital feedback from two
cascaded pulse-width modulators combined with analog temperature
compensation. These provide an increase in measurement bandwidth up to
450 Hz with the potential to extend to at least 1500 Hz. The instrument can
resolve 8 pT on a 65 000 nT field with a magnetic noise of less than
10 pT/√Hz at 1 Hz. This performance is comparable with
other recent digital fluxgates for space applications, most of which use some
form of sigma-delta (ΣΔ) modulation for feedback and omit analog temperature
compensation. The prototype instrument was successfully tested and calibrated
at the Natural Resources Canada Geomagnetics Laboratory. |
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