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| Titel |
Near-magnetic-field scaling for verification of spacecraft equipment |
| VerfasserIn |
M. A. Pudney, C. M. Carr, S. J. Schwartz, S. I. Howarth |
| 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 (2013-11-14), S.249-255 |
| Datensatznummer |
250084923
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| Publikation (Nr.) |
 copernicus.org/gi-2-249-2013.pdf |
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| Zusammenfassung |
| Magnetic-field measurements are essential to the success of many scientific
space missions. Outside of the earth's magnetic field the biggest potential
source of magnetic-field contamination of these measurements is emitted by
the spacecraft. Spacecraft magnetic cleanliness is enforced through the
application of strict ground verification requirements for spacecraft
equipment and instruments. Due to increasingly strict AC magnetic-field
requirements, many spacecraft units cannot be verified on the ground using
existing techniques. These measurements must instead be taken close to the
equipment under test (EUT) and then extrapolated. A traditional dipole power
law of −3 (with a field fall-off proportional to r−3)
cannot be applied at these close distances without risk of underestimating
the field emitted by the EUT, but we demonstrate that a power law of −2 is
too conservative. We propose a compromise that uses a power law of −2 up to a
distance equal to 3 times the unit size, beyond which a dipole power law can
be applied. When extrapolating from a distance of 0.20 m to 1.00 m from the
centre of a 0.20 m wide EUT, we demonstrate that this method avoids an
under prediction of the field, and is at least twice as accurate as performing
the extrapolation with a fixed power law of −2. |
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