Imperial College London
Alternate

Emeritus ProfessorStevenSchwartz

Faculty of Natural Sciences, Department of Physics

Distinguished Research Fellow
 
 
 
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Contact

 

s.schwartz Website

 
 
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Assistant

 

Mr Luke Kratzmann +44 (0)20 7594 7770

 
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Location

 

708BHuxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Pudney:2013:10.5194/gi-2-249-2013,
author = {Pudney, MA and Carr, CM and Schwartz, SJ and Howarth, SI},
doi = {10.5194/gi-2-249-2013},
journal = {Geoscientific Instrumentation, Methods and Data Systems},
pages = {249--255},
title = {Near-magnetic-field scaling for verification of spacecraft equipment},
url = {http://dx.doi.org/10.5194/gi-2-249-2013},
volume = {2},
year = {2013}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Magnetic-field measurements are essential tothe success of many scientific space missions. Outside ofthe earth’s magnetic field the biggest potential source ofmagnetic-field contamination of these measurements is emittedby the spacecraft. Spacecraft magnetic cleanliness is enforcedthrough the application of strict ground verificationrequirements for spacecraft equipment and instruments. Dueto increasingly strict AC magnetic-field requirements, manyspacecraft units cannot be verified on the ground using existingtechniques. These measurements must instead be takenclose to the equipment under test (EUT) and then extrapolated.A traditional dipole power law of −3 (with a fieldfall-off proportional to r−3) cannot be applied at these closedistances without risk of underestimating the field emitted bythe EUT, but we demonstrate that a power law of −2 is tooconservative. We propose a compromise that uses a powerlaw of −2 up to a distance equal to 3 times the unit size, beyondwhich a dipole power law can be applied. When extrapolatingfrom a distance of 0.20 m to 1.00 m from the centre ofa 0.20 m wide EUT, we demonstrate that this method avoidsan under prediction of the field, and is at least twice as accurateas performing the extrapolation with a fixed power lawof −2.
AU  - Pudney,MA
AU  - Carr,CM
AU  - Schwartz,SJ
AU  - Howarth,SI
DO  - 10.5194/gi-2-249-2013
EP  - 255
PY  - 2013///
SN  - 2193-0864
SP  - 249
TI  - Near-magnetic-field scaling for verification of spacecraft equipment
T2  - Geoscientific Instrumentation, Methods and Data Systems
UR  - http://dx.doi.org/10.5194/gi-2-249-2013
UR  - http://hdl.handle.net/10044/1/41849
VL  - 2
ER  -
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