Testing scattering codes against experimental data (direct problem)
Presentation
On this page, we propose experimental scattered fields measured for several 3D targets in the microwave domain. The amplitude and the phase of these complex fields have been measured by the HIPE group in the CCRM anechoic chamber with its spherical setup [1]. Particular care has been necessary to obtain these accurate quantitative measurements. Indeed, the setup has been optimized, a post-procedure has been applied to the fields to correct for drift phenomena [2]. Moreover, the remnant random noise has been fully characterized [3] and the measured fields have been calibrated using a reference target. We hope these measurements would be useful for people interested in validating their electromagnetic scattering modelling codes.The currently available targets are the following ones:
Aggregate of 74 spheres
This target is composed of 74 dielectric spheres of 5mm diameter, with a permittivity of 2.85.
Accurate comparisons between experimental scattered fields and simulated ones can be found in [4].
Example of comparisons measurements/simulations at 20GHz: [6]
Receivers and source in the same plane: red(meas.)/black(sim.)
Source out of the receivers plane: green(meas.)/blue(sim.)
Magnitude
Phase
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Canonical targets
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Itokawa analogue
This target is an analogue of the asteroid 25143 Itokawa rendezvoused by the Japanese space agency JAXA’s Hayabusa mission in 2005.
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All the targets permittivity have been measured with the commercial kit EpsiMu [5].
References
[1] J.-M. Geffrin, P. Sabouroux, C. Eyraud, "Free space experimental scattering database continuation : experimental set-up and measurement precision", Inverse Problems 21, S117 (2005) http://iopscience.iop.org/article/10.1088/0266-5611/21/6/S09/.
[2] C. Eyraud, J.-M. Geffrin, A. Litman, P. Sabouroux, H. Giovannini,
"Drift correction for scattering measurements",
Applied Physics Letters 89, 244104 (2006)
Copyright(2006) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied
Physics Letters and may be found at http://link.aip.org/link/?APL/89/244104.
[3] J-M Geffrin, C Eyraud, A Litman, and P Sabouroux,
"Optimization of a bistatic microwave scattering measurement setup : from high to low scattering targets", Radio Science, 44:RS2007, (2009) http://www.agu.org/pubs/crossref/2009/2008RS003837.shtml.
[4] O Merchiers, J-M Geffrin, R Vaillon, P Sabouroux, B Lacroix,
"Microwave analog to light scattering measurements on a fully characterized complex aggregate", Applied Physics Letters, 94:181107, (2009).
Copyright(2009) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied
Physics Letters and may be found at http://link.aip.org/link/?APL/89/244104.
[5] P. Sabouroux, P. Boschi, "EpsiMu: A new microwave materials
measurement kit", Revue de l'Electricité et de l'Electronique 10,
pp. 58-62 (2005).
[6] O. Merchier, C. Eyraud, J.-M. Geffrin, R. Vaillon, B. Stout, P. Sabouroux, B. Lacroix,
"Microwave measurements of the full amplitude scattering matrix of a complex aggregate: a database for the asssessment of light scattering codes", Optics Express, Vol. 18 Issue 3, pp.2056-2075 (2010).
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