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Surface electrical properties experimentThe surface electrical properties (SEP) experiment was used to explore the subsurface material of the Apollo 17 landing site by means of electromagnetic radiation. The experiment was designed to detect electrical layering, discrete scattering bodies, and the possible presence of water. From the analysis of the data, it was expected that values of the electrical properties (dielectric constant and loss tangent) of lunar material in situ would be obtained. The basic principle of the SEP experiment is interferometry. This principle involves only the interference of two or more waves to produce an interference pattern. The inversion of the interference pattern in terms of the spatial distribution of the electrical properties is the basic aim of the experiment (fig. 15-1). The experiment is most easily understood in terms of a single dipole antenna for radiating electromagnetic energy and a loop receiver for measuring the magnitudes of the fields.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Simmons, G.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Strangway, D.
(NASA Johnson Space Center Cambridge, MA, United States)
Annan, P.
(Toronto Univ. Cambridge, MA, United States)
Baker, R.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Bannister, L.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Brown, R.
(Massachusetts Inst. of Tech.)
Cooper, W.
(Massachusetts Inst. of Tech.)
Cubley, D.
(NASA Johnson Space Center)
Debettencourt, J.
(Raytheon Co.)
England, A. W.
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Publication Information
Publication: NASA. Johnson Space Center Apollo 17 Prelim. Sci. Rept.
Subject Category
Space Sciences
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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