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- W3100599254 abstract "Non destructive investigation of soil properties is crucial when trying to identify inhomogeneities in the ground or the presence of conductive substances. This kind of survey can be addressed with the aid of electromagnetic induction measurements taken with a ground conductivity meter. In this paper, starting from electromagnetic data collected by this device, we reconstruct the electrical conductivity of the soil with respect to depth, with the aid of a regularized damped Gauss–Newton method. We propose an inversion method based on the low-rank approximation of the Jacobian of the function to be inverted, for which we develop exact analytical formulae. The algorithm chooses a relaxation parameter in order to ensure the positivity of the solution and implements various methods for the automatic estimation of the regularization parameter. This leads to a fast and reliable algorithm, which is tested on numerical experiments both on synthetic data sets and on field data. The results show that the algorithm produces reasonable solutions in the case of synthetic data sets, even in the presence of a noise level consistent with real applications, and yields results that are compatible with those obtained by electrical resistivity tomography in the case of field data." @default.
- W3100599254 created "2020-11-23" @default.
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- W3100599254 date "2014-12-01" @default.
- W3100599254 modified "2023-10-14" @default.
- W3100599254 title "Regularized solution of a nonlinear problem in electromagnetic sounding" @default.
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- W3100599254 doi "https://doi.org/10.1088/0266-5611/30/12/125014" @default.
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