Method of Multi-Angle Transmission Radiowave Tomography of Dielectric Objects
| Autor: | Dmitry Sukhanov, K. V. Zavyalova |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Diffraction
Opacity multi-angle sounding Wave propagation cross borehole radar 010103 numerical & computational mathematics 01 natural sciences lcsh:Technology lcsh:Chemistry Optics General Materials Science 0101 mathematics Instrumentation lcsh:QH301-705.5 Fluid Flow and Transfer Processes Physics radiowave tomography refraction index business.industry lcsh:T Process Chemistry and Technology backward wave propagation General Engineering Inverse problem lcsh:QC1-999 Computer Science Applications 010101 applied mathematics Wavelength Transmission (telecommunications) lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Tomography business transmission tomography lcsh:Engineering (General). Civil engineering (General) Refractive index lcsh:Physics |
| Zdroj: | Applied Sciences, Vol 10, Iss 3270, p 3270 (2020) Applied Sciences Volume 10 Issue 9 |
| ISSN: | 2076-3417 |
| Popis: | A method for solving the inverse problem for reconstructing the spatial distribution of dielectric permittivity from the results of multi-angle transmission broadband radiosounding is proposed. The method is based on inverse wave propagation. The average refractive index of the medium along the wave trajectory is calculated by comparing the results of the calculation of the time delay of the inverse signal in the entire sounding region and the forward propagation time in a homogeneous medium. This method takes into account diffraction effects in solving a direct problem, which allows one to obtain a resolution in the order of a wavelength. The combination of time delays obtained at different probing angles allows the restoration of the distribution of the refractive index in the medium. The paper presents the results of the numerical simulation of this method. The novelty of the proposed approach compared to the conventional back-projection algorithm is that ray approximation is not applied. Instead of the absorption coefficient (used in X-ray tomography), a time delay is considered, which is restored in the entire probed region. The developed method can be widely used in radiowave tomography or microwave tomography for remote non-destructive testing, diagnostics for the internal structures of inhomogeneous media and the restoration of the shapes of opaque objects based on multisensor sensing. |
| Databáze: | OpenAIRE |
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