Using Fresnel Zone to Characterise and Image Different Types of Diffractors in Low S/N Situations
We investigate the possibility to image and characterise the different types of diffractors – such as point, line, and edge – and separate them from reflections by limiting the aperture around the tangent point between the diffraction hyperbola and the relfection traveltime surface. To this end, we...
| Main Authors: | , |
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| Format: | Conference Paper |
| Published: |
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/11670 |
| _version_ | 1848747867824455680 |
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| author | Bona, Andrej Pevzner, Roman |
| author_facet | Bona, Andrej Pevzner, Roman |
| author_sort | Bona, Andrej |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We investigate the possibility to image and characterise the different types of diffractors – such as point, line, and edge – and separate them from reflections by limiting the aperture around the tangent point between the diffraction hyperbola and the relfection traveltime surface. To this end, we look at the tangents of the diffraction hyperbola with typical traveltime surfaces corresponding to the different diffrator types. We do this by studying the coherency of the recorded wavefield along the diffraction hyperbolae. The different types of diffractors show different energy distributions that can be used to characterise the diffractors and separate them from specular reflections. These areas of high energy correspond to the Fresnel zones of the particular diffractor type. Limiting the aperture of the diffraction hyperbola to the particular Fresnel zone results in improvement in S/N, while omitting the Fresnel zone corresponding to the reflections allows for imaging of the diffractors, which have larger Fresnels zones. |
| first_indexed | 2025-11-14T06:55:59Z |
| format | Conference Paper |
| id | curtin-20.500.11937-11670 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:55:59Z |
| publishDate | 2015 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-116702017-09-13T14:58:11Z Using Fresnel Zone to Characterise and Image Different Types of Diffractors in Low S/N Situations Bona, Andrej Pevzner, Roman We investigate the possibility to image and characterise the different types of diffractors – such as point, line, and edge – and separate them from reflections by limiting the aperture around the tangent point between the diffraction hyperbola and the relfection traveltime surface. To this end, we look at the tangents of the diffraction hyperbola with typical traveltime surfaces corresponding to the different diffrator types. We do this by studying the coherency of the recorded wavefield along the diffraction hyperbolae. The different types of diffractors show different energy distributions that can be used to characterise the diffractors and separate them from specular reflections. These areas of high energy correspond to the Fresnel zones of the particular diffractor type. Limiting the aperture of the diffraction hyperbola to the particular Fresnel zone results in improvement in S/N, while omitting the Fresnel zone corresponding to the reflections allows for imaging of the diffractors, which have larger Fresnels zones. 2015 Conference Paper http://hdl.handle.net/20.500.11937/11670 10.3997/2214-4609.201413009 restricted |
| spellingShingle | Bona, Andrej Pevzner, Roman Using Fresnel Zone to Characterise and Image Different Types of Diffractors in Low S/N Situations |
| title | Using Fresnel Zone to Characterise and Image Different Types of Diffractors in Low S/N Situations |
| title_full | Using Fresnel Zone to Characterise and Image Different Types of Diffractors in Low S/N Situations |
| title_fullStr | Using Fresnel Zone to Characterise and Image Different Types of Diffractors in Low S/N Situations |
| title_full_unstemmed | Using Fresnel Zone to Characterise and Image Different Types of Diffractors in Low S/N Situations |
| title_short | Using Fresnel Zone to Characterise and Image Different Types of Diffractors in Low S/N Situations |
| title_sort | using fresnel zone to characterise and image different types of diffractors in low s/n situations |
| url | http://hdl.handle.net/20.500.11937/11670 |