Terahertz time-gated spectral imaging for content extraction through layered structures
Spatial resolution, spectral contrast and occlusion are three major bottlenecks for non-invasive inspection of complex samples with current imaging technologies. We exploit the sub-picosecond time resolution along with spectral resolution provided by terahertz time-domain spectroscopy to computation...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Nature Publishing Group
2017
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| Online Access: | http://hdl.handle.net/1721.1/108388 https://orcid.org/0000-0003-0768-4815 https://orcid.org/0000-0002-3254-3224 |
| _version_ | 1826195554209628160 |
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| author | Aghasi, Alireza Romberg, Justin Redo-Sanchez, Albert Heshmat Dehkordi, Barmak Naqvi, Salman Zhang, Mingjie Raskar, Ramesh |
| author2 | Massachusetts Institute of Technology. Media Laboratory |
| author_facet | Massachusetts Institute of Technology. Media Laboratory Aghasi, Alireza Romberg, Justin Redo-Sanchez, Albert Heshmat Dehkordi, Barmak Naqvi, Salman Zhang, Mingjie Raskar, Ramesh |
| author_sort | Aghasi, Alireza |
| collection | MIT |
| description | Spatial resolution, spectral contrast and occlusion are three major bottlenecks for non-invasive inspection of complex samples with current imaging technologies. We exploit the sub-picosecond time resolution along with spectral resolution provided by terahertz time-domain spectroscopy to computationally extract occluding content from layers whose thicknesses are wavelength comparable. The method uses the statistics of the reflected terahertz electric field at subwavelength gaps to lock into each layer position and then uses a time-gated spectral kurtosis to tune to highest spectral contrast of the content on that specific layer. To demonstrate, occluding textual content was successfully extracted from a packed stack of paper pages down to nine pages without human supervision. The method provides over an order of magnitude enhancement in the signal contrast and can impact inspection of structural defects in wooden objects, plastic components, composites, drugs and especially cultural artefacts with subwavelength or wavelength comparable layers. |
| first_indexed | 2024-09-23T10:14:33Z |
| format | Article |
| id | mit-1721.1/108388 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:14:33Z |
| publishDate | 2017 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | mit-1721.1/1083882022-09-30T19:52:33Z Terahertz time-gated spectral imaging for content extraction through layered structures Aghasi, Alireza Romberg, Justin Redo-Sanchez, Albert Heshmat Dehkordi, Barmak Naqvi, Salman Zhang, Mingjie Raskar, Ramesh Massachusetts Institute of Technology. Media Laboratory Program in Media Arts and Sciences (Massachusetts Institute of Technology) Redo-Sanchez, Albert Heshmat Dehkordi, Barmak Naqvi, Salman Zhang, Mingjie Raskar, Ramesh Spatial resolution, spectral contrast and occlusion are three major bottlenecks for non-invasive inspection of complex samples with current imaging technologies. We exploit the sub-picosecond time resolution along with spectral resolution provided by terahertz time-domain spectroscopy to computationally extract occluding content from layers whose thicknesses are wavelength comparable. The method uses the statistics of the reflected terahertz electric field at subwavelength gaps to lock into each layer position and then uses a time-gated spectral kurtosis to tune to highest spectral contrast of the content on that specific layer. To demonstrate, occluding textual content was successfully extracted from a packed stack of paper pages down to nine pages without human supervision. The method provides over an order of magnitude enhancement in the signal contrast and can impact inspection of structural defects in wooden objects, plastic components, composites, drugs and especially cultural artefacts with subwavelength or wavelength comparable layers. 2017-04-24T20:45:59Z 2017-04-24T20:45:59Z 2016-09 2015-09 Article http://purl.org/eprint/type/JournalArticle 2041-1723 http://hdl.handle.net/1721.1/108388 Redo-Sanchez, Albert et al. “Terahertz Time-Gated Spectral Imaging for Content Extraction through Layered Structures.” Nature Communications 7 (2016): 12665. https://orcid.org/0000-0003-0768-4815 https://orcid.org/0000-0002-3254-3224 en_US http://dx.doi.org/10.1038/ncomms12665 Nature Communications Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf Nature Publishing Group Nature |
| spellingShingle | Aghasi, Alireza Romberg, Justin Redo-Sanchez, Albert Heshmat Dehkordi, Barmak Naqvi, Salman Zhang, Mingjie Raskar, Ramesh Terahertz time-gated spectral imaging for content extraction through layered structures |
| title | Terahertz time-gated spectral imaging for content extraction through layered structures |
| title_full | Terahertz time-gated spectral imaging for content extraction through layered structures |
| title_fullStr | Terahertz time-gated spectral imaging for content extraction through layered structures |
| title_full_unstemmed | Terahertz time-gated spectral imaging for content extraction through layered structures |
| title_short | Terahertz time-gated spectral imaging for content extraction through layered structures |
| title_sort | terahertz time gated spectral imaging for content extraction through layered structures |
| url | http://hdl.handle.net/1721.1/108388 https://orcid.org/0000-0003-0768-4815 https://orcid.org/0000-0002-3254-3224 |
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