Distance Measurement of a Frequency-Shifted Sub-Terahertz Wave Source
In this paper, we report the development of a frequency-shifted (FS) terahertz (THz) wave source for the non-destructive inspection of buildings. Currently, terahertz-time domain spectroscopy (THz-TDS) is the mainstream method for non-destructive inspection using THz waves. However, THz-TDS is limit...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-02-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/9/3/128 |
| _version_ | 1797443471825436672 |
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| author | Minoru Honjo Koji Suizu Masaki Yamaguchi Tomofumi Ikari |
| author_facet | Minoru Honjo Koji Suizu Masaki Yamaguchi Tomofumi Ikari |
| author_sort | Minoru Honjo |
| collection | DOAJ |
| description | In this paper, we report the development of a frequency-shifted (FS) terahertz (THz) wave source for the non-destructive inspection of buildings. Currently, terahertz-time domain spectroscopy (THz-TDS) is the mainstream method for non-destructive inspection using THz waves. However, THz-TDS is limited by its measurement range and difficulties encountered when there is a strong frequency dependence in the absorption characteristics and refractive index of the measurement target. To address these issues, we developed a novel non-destructive approach for inspection applications using frequency-shifted THz waves. Our system uses a frequency-shifted feedback (FSF) laser as the pump light source to generate FS-THz waves; this allowed us to obtain precise distance measurements of objects over a broad range of distances. We tested a prototype FS-THz system and confirmed successful measurement of spatial distances inside a building material. |
| first_indexed | 2024-03-09T12:57:32Z |
| format | Article |
| id | doaj.art-11cb17ed23644e3b8e06166284867d40 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-09T12:57:32Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-11cb17ed23644e3b8e06166284867d402023-11-30T21:58:35ZengMDPI AGPhotonics2304-67322022-02-019312810.3390/photonics9030128Distance Measurement of a Frequency-Shifted Sub-Terahertz Wave SourceMinoru Honjo0Koji Suizu1Masaki Yamaguchi2Tomofumi Ikari3Department of Information and Communication Systems Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, JapanDepartment of Information and Communication Systems Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, JapanDepartment of Information and Communication Systems Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, JapanSpectra Design Ltd., 285-1 Yuzukami, Otahara 324-0403, JapanIn this paper, we report the development of a frequency-shifted (FS) terahertz (THz) wave source for the non-destructive inspection of buildings. Currently, terahertz-time domain spectroscopy (THz-TDS) is the mainstream method for non-destructive inspection using THz waves. However, THz-TDS is limited by its measurement range and difficulties encountered when there is a strong frequency dependence in the absorption characteristics and refractive index of the measurement target. To address these issues, we developed a novel non-destructive approach for inspection applications using frequency-shifted THz waves. Our system uses a frequency-shifted feedback (FSF) laser as the pump light source to generate FS-THz waves; this allowed us to obtain precise distance measurements of objects over a broad range of distances. We tested a prototype FS-THz system and confirmed successful measurement of spatial distances inside a building material.https://www.mdpi.com/2304-6732/9/3/128distance measurementFSF laserFS terahertz wavesnon-destructive inspectionOFDR |
| spellingShingle | Minoru Honjo Koji Suizu Masaki Yamaguchi Tomofumi Ikari Distance Measurement of a Frequency-Shifted Sub-Terahertz Wave Source Photonics distance measurement FSF laser FS terahertz waves non-destructive inspection OFDR |
| title | Distance Measurement of a Frequency-Shifted Sub-Terahertz Wave Source |
| title_full | Distance Measurement of a Frequency-Shifted Sub-Terahertz Wave Source |
| title_fullStr | Distance Measurement of a Frequency-Shifted Sub-Terahertz Wave Source |
| title_full_unstemmed | Distance Measurement of a Frequency-Shifted Sub-Terahertz Wave Source |
| title_short | Distance Measurement of a Frequency-Shifted Sub-Terahertz Wave Source |
| title_sort | distance measurement of a frequency shifted sub terahertz wave source |
| topic | distance measurement FSF laser FS terahertz waves non-destructive inspection OFDR |
| url | https://www.mdpi.com/2304-6732/9/3/128 |
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