| 研究課題/領域番号 |
21K04174
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| 研究機関 | 静岡大学 |
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研究代表者 |
トリパティ サロジ 静岡大学, 工学部, 准教授 (20648729)
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| 研究期間 (年度) |
2021-04-01 – 2024-03-31
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| キーワード | terahertz / skin / sweat duct / helix |
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| 研究実績の概要 |
It was reported that the terahertz (THz) wave interacts with human skin at a certain frequency because of the presence of helical structured sweat duct in the epidermis. This frequency depends upon the morphological features of the sweat duct along with the dielectric properties of skin and sweat. Therefore, we studied dielectric properties of human sweat using THz time domain spectroscopy and we found that the real and imaginary part of sweat decreases with the increase in frequency.
Another part of this study is the measurement of the polarization sensitive reflectance of skin. Therefore, we developed polarizers made of a two-dimensional array of metallic helix, which produce both right and left circularly polarized THz wave based upon the winding of the helix used in the polarizer.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
Our first objective of this project was to design a polarization sensitive THz time domain spectroscopy system. Therefore, we developed a circular polarizer made of metallic helix array that can produce either left or right circularly polarized THz wave. The frequency band of the circularly polarized wave cannot completely cover the possible frequency of resonance of the sweat duct. Therefore, we are optimizing the size of the metallic helix using electromagnetic wave simulation.
During the experiment, we noted that the dielectric properties of the sweat play an important role in THz wave interaction with skin. Therefore, we developed an attenuated total reflection spectroscopy system and measured the dielectric properties of the sweat in the frequency range of 200 GHz to 2.5 THz.
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| 今後の研究の推進方策 |
A fiber coupled terahertz time domain spectroscopy will be developed to conduct a polarization sensitive terahertz time domain measurement of human skin. Here, a polarizer made of metallic helix array will be used to produce circularly polarized terahertz wave. This experiment enables us to understand how left and right-handed circularly polarized wave interacts with skin and sweat duct. In the next step, some physiological signals such as heart rate and heart rate variability will also be measured using photoplethysmography while measuring the terahertz reflectance from the skin. The correlation between the terahertz reflectance and physiological signals will be investigated and the possibility to remotely sense the biophysical signal will be explored.
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| 次年度使用額が生じた理由 |
I planned to attend and present my research results in an international conference in September 2021, but it was not possible due to the current situation of Covid pandemic. Therefore, the budget allocated for the conference attendance remain unused. This budget will be used in 2022 to attend the national or international conference.
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