2017 Fiscal Year Research-status Report
Human sweat duct as a helical antenna: experimental investigation
| Project/Area Number |
17K19075
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| Research Institution | Shizuoka University |
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Principal Investigator |
トリパティ サロジ 静岡大学, 工学部, 准教授 (20648729)
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| Project Period (FY) |
2017-06-30 – 2019-03-31
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| Keywords | Terahertz / sweat duct / helical antenna / OCT |
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| Outline of Annual Research Achievements |
The morphological structure of the human sweat ducts embedded in the epidermis resembles a helix. Their topology, coupled with the dielectric properties of skin led to the concept that these coiled sections would have an electromagnetic response in the millimeter and terahertz (THz) frequency range and it presents the intriguing possibility that it could act as a low Q - factor helical antenna in the terahertz frequency band. According to the antenna theory, a helical antenna resonates in two different modes of operation known as normal mode and axial mode and the dimension of the helix plays a key role to determine the frequency of resonance. Therefore, based upon the morphological details of the sweat duct, we reported the frequency of resonance of sweat duct in axial mode of operation. During the year 2017, we thoroughly investigated the morphological structure of human sweat duct measured by optical coherence tomography and we estimated the frequency of the resonance of the human sweat duct in a normal mode of operation. This result was published in international journal and was presented in an international conference. In order to further investigate the frequency of resonance, we developed terahertz time domain spectroscopy system with the facility to measure the attenuated total reflection from the skin.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
In the previous year, we thoroughly analyzed the image data obtained by OCT in order to investigate morphological parameters of human sweat duct. We then calculated the frequency of resonance in normal mode along with axial mode of operation. In order to investigate the frequency of resonance, we have developed the terahertz time domain spectroscopy system with the facility to measure the attenuated total reflection from the human palm, where we designed a Silicon prism and developed data acquisition system. We also studied the axial mode of operation using electromagnetic simulation. Beside this, we are investigating the possible correlation of terahertz reflection from palm to other physiological parameters such as skin conductance in order to find any possible relationship.
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| Strategy for Future Research Activity |
In the year 2018, we will mainly focus on experiment along with some electromagnetic simulation. We have developed a terahertz time domain spectroscopy in attenuated total reflection mode, which covers frequency range from 150 GHz to 2 THz. In order to optimize the performance of measurement system and to properly measure the reflected signal from the palm, we will perform electromagnetic simulation using CST software by selecting different measurement regions on the palm based upon the density of the sweat duct, their number of turn and the diameter of the sweat duct. Besides this, we will develop the measurement protocol in order to investigate the reflection from the palm of the subjects. All the results obtained from the THz wave measurement must be treated statistically to account for the natural variation of the human condition, since no two people will react in the same way or have the same physiology. Therefore, we will develop a statistical analysis method to account the natural variation of subjects during experiment. Finally, the results obtained from simulation and experiments will be published in international journal and conference proceedings.
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| Causes of Carryover |
At the beginning, we had a plan to use continuous wave (CW) terahertz source for the measurement of the terahertz reflection from palm. However, we later figured out that it requires long data acquisition time while tuning the frequency from 100 GHz to 2THz. Therefore, we decided to use a terahertz time domain spectroscopy (THz-TDS)in attenuated total reflection geometry. Since, it takes only several seconds to record the time domain signal using terahertz time domain spectroscopy, it enables us to measure the data and identify the frequency of resonance while the subject is under certain type of stress. However, the frequency resolution of this system is compromised due to short data acquisition time. Therefore, we will use continues wave terahertz system once the resonating frequency band of the sweat duct is identified using terahertz time domain spectroscopy.
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Research Products
(5 results)
