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Proceedings Paper

Morphological study of human sweat ducts for the investigation of THz-wave interaction (Conference Presentation)
Author(s): Kodo Kawase; Saroj R. Tripathi
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Paper Abstract

Recently, some studies reported that the sweat ducts act as a low-Q-factor helical antenna due to their helical structure, and resonate in the terahertz frequency range according to their structural parameters. According to the antenna theory, when the duct works as a helical antenna, the dimension of the helix plays a key role to determine the frequency of resonance. Therefore, the accurate determination of structural parameters of sweat duct is crucially important to obtain the reliable frequency of resonance and modes of operations. Therefore, here we performed the optical coherence tomography (OCT) of human subjects on their palm and foot to investigate the density, distribution and morphological features of sweat ducts. Moreover, we measured the dielectric properties of stratum corneum using terahertz time domain spectroscopy and based upon this information, we determined the frequency of resonance. We recruited 32 subjects for the measurement and the average duct diameter was 95±11μm. Based upon this information on diameter of duct and THz dielectric properties of stratum corneum (ε=5.1±1.3), we have calculated the frequency of resonance of sweat duct. Finally, we determined that the center frequency of resonance was 442±76 GHz. We believe that these findings will facilitate further investigation of the THz-skin interaction and provide guidelines for safety levels with respect to human exposure. We will also report on the EEG measurement while being shined by micro watt order THz waves.

Paper Details

Date Published: 3 May 2016
PDF: 1 pages
Proc. SPIE 9706, Optical Interactions with Tissue and Cells XXVII, 970609 (3 May 2016); doi: 10.1117/12.2211618
Show Author Affiliations
Kodo Kawase, Nagoya Univ. (Japan)
Saroj R. Tripathi, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 9706:
Optical Interactions with Tissue and Cells XXVII
E. Duco Jansen, Editor(s)

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