The electromagnetic response of human skin in the millimetre and submillimetre wave range
The electromagnetic response of human skin in the millimetre and submillimetre wave range
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DOI：
10.1088/0031-9155/54/11/005
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发表时间：
2009-06-07
影响因子：
3.5
通讯作者：
Agranat, Aharon J.
中科院分区：
文献类型：
--
作者：
Feldman, Yuri;Puzenko, Alexander;Agranat, Aharon J.
最近通过光学相干断层扫描对皮肤的微小形态进行的研究表明，人体皮肤中的汗管是螺旋形的管，充满了导电的水溶液。这一点，连同真皮的介电常数高于表皮的介电常数的事实，提出了假设，作为电磁实体，汗管可以被视为低Q螺旋天线。通过电磁模拟和在不同生理条件下受试者皮肤的体内反射率的实验进一步研究了该陈述的含义（Feldman等人，2008 Phys. Rev. Lett. 100 128102）。仿真和实验结果是在一个很好的协议，都表明，在皮肤中的汗管确实可以表现为低Q天线。因此，亚太赫兹区域中的皮肤光谱响应由排汗系统的活动水平控制，并且在75-110 GHz的频带中的某些频率处显示出反射率的最小值。它也与生理应激相关，如脉搏率和收缩压所表现的。因此，它有可能成为遥感的生理参数和精神状态的检查对象的基本原则。
Recent studies of the minute morphology of the skin by optical coherence tomography revealed that the sweat ducts in human skin are helically shaped tubes, filled with a conductive aqueous solution. This, together with the fact that the dielectric permittivity of the dermis is higher than that of the epidermis, brings forward the supposition that as electromagnetic entities, the sweat ducts could be regarded as low Q helical antennas. The implications of this statement were further investigated by electromagnetic simulation and experiment of the in vivo reflectivity of the skin of subjects under varying physiological conditions (Feldman et al 2008 Phys. Rev. Lett. 100 128102). The simulation and experimental results are in a good agreement and both demonstrate that sweat ducts in the skin could indeed behave as low Q antennas. Thus, the skin spectral response in the sub-Terahertz region is governed by the level of activity of the perspiration system and shows the minimum of reflectivity at some frequencies in the frequency band of 75-110 GHz. It is also correlated to physiological stress as manifested by the pulse rate and the systolic blood pressure. As such, it has the potential to become the underlying principle for remote sensing of the physiological parameters and the mental state of the examined subject.