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Infrared Irradiation of Skin for the Development of Non-invasive Health Monitoring Technologies

机译：红外辐射对皮肤的无创健康监测技术的发展

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Infrared radiation was employed to study the optical transmission properties of pigskin and the factors that influence transmission at room temperature. The skin samples from the forehead of piglets were irradiated using an infrared-pulsed source by varying the beam properties such as optical power, power density, duty cycle, as well as sample thickness. Because infrared radiation in select instances can penetrate through thick-fleshy skin more easily than visible radiation, temperature fluctuations observed within the skin samples stemming from exposure-dependent absorption revealed interesting transmission properties and the limits of optical exposure. Pigskin was selected for this study since its structure most closely resembles that of human skin. Furthermore, the pulsed beam technique compared to continuous operation offers more precise control of heat generation within the skin. Through this effort, the correlated pulsed-beam parameters that influence infrared transmission were identified and varied to minimize the internal absorption losses through the dermis layers. The two most significant parameters that reduce absorption losses were frequency and duty cycle of the pulsed beam. Using the Bouger-Beer-Lambert Law, the absorption coefficient from empirical data is approximated, while accepting that the absorption coefficient is neither uniform nor linear. Given that the optical source used in this study was single mode, the infrared spectra obtained from irradiated samples also reveal characteristics of the skin structure. Realization of appropriate sample conditions and exposure parameters that reduce light attenuation within the skin and sample degradation could give way to novel non-invasive measuring techniques for health monitoring purposes.
机译：红外辐射用于研究猪皮的光学透射特性以及在室温下影响透射率的因素。通过改变光束特性（例如光功率，功率密度，占空比和样品厚度），使用红外脉冲源辐照来自仔猪前额的皮肤样品。因为在某些情况下，红外辐射比可见辐射更容易穿透肉厚的皮肤，所以在皮肤样本中观察到的由依赖于曝光的吸收引起的温度波动显示出令人关注的透射特性和光暴露的极限。选择猪皮进行此项研究是因为其结构与人类皮肤最相似。此外，与连续操作相比，脉冲束技术可以更精确地控制皮肤内的热量生成。通过这项工作，识别并改变了影响红外透射的相关脉冲束参数，以使通过真皮层的内部吸收损耗最小。减少吸收损耗的两个最重要的参数是脉冲束的频率和占空比。使用Bouger-Beer-Lambert定律，可以从经验数据中近似吸收系数，同时接受吸收系数既不是均匀也不是线性的。考虑到本研究中使用的光源是单模的，从辐照样品获得的红外光谱也揭示了皮肤结构的特征。减少皮肤内光衰减和样品降解的合适样品条件和曝光参数的实现可以让位于用于健康监测目的的新型非侵入性测量技术。

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