Monte-Carlo仿真酒精特征波长光子在皮肤中的传输规律及光纤探头设计

用蒙特卡罗(Monte-Carlo)方法研究酒精特征波长的光子在皮肤组织中的传输规律,从而确定酒精光谱的最佳检测距离,为应用近红外光谱进行人体酒精无创检测提供理论依据。通过建立皮肤4层结构模型,确定了在酒精特征波长(1694nm、1735nm、2266nm、2308nm)下该模型的光学参数。利用Monte-Carlo方法对该模型仿真可得到结论:1694nm、1735nm波长光子的最佳检测半径为650μm,2266nm、2308nm波长光子的最佳检测半径为450μm;半径在200～1000μm之间时,出射点的光子密度随检测半径的增加呈幂函数形式递减,检测到的光子数随检测宽度的增加大致呈线性递增。利用上述结果,设计了用于人体酒精无创检测的光纤探头,选用TE制冷型的InGaAs检测器作为光子检测器。

Monte-Carlo simulation of photons transmission at alcohol wavelength in skin tissue and design of fiber optic probe

 The transmission characteristics of photons in the skin tissue at alcohol wavelength were studied by using Monte-Carlo simulation method in this study. A four layer skin structure model was established in which the optical parameter was determined at alcohol wavelength (1694nm, 1735nm, 2266nm, 2308nm). The Monte-Carlo simulations results showed that the optimal detection distance was 650μm at 1694nm and 1735nm, 450μm at 2266nm and 2308nm. The photons densities showed a decline trend with the increase of detection distance r in the range from 200μm to 1000μm. The number of detected photons increases linearly with the detection width. Based on the above results, an optical fiber probe for alcohol non-invasive testing was designed, and the TE-cooled InGaAs detector was optimized.