选择耳垂作为测量部位,建立了多层耳垂组织仿真模型,利用Monte-Carlo方法研究了不同光源特性(光束半径,入射能量大小及分布等)及模型参数下耳垂组织模型的光透射能量及分布规律,由透射光能量分布、光电二极管光敏面积和探测灵敏度推出特定测量信噪比要求的入射光能量。研究结果表明,耳垂组织的实际入射光能量能够满足动态光谱检测的要求,获得了更高的动态光谱测量精度,可满足动态光谱法的血液成分检测的要求。

With selecting earlap as the measuring spot,a multi-layer simulation model of the earlap is established.The transmittance of the earlap model and its distribution regularities under vary beam properties(beam radius,the input energy and its distribution) and model parameters are researched by Monte-Carlo method.Then from the light energy distribution,the detective area and the detective sensitivity of the detector,the input energy needed for certain signal-noise ratio is calculated.It has been proved by research results that the practicable input energy of the earlap can meet the requirement of the acquisition of the dynamic spectrum,higher measurement accuracy of the dynamic spectrum also can meet the spectrum measurement accuracy in the noninvasive measurement of blood compositions.