血氧传感器中光源与探测器距离的研究

Study on the Distance between Light Source and Detector in Blood Oxygen Sensor

为研究光密度空间分布的规律,分析了近红外光经过人体组织时的漫射路径,研究了基于近似漫射解的组织血氧饱和度算法,提出了检测光密度空间分布的方法并搭建系统进行测试。结果表明:不同波长的近红外光在手臂组织中有不同的光密度空间分布,对于波长为850、940 nm的近红外光,光密度空间分布的线性区分别在20~40 mm、20~35 mm。传感器中光源到探测器的距离应选择在光密度空间分布的公共线性区。研究结果对探究组织中光密度的空间分布和设计组织血氧传感器结构具有指导意义。

Reasonable structure design of oxygen sensor is the premise of accurate detection of oxygen saturation in human tissues. The reasonable position of detector and light source is determined by the linear region of spatial distribution of optical density. To study the spatial distribution of optical density, the diffuse path of near infrared light passing through human tissues was analyzed, the algorithm of tissue oxygen saturation based on approximate diffuse solution was studied, a method to detect spatial distribution of optical density was proposed and a test system was built. The results show that the spatial distribution of near infrared light density varies with different wavelengths in the arm tissues, and for 850 and 940 nm near infrared light, the linear region of spatial distribution of optical density is 20~40 mm and 20~35 mm, respectively. The distance between the light source and the detector in the sensor should be in the common linear region of the spatial distribution of light density. The results are of guiding significance for exploring the spatial distribution of optical density in tissues and designing the structure of tissue oxygen sensor.