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Title:: Research on an oxygen saturation monitoring device with a in-ear sensor system

Author(s):: LI Weiquan1; ZHOU Wenguang2; 1.Xiamen Ocean Vocational College,Xiamen 361102,China;2.Medical Engineering Department, 32251 Unit,People′s Liberation Army Xiamen 361003

Keywords:: Blood oxygen saturation detection; Auditory meatus; Anti-motion interference; Least-mean-squares adaptive filter; Wearable device; Photoplethysmographic; Light guide column

摘要:: 本研究采用美信公司的MAX30102新型血氧饱和度传感器模块，研制了一款耳部血氧饱和度采集装置，以无线入耳式耳机的方式，在耳道的入耳处采集人体的血氧饱和度指标。为了提高检测过程中的信号抗干扰度，本研究设计了专用的导光柱增强检测光透光性，降低自然光的干扰，同时可以紧贴皮肤，减少运动产生的位移。数据处理方面结合耳机内置的三轴加速度传感器，采用LMS自适应滤波的方法滤除因运动位移产生的干扰信号。实验证明，该装置可以有效滤除因运动位移所产生的运动干扰。

Abstract:: We used the MAX30102 new blood oxygen saturation sensor module to develop an ear blood oxygen saturation collection device. The blood oxygen saturation index of human body was collected from the external acoustic meatus by the way of wireless earphone.In order to improve the anti-interference degree of the signal in the detection process, a special light guide column was designed to enhance the transmittance of the detection light, and reduce the interference of natural light. At the same time, it could be close to the skin to reduce the displacement caused by movement.During data processing, the interference signal caused by motion and displacement was filtered by the LMS adaptive filtering method combined with the three-axis acceleration sensor built into the earphone.The experimental results show that this device can effectively filter the motion interference caused by motion displacement.