中文摘要：

脉搏血氧饱和度检测仪可以无损、实时地检测动脉血液中的含氧百分比,从而快速对人体的呼吸状况以及心肺功能作出判断,但其检测精度极易受到测试部位运动的影响。人体测试部位的运动大致可以分为突发性运动干扰以及周期性的运动干扰。突发性干扰表现在局部脉搏波的波形突变上,而周期性的干扰体现在多个局部脉搏波的波形的周期性变化上。文章有针对性地提出了一种将微分阈值分段与迭带中值滤波相结合的方法来剔除突发扰动的方法,并且在上诉方法上再加上一级多点移动平滑以消除周期性运动干扰。实验证明该方法在消除多种运动伪差上有着较好的效果,且该方法计算简单,易于实现,有着一定的实际应用价值。

英文摘要：

The authors proposed a method which combined the differential threshold segment with median filter to eliminate abrupt artifact motion interference in the use of pulse oximeter,and further more,by adding the window moving average filter,this method could reduce the periodic artifact motion interrupt in some way. In the experiment,the authors intently simulated the common finger motion to get the artifact motion ＂corrupted＂ signal with our self-made reflectance oximeter system. The comparison of the original PPG signal and processed PPG signal shows that the method we proposed performed well in an effort to reduce the common artifact motion interrupt. Finally,in order to figure out what effort this method can make for the accuracy of oxygen saturation measurement,the ration of AC and DC component in the red and infrared signal directly associated with the pulse oxygen saturation was calculated. The result indicates that this method can reduce the error caused by the artifact motion and stabilize the rate of false reading of pulse oximeter under the finger motion state. More importantly,this method needs only a small calculation cost,so it could be applied in the real-time PPG signal processing without the need of powerful hardware.