Light absorption in oxygenated and deoxygenated blood varies appreciably over the visible and near‐infrared spectrum. Pulse oximeters use two distinct wavelengths of light to measure oxygen saturation SpO₂ of blood. Currently, light‐emitting diodes (LEDs) are used in oximeters, which need additional components to drive them and negatively impact the overall size of the sensor. In this work, an ambient light oximeter (ALO) is demonstrated, which can measure photoplethysmography signals and SpO₂ using various kinds of ambient light, avoiding the use of LEDs. Spectral filters are combined with organic photodiodes to create the ALO with sensitivity peaks at green (525 nm), red (610 nm), and near‐infrared (740 nm) wavelengths. Finally, the wearable ALO is used to measure photoplethysmography signals and SpO₂ on the index finger in different indoor and outdoor lighting conditions and the measurements are validated with commercial pulse oximeters under normal and ischemic conditions.

中文翻译：

---

在环境光下使用有机光电进行脉搏血氧饱和度测定

含氧和不含氧的血液中的光吸收在可见光谱和近红外光谱上有明显变化。脉搏血氧仪使用两种不同的光波长来测量血液的氧饱和度SpO ₂。当前，在血氧仪中使用发光二极管（LED），需要额外的组件来驱动它们并负面影响传感器的整体尺寸。在这项工作中，演示了一种环境光血氧仪（ALO），它可以测量光电容积描记信号和SpO ₂使用各种环境光，避免使用LED。将光谱滤光片与有机光电二极管组合在一起，可以创建出在绿色（525 nm），红色（610 nm）和近红外（740 nm）波长处具有敏感度峰值的ALO。最后，可穿戴式ALO用于在不同的室内和室外照明条件下测量食指的光电容积描记信号和SpO ₂，并且在正常和缺血条件下使用商用脉搏血氧仪对测量结果进行了验证。