Effect of Ambient Light on Accuracy of Pulse Oximeter
Pulse oximetry has become a standard noninvasive technique for the measurement of blood oxygen saturation level (%SpO2). Pulse oximetry employs a red led (660nm) and an infrared led (940nm), and a photo-detector which measures the absorption of red and infrared light by the pulsating blood flow and determines the oxygen saturation level. However, certain components of ambient light also excite the photo-detector, which affects the accuracy of pulse oximeter readings. This paper presents the two experiments carried out to determine the effect of ambient light on accuracy of pulse oximeter.