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• W2050491764 abstract "This paper proposes a method to recover the pulse signal with the theory of lock-in amplifier and calculates the oxygen saturation. The pulse signal is obtained based on the method of Photoplethysmography (PPG). We use a LED as the light source and a photoelectric diode as the receiver to get a measured pulse wave. Because the pulse wave obtained by this method is easily disturbed by motion artifact, we use an electrocardiogram (ECG) signal to aid PPG measurement. Firstly, the ECG signal is processed by the Fast Fourier Transform (FFT) and get the heart rate. Secondly, with the value of heart rate, a typical noise free pulse waveform can be constructed. Finally, we use it as a reference input to get a recovered pulse wave by the theory of lock-in amplifier. Thus, the value of oxygen saturation can be calculated accurately through two recovered pulse waveforms of red (660nm) and infrared (940nm) light. Some volunteers were tested. The correlation coefficient between the experimental data and the data provided by a reference instrument is 0.98, proving that this method has high reliability and utility in motion." @default.
• W2050491764 created "2016-06-24" @default.
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• W2050491764 date "2014-09-19" @default.
• W2050491764 modified "2023-09-26" @default.
• W2050491764 title "Oxygen saturation detection aided with the theory of lock-in amplifier" @default.
• W2050491764 cites W2024811422 @default.
• W2050491764 cites W2034569812 @default.
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• W2050491764 doi "https://doi.org/10.1117/12.2059755" @default.
• W2050491764 hasPublicationYear "2014" @default.
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