| 摘要 |
PURPOSE: A method and system for measuring oxygen saturation are provided to calculate a component ratio of RED(red light) and IR(infrared light) using frequency analysis results by performing FFT(Fast Fourier transform). CONSTITUTION: IR and RED light are irradiated on a specific site of a body(S10). The IR and RED light penetrating the specific site of the body are transformed to an electric signal(S20). Each of IR and RED signals is processed by FFT(S100). A fundamental frequency component of a PPG(photoplethysmographic) signal except for a movement noise frequency component and a corresponding harmonic component are detected from FFT results(S200). A component ratio of the IR and the RED is calculated from the detected fundamental frequency component and the corresponding harmonic component(S300). [Reference numerals] (S10) Step of irradiating IR, RED light on a specific site of a body; (S100) Step of FFT of IR, RED signals; (S20) Step of receiving the IR, RED light penetrating the specific site of the body and transforming to an electric signal; (S200) Step of detecting PPG signal among FFT results except for a movement noise frequency component and a corresponding harmonic component; (S300) Step of calculating IR and RED components ratio from the fundamental frequency component detected at S200 and the corresponding harmonic component
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