This paper proposes a multifunctional fitness monitor based on FFT and photoelectric sensor, which uses pulse-type and non-invasive detection method to complete the analysis of the human blood oxygen saturation and heart rate. The system col ects the absorption of red and infrared light absorbed by fingertip, then by programmable gain amplifier and the Fast Fourier analysis, it extracts the amplitude, frequency of the AC signal. PIC24FJ128GA010 is used to complete the col ection, automatic gain judgment and signal processing. Final y, the result is calibrateed by pulse blood oxygen emulator. Furthermore, it realizes the pedometer function based on three axles acceleration sensors MMA7260, which enhances fitness monitor’s usability and al ows people to obtain dynamic physiological signs when exercising.

作者：田鹤；朱欢燕；张钰；张珣

来源：中国医疗器械杂志 2013 年 1期