title: [Research on multifunctional fitness monitor based on FFT and photoelectric sensor].
abstract: 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 collects 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 collection, automatic gain judgment and signal processing. Finally, the result is calibrated 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 allows people to obtain dynamic physiological signs when exercising.
authors.affiliation: Electrical and Electronic National Experimental Teaching Center, Hangzhou Dianzi University, Hangzhou, 310018. tianheaurora@sina.com
authors.forename: He
authors.initials: H
authors.lastname: Tian
authors.forename: Huanyan
authors.initials: H
authors.lastname: Zhu
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xu
authors.initials: X
authors.lastname: Zhang
mesh_terms: D004867:Equipment Design; D005583:Fourier Analysis; D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D010092:Oximetry / Q000295:instrumentation / Q000379:methods*