基于FFT、光电传感器的多功能健身监测仪的研究

Research on Multifunctional Fitness Monitor Based on FFT and Photoelectric Sensor

提出一种基于FFT和光电传感器的多功能健身监测仪,采用脉搏式无创血氧饱和度检测方法来完成对人体血氧饱和度及心率的分析。系统通过采集指尖对红光及红外光的吸收量,经可控增益放大器放大,并由快速傅里叶分析(FFT)得到交流电信号的幅度、频率等。使用PIC24FJ128GA010完成信号的采集、自动增益判断、信号处理等功能,最后采用脉搏血氧仿真器来进行结果标定。此外,系统还实现了基于加速度传感器MMA7260的计步器功能,增强健身监测仪的实用性,并且能在健身过程中同时获取动态生理体征。

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 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 allows people to obtain dynamic physiological signs when exercising.