基于手机耳机口的便携式血氧含量检测仪

A portable oxygen monitor based on smartphone audio interface

血氧含量是心血管健康领域重要的生理指标.文中提出一种基于智能手机耳机口通信的便携式血氧含量检测仪.该血氧仪基于MSP430单片机设计前端传感器,并以智能手机为载体,通过其应用软件读取数据.耳机口不仅实现对前端传感器的触发,还通过曼彻斯特编码(Manchester Encoding)完成数据的传输.不仅如此,对这些数据用基于Hamming窗的有限长单位冲激响应滤波器(Finite Impulse Response,FIR)算法进行低通滤波.处理后的信息通过手机显示,并上传至数据云端.与传统血氧仪相比,该设计具有低功耗、高精度和便携等优势,市场前景广阔.

Oxygen saturation level is one of the most important physiological indicators in the field of cardiovascular health. In this paper,a new portable oxygen monitor is proposed which is based on smart phone audio interface. This portable oxygen monitor designs s the front-end sensor based on MSP430 MCU and reads the data using application software which is smart phone-based. Among them,the smart phone audio interface can not only trigger the front-end sensor,but also transferred the pulse and oxygen data from front-end circuit based on Manchester encoding. Moreover,these data are filtered by Finite Impulse Response（ FIR） low-pass filter,which is based on Hamming window. Then the processed data are displayed via smart phone. Additionally,they are uploaded to the cloud for further analysis. The portable oxygen monitor has a better capability of accuracy and lower power consumption than traditional ones,and the market is promising.