Study and Design of the Pulse Oxygen Saturation in Blood Measuring Instrument Based on PIC MCU

氧是维护生命的基础,血氧饱和度是人体极为重要的生理参数.血氧饱和度的测量在临床和日常保健中有重大意义.系统是以PIC18C252单片机为核心控制的测量仪,在硬件上实现了使用光传感器采集红光和红外光透过动脉血管后产生的信号电路以及相关的测量电路,实现了与PC机的通信;在软件上实现了以PIC18C252单片机为核心的控制程序,实现了数字信号处理算法和计算人体脉率和血氧饱和度(SaO2)的复杂算法,有效地克服了测量信号的漂移和噪声干扰,从而满足临床生理监护的需要.Oxygen is the base for maintaining life.Oxygen saturation are the very important physiological parameters of human body.The measurement of oxygen saturation in blood has great significance in clinical and daily health care.This paper first analyses the measurement principles and methods in detail.On the basis of comparison among various related pulse oxygen saturation in blood instruments,the paper gives the overall design of pulse oxygen saturation in blood instrument based on PIC18C252 single chip microcomputer.The system is a measurement instrument that takes PIC18C252 as the core control.In hardware,it fulfils the signal circuits and the related measurement circuits by using photo-sensor to collect red light and infrared ray passing through arterial vessel,the communication with personal computer.In software,it implements the control programs that take PIC18C252 single chip microcomputer system as the core,the processing algorithms of numerical signal,and complicated algorithms of computing human's pulse rate and oxygen saturation.This system is effective in overcoming the signal excursion and the noise,so that it can satisfy the need of clinic wardship