【毕业设计】论文-便携式脉搏测试仪的设计.doc

包含仿真原理图，需要请联系qq毕 业 设 计 题目： 便携式脉搏测试仪的设计 学 生： 张 波 学 号： 20110311114 专 业： 电子信息工程 指导教师： 陈晓莉 陕西科技大学职业教育师范学院 2015年06月02日 便携式脉搏测试仪的 摘 要 脉搏波所呈现出来的形态、强度、速率和节律等方面的综合信息，能反映出人体心血管系统中许多生理疾病的血流特征。根据人体脉搏信号特征，本设计是一种基于单片机的脉搏测量系统。由于脉搏信号的特殊性，在设计时必须要注意实现测量的准确。该系统的重点就在于要求实现测量的简便化和精确化。系统要求能够实时测量和显示脉搏频率,能够实时显示脉搏信号的波形图。本系统以AT89S52单片机作为核心，通过使用单片机来实现系统最核心的计算脉搏功能。首先，使用压电传感器去采集人体脉搏信号，将采集到的信号通过低通滤波与放大电路对脉搏信号进行处理，然后，将放大后的脉搏信号通过整形电路进行电压基准变化，再经过一次放大电路对整形后的脉搏信号进行放大，将信号转换为AT89S52单片机易于处理的脉冲信号。通过单片机编程对脉冲信号进行处理，测量出一分钟内的脉搏次数，最终在液晶屏中直观地显示出来。计数的方法是利用单片机的计时器，当所测得的脉搏次数小于60或大于120时，系统会进行报警。 关键词：压电传感器，脉搏测量，单片机，液晶显示  Design of portable?pulse tester Abstract The shape,intensity,speed,and rhythm of pulse signals reflect the physical and pathological characters of heart-blood system in human bodies mostly.According to the characteristics of the human pulse signals,a pulse fluctuation frequency measurement system is designed.Because of the particularity of the pulse signal,in the design should pay attention to the realization of the accurate measurement.The key of the system is required to achieve a simple and accurate measurement.The system requirements to real-time measurement and display of pulse frequency,can display the wave form of pulse signal.This system uses the AT89S52 MCU as the center,through the use of SCM to achieve the core function of the pulse system calculation.First, using the pressure sensor to collect the pulse signal of human body,the collected signal through low-pass filtering and amplifying circuit for pulse signal processing.Then,the amplified pulse signal by a shaping circuit were voltage reference changes,then through an amplifying circuit to amplify the pulse signal after shaping,signal conversion chip AT89S52 tractable pulse signal.The pulse signal processing through MCU programming measured within a minute of the pulse of the times, culminating in the LCD screen to display.When the measured pulse rate is less than 60 or