摘要
介绍一种以AT89C2051为控制核心的智能人体心率检测装置的设计方法。利用光电传感器采集人体脉搏信号,经过前置级放大、滤波、积分比较等信号处理电路,将其转换成脉冲电压信号,再利用单片机对脉冲信号进行处理计算出心率并显示。由于传感器信号十分微弱,其幅度一般在微伏到毫伏的数量级范围,且夹杂着各种噪声和干扰,因此要求前置级放大电路具有高增益、高共模抑制比等技术指标。实验结果表明,系统硬件、软件设计方案合理,实现了微小信号放大、显示及报警功能。具有测量灵敏度高、实时性好、性价比高等优点。
The design method of intelligent heart- rate measuring instrument based on AT89C2051 is introduced. The pulse is collected by photoelectric- sensor, and it is converted into pulse voltage signal through the signal processing circuits of pre- amplifying, LPF, integral comparator and so on, then the pulse voltage signal inputs the single chip microcomputer which can calculate heart - rate and display. The sensor signal is so weakly that its amplitude in the range of micro -voltage to MV, and includs all kinds of noise and interference, therefore the pre- amplifier must has high- gain, high common- mode rejection ratio, and other technical parameters. Experimental results show that the system scheme and hardware/software is rational, and it has such functions as small signal amplification,real- time display and alarm. Also has the advantages of high sensitivity of measure,real- time,high performance- cost and so on
出处
《现代电子技术》
2009年第2期164-166,共3页
Modern Electronics Technique
关键词
心率
光电转换
前置级放大
噪声分析
heart - rate
photo electricity transformation
pre - amplify
noise analysis
