数字式人体脉搏仪的设计

电子机电论文编号:JD506 论文字数:14832,页数:39

目录
摘要 I
Abstract II
目录 III
前言 1
1脉搏检测技术 4
1.1 脉冲采样、放大、整形 4
1.2  脉搏波理论概述 4
1.2.1 光电式脉搏传感器的原理和结构 6
1.2.2 压电陶瓷脉搏传感器的原理和结构 9
1.3 脉搏检测方法 9
1.3.1 压电陶瓷脉搏检测法 10
1.3.2 脉搏的红外光学检测法 11
2 原理设计方案 13
2.1 设计任务与要求 13
2.2 原理方案框图 13
3 单元电路设计 15
3.1 脉冲检测与整形电路 15
3.2 锁相环100倍频器电路 16
3.2.1 锁相环100倍频器原理 16
3.2.2 锁相环CD4046内部框图及引脚功能 17
3.2.3  CD4518引脚及特点 20
3.2.4 锁相环100倍频器 22
3.3 计数/显示电路 23
3.3.1 闸控消隐脉冲形成电路 23
3.3.2 计数/显示电路 25
3.4 总电路图 29
结论 32
致谢 33
参考文献 34

摘要

传统的人体脉搏测量是用1分钟计数来表示，结果时间长，影响准确度。若采用两次脉搏数则更迅速直观、观察方便、成本底、体积小，不用等待1分钟的时间就可以得到真实的人体脉搏数。
本设计采用锁相环100倍频方案，将人体脉搏跳动次数通过脉搏传感器采样、放大、整形成标准方波。因方波是由直流分量+基波分量+高次谐波分量组成，将锁相环的压控振荡器频率锁顶在输入方波的某高次谐波分量的频率上来实现100倍分频。从而实现通过两次人体脉搏数的读取就可以推导到1分钟的人体的真实脉搏数。
并采用三位动态扫描计数/显示，非常迅速直观、简单实用，并采用集成化电路设计，功耗底、抗干扰能力强，可开发成商品。

关键词：脉搏数  锁相环100倍频  计数/显示

Abstract
This paper describes the design of digital type pulsimeter for the body. With the development of modern science and technology, testing demand has been becoming higher and higher. The traditional human body pulsimeter takes one minute to test .As a result; it wastes the time of testing and affects the accuracy. In order to improve the technology of testing, this paper offers an effective method.
This design is based on the angle designed in digitization and describes the principle of the pulsimeter. It consists of the phase-locked loop 100 frequency multiplication .Thus it realizes that we can demonstrate body’s true pulse number in 1 minute by reading 2 times human body pulses signal number. So this instrument testing reduces the time of testing. As well, the design which uses three dynamic scanning to count/display makes it very convenient for the user to read the pulse number. And it improves the   accuracy.  The design also uses the integrated circuit design leading to the lower spend, lower power loss, and strong antijamming ability. So it is suitable for such fields as the hospital and stadium est. So it has high commoditized value.

Keywords: Pulse number, Phased-locked loop 100 frequency multiplication, Count/display.