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基于LabVIEW的脉搏检测系统设计.doc
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基于LabVIEW的脉搏检测系统设计.doc
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基于 LabVIEW 的脉搏检测系统设计
摘要
本课题以 STC15 单片机作为控制系统核心的心率测量仪的设计,先采用红外对
管采集脉搏的信号,然后将 LM328 当做运放设计调理电路而处理所采集的信号,在
其处理之后,将其送至单片机实施 A/D 采样与算法处理,其后在液晶屏上显示出脉
率与脉搏波形。此外,应用 LabVIEW 进行上位机的设计而取得和 MCU 之间的通信。
基本实现了对人体脉搏的测量,以及对脉搏波形的实时监控。此次脉率测量的设计
方式较为简捷,并且具有精准的测试结果与整齐大方的显示界面,因此其发展前景
是光明的。
关 键 词 : 脉 搏 检 测 系 统 , STC15W408AS , 红 外 光 电 传 感 器 , 串 口 ,
LabVIEW
Design of pulse rate detection system
Based on LabVIEW
Measurement and Control Technology and Instrument,Measuring 2014 class Wei Cai Lian
Supervisor GanYong-jing
Abstract
This topic to STC15 single-chip microcomputer as core control system of the heart
rate meter design, by using infrared tube to pulse signal, the amplification filter circuit for
filter and amplification processing, the pulse signals using LM328 as op-amp design
control circuit to realize the collection of signal processing, the processing of signal into
the MCU A/D sampling and processing algorithm, the final realization of pulse waveform
on the LCD panel and pulse frequency display. In addition, LabVIEW is used to design the
upper machine to communicate with MCU. The measurement of human pulse and the real-
time monitoring of pulse waveform are realized. The design measuring pulse rate method
is simple, the test result is accurate, the display interface is friendly, has the relatively good
development prospect.
Keywords:Pulse detection system, STC15W408AS,infrared emission receiving
sensor, serial port, LabVIEW
目录
摘要.....................................................................................................................................................1
1 引言..................................................................................................................................................1
1.1 脉搏的研究背景...............................................................................................1
1.2 选题意义...........................................................................................................1
2 系统设计方案..................................................................................................................................1
2.1 实现的要求和功能...........................................................................................1
2.2 采集主控芯片方案...........................................................................................2
2.3 脉搏传感器的选择...........................................................................................2
2.4 上位机实现方案...............................................................................................4
3 硬件电路设计..................................................................................................................................4
3.1 系统总框架.......................................................................................................4
3.2 单片机模块.......................................................................................................5
3.2.1 主芯片 STC15W408AS 介绍....................................................................................5
3.2.2 单片机最小系统模块................................................................................................6
3.2.3 电源电路....................................................................................................................6
3.2.4 复位电路....................................................................................................................7
3.3 脉搏信号的采集...........................................................................................................8
.................................................................................................................................9
3.4 脉搏信号的处理...............................................................................................9
3.4.1 低通滤波放大电路....................................................................................................9
3.4.2 电压比较器..............................................................................................................10
3.4.3 运算放大器 LM358.................................................................................................11
3.5 液晶显示模块.................................................................................................12
3.6 USB 串口通信模块........................................................................................13
4 系统软件设计...............................................................................................................................13
4.1 测量计算原理.................................................................................................13
4.2 主程序流程介绍.............................................................................................13
4.3 显示程序流程.................................................................................................14
4.4 ADC 采用程序流程介绍................................................................................15
4.5 LabVIEW 上位机程序设计...........................................................................16
4.5.1 LaBVTEW 串口通信配置...........................................................................17
4.5.2 LabVIEW 脉搏波形显示以及脉率计算....................................................18
5 系统测试与结果分析....................................................................................................................20
5.1 测试方法和仪器.............................................................................................20
8 误差分析与修正............................................................................................................................23
总结...................................................................................................................................................24
...........................................................................................................................................................24
致谢...................................................................................................................................................25
参考文献...........................................................................................................................................26
附录...................................................................................................................................................27
附录 A 硬件原理图..............................................................................................27
附录 B PCB 图......................................................................................................29
附录 C 硬件外观图..............................................................................................30
附录 D LabVIEW 程序及前面板:.....................................................................31
附录 F 部分程序...................................................................................................32
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