反射式血氧含量检测器

文档编号:JD1196  文档字数:11927

摘要
 本课题是人体脉搏测量仪的设计。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。系统要在小于十秒的时间内，测量出人体一分钟的脉搏，并且保证误差在2次以内。本系统以89S51单片机作为中心，通过使用单片机来实现系统最核心的计算脉搏功能。在信号的前端处理上，使用压电陶瓷片采集人体脉搏信号，然后经过AD620放大，施密特触发器整形，低通滤波器滤波等一系列操作，将脉搏信号转换为同频率的脉冲信号输入到单片机内，并利用单片机对其进行计数。
 采用透射式检测方法确定人体血液中的氧饱和度已经是较为成熟的监护手段，在临床和家庭保健场合有广泛的应用，但在很多需要进行反射检测的场合，如脑血氧、肌血氧、胎儿血氧临护等，如何用无创伤、经济的方法获得准确、可靠的血氧饱和度值仍是生物医学工程领域不断在探索的问题。本文在深入研究透射式血氧饱和度测定原理及其方法之后，得出反射式血氧饱和度的检测原理和方法。
 关键词: 血氧饱和度 透射式 反射式
 
Abtract
 This topic is human pulse measuring instrument design. As the particularity of the pulse signal, care must be taken in the design to achieve accurate measurements. The focus of the system lies in the simplicity of measurements required to achieve and precise. System should be less than ten seconds, the measured one minute pulse of the human body, and more than two times to ensure error. This system 89S51 microcontroller as the center of the system by using a single chip to achieve the pulse of the core computing functions. Front-end processing of the signal, the use of piezoelectric ceramic body acquisition pulse signal is then amplified through the AD620, Schmitt trigger shaping, low-pass filter and a series of operation, the pulse signal is converted to a pulse signal with the input frequency to the microcontroller, the microcontroller and use them count.
 Employing a transmissive detection methods to determine human blood oxygen saturation is already more mature guardianship means, in the clinical and home care settings with a wide range of applications, but many need to be reflected in the detection of the occasion, such as brain oxygen, muscle oxygen , fetal oxygen and other clinical care, how to use non-invasive, economical method to obtain accurate and reliable oxygen saturation values ​​remain constantly in the field of biomedical engineering to explore the issue.
Keywords: oxygen saturation transmissive reflective
 
 目录
摘要 1
Abtract 2
1 绪论 4
1.1 血氧饱合度测量的发展状况 4
1.4 本课题的目标及主要工作 7
2 无创脉搏血氧饱和度测量的原理与方法 8
2．1 透射式无创血氧饱和度测量的原理 8
2.1.1 朗伯—比耳定律 10
3 反射式血氧饱和度检测的硬件系统设计 12
3．1 总体设计 12
3.2.硬件系统模块框 13
3.2.1 13
3.2.2 探头驱动模块 14
3.2.3 初级放大电路模块 17
3.2.4.低通滤波电路. 18
3.2.5 隔直放大模块 19
3.2.6 信号的 A/D 采样 20
3.2.7 电源管理模块 22
3.2.8 串口通讯电路设计 23
3.2.9 液晶显示电路模块 24
3.3 硬件电路设计小结 26
4 Proteus7.0对硬件电路仿真结果和仪器定标 27
4.1 Proteus7.0 软件概述 27
5.2 硬件电路仿真输出波形 29
5.3 定标曲线 30
小结 32
总结 33
致谢 34
参考文献 35

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