基于动态光谱的血氧检测系统的设计与实现

发布时间：2018-01-31 14:20

本文关键词： 脉搏血氧单片机动态光谱硬件电路　出处：《东北大学》2012年硕士论文　论文类型：学位论文

【摘要】：脉搏血氧仪是一种可连续、无创、方便地检测动脉血氧饱和度的仪器。由于其在原理上还存在着缺陷,使得它在测量的精度、稳定性方面还有待于进一步的提高和完善。因此,通过查阅国内外众多文献,本文使用了一种基于动态光谱的脉搏血氧测量原理,并以C8051F020单片机为核心实现人体血氧饱和度的无创测量方法,从而实现了提高测量结果的精度。围绕着该目标,本课题主要完成了以下工作： 1.动态光谱算法的理论推导与应用。由于传统的测量算法忽略了由人体散射效应带来的影响,因此会不可避免的引入误差,所示如果找到一种能对传统算法缺陷进行改进的算法无疑会提高测量的精度。本文经过长时间的研究和探讨,发现了由李刚教授提出的一种基于动态光谱的新型血氧算法,该算法用平均光路长代替了传统算法的几何光路长,并对算法进行了改进,可以避免个体差异以及测量条件等因素带来的影响。 2.硬件电路的设计。根据脉搏血氧饱和度测量仪的原理,设计了以C8051F02单片机为核心的脉搏血氧饱和度测量仪的硬件电路,主要包括传感器驱动电路,带通滤波电路,放大电路,电压抬升电路,双光束分离电路,液晶显示电路等。 3.软件设计。在Silicon Laboratories IDE环境下,利用C语言编程产生时序,控制光源驱动电路；实现A/D、D/A转换以及数据的存储,液晶的显示和脉搏波特征点的提取。 4.血氧仪的定标以及误差,准确性的对比以及讨论。本系统利用INDEX2型脉搏血氧仿真仪血氧仪对本系统进行定标和校验,对实验数据进行了分析,对比了动态光谱算法与传功算法结果的差异,最后确定动态光谱算法的精度和稳定性与传统算法相比提升了1%-3%。
[Abstract]:Pulse oximeter is a continuous, non-invasive, convenient instrument for measuring arterial oxygen saturation. The stability still needs to be further improved and improved. Therefore, by consulting many literatures at home and abroad, this paper uses a pulse oxygen measurement principle based on dynamic spectrum. With C8051F020 single chip microcomputer as the core, the non-invasive measurement method of human blood oxygen saturation is realized, thus the accuracy of the measurement result is improved. 1. Theoretical derivation and application of dynamic spectrum algorithm. Because the traditional measurement algorithm neglects the effect of human body scattering effect, errors will inevitably be introduced. It is shown that if we find an algorithm that can improve the defect of the traditional algorithm, it will undoubtedly improve the accuracy of measurement. This paper has been studied and discussed for a long time. A new blood oxygen algorithm based on dynamic spectrum proposed by Professor Li Gang is found. The average optical path length is used to replace the geometric optical path length of the traditional algorithm, and the algorithm is improved. Individual differences and measurement conditions can be avoided. 2. Design of hardware circuit. According to the principle of pulse oxygen saturation measuring instrument, the hardware circuit of pulse oxygen saturation measuring instrument based on single chip microcomputer C8051F02 is designed. It mainly includes sensor drive circuit, bandpass filter circuit, amplifying circuit, voltage lifting circuit, double beam separation circuit, liquid crystal display circuit and so on. 3. Software design. In the environment of Silicon Laboratories IDE, C language is used to generate time sequence and control the driving circuit of light source. The realization of A / D / D / A conversion, data storage, liquid crystal display and pulse feature point extraction. 4. Compare and discuss the calibration, error and accuracy of the oximeter. This system uses INDEX2 pulse oxygen simulator to calibrate and verify the system, and analyzes the experimental data. The difference between the dynamic spectrum algorithm and the power transfer algorithm is compared. Finally, the accuracy and stability of the dynamic spectrum algorithm are determined to improve the accuracy and stability of the dynamic spectrum algorithm compared with the traditional algorithm.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP274;R318.6

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