本文關(guān)鍵詞： 脈搏血氧 單片機 動態(tài)光譜 硬件電路　出處：《東北大學》2012年碩士論文　論文類型：學位論文

【摘要】：脈搏血氧儀是一種可連續(xù)、無創(chuàng)、方便地檢測動脈血氧飽和度的儀器。由于其在原理上還存在著缺陷,使得它在測量的精度、穩(wěn)定性方面還有待于進一步的提高和完善。因此,通過查閱國內(nèi)外眾多文獻,本文使用了一種基于動態(tài)光譜的脈搏血氧測量原理,并以C8051F020單片機為核心實現(xiàn)人體血氧飽和度的無創(chuàng)測量方法,從而實現(xiàn)了提高測量結(jié)果的精度。圍繞著該目標,本課題主要完成了以下工作： 1.動態(tài)光譜算法的理論推導與應用。由于傳統(tǒng)的測量算法忽略了由人體散射效應帶來的影響,因此會不可避免的引入誤差,所示如果找到一種能對傳統(tǒng)算法缺陷進行改進的算法無疑會提高測量的精度。本文經(jīng)過長時間的研究和探討,發(fā)現(xiàn)了由李剛教授提出的一種基于動態(tài)光譜的新型血氧算法,該算法用平均光路長代替了傳統(tǒng)算法的幾何光路長,并對算法進行了改進,可以避免個體差異以及測量條件等因素帶來的影響。 2.硬件電路的設(shè)計。根據(jù)脈搏血氧飽和度測量儀的原理,設(shè)計了以C8051F02單片機為核心的脈搏血氧飽和度測量儀的硬件電路,主要包括傳感器驅(qū)動電路,帶通濾波電路,放大電路,電壓抬升電路,雙光束分離電路,液晶顯示電路等。 3.軟件設(shè)計。在Silicon Laboratories IDE環(huán)境下,利用C語言編程產(chǎn)生時序,控制光源驅(qū)動電路；實現(xiàn)A/D、D/A轉(zhuǎn)換以及數(shù)據(jù)的存儲,液晶的顯示和脈搏波特征點的提取。 4.血氧儀的定標以及誤差,準確性的對比以及討論。本系統(tǒng)利用INDEX2型脈搏血氧仿真儀血氧儀對本系統(tǒng)進行定標和校驗,對實驗數(shù)據(jù)進行了分析,對比了動態(tài)光譜算法與傳功算法結(jié)果的差異,最后確定動態(tài)光譜算法的精度和穩(wěn)定性與傳統(tǒng)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.
【學位授予單位】：東北大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TP274;R318.6

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