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研究生:游生益
研究生(外文):Yu Sheng I
論文名稱:非接觸式心搏率量測系統應用於心跳變異率監測
論文名稱(外文):A Non-Contact Heart Rate Measurement System for Monitoring HRV
指導教授:黃基哲
指導教授(外文):Huang Ji Jer
學位類別:碩士
校院名稱:南台科技大學
系所名稱:電機工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:102
畢業學年度:101
語文別:中文
論文頁數:65
中文關鍵詞:心電圖、非接觸式、電容耦合電極、基線飄移
外文關鍵詞:Electrocardiogram, Non-Contact, Capacitive-Coupled Electrode
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現今,科技的快速發展,無論是心電圖、血壓或血氧濃度等生理訊號量測技術日新月異,這些技術的發展引領著人類醫學診斷技術的長足進步,而功能更強、速度更快、診斷更準確的醫療儀器產品也陸續被開發出來,用於增進人們的健康。然而當人們使用這些醫療儀器進行量測與診斷時,經常已出現疾病的徵兆,此時就得投入更多的醫療與社會人力成本。但如果在未有明顯病兆時,常到醫療院所進行疾病篩檢工作,在執行上確實困難。為了達到早期發現,早期治療,且能即時加以追蹤治療,節省社會醫療資源與提升人們的健康。本研究發展一套以非接觸式(Non-Contact)的生理量測技術,利用電容耦合電極(Capacitive-Coupled Electrode)置於椅背上,隔著椅背上覆蓋物與使用者的衣物,利用心電訊號傳至人體時,藉由人體的體表電荷變化進而與椅背上的電極相互感應而量測出心電圖訊號,使受測者穿著衣服就可以量測心電圖,本研究中也進行不同材質與不同厚度布料的測試,並選用純棉材質作為椅背上的覆蓋物,因有較高的介電常數以提高訊雜比,生理訊號量測所產生的移動雜訊將亦會影響到系統所欲擷取心電圖訊號。所以在微處理器中建構了IIR的巴特沃斯濾波器,在測試過程當量測心搏率關閉微處理器數位濾波時,可得訊雜比為29.2dB,當微處理器打開數位濾波時,其可得訊雜比達71.1dB,這能有效消除移動雜訊與基線飄移功能,以獲得穩定的心電圖訊號。此系統以初步的實現並結合居家設備的沙發上,也能在穿著薄棉質的衣服時得到非接觸式心電圖的量測訊號。並經由量得心搏率做心跳變異率的分析,儲存在後端資料庫以獲得一個有用的生理訊號指標參數(HRV),提供予使用者一個長期監測與紀錄的生理資訊。
Today, the rapid development of science and technology in the study of physiological signals has provided considerable progress leading to human medical diagnostic technology. However, when people use these medical instruments for measurement and diagnosis, more often than not there already exists a certain medical condition that would require them to spend more in terms of medical and social costs. But in the absence of obvious clinical signs, it is very difficult for medical institutions to determine if a person is suffering from an ailment or not. Hence, there is a need for early detection and early treatment of disease to save social and medical resources while enhancing the quality of life of the people. This study developed a physiological measurement technology using a Non-Contact Capacitive-Coupled Electrode placed at the backrest of a sofa and can measure the ECG of a person without removing one’s clothes. Heart electrical signals transmitted by the human body are determined by the difference in the charge of the body's surface and the electrode on their back. The present study also test different materials with different thickness of fabric and a selection of cotton material as a cover for the back of the chair. The material chosen must have a high dielectric constant in order to improve the signal to noise ratio. Movement noise also affects the acquisition of desired ECG signal, thus Butterworth filter is encoded in the microprocessor to provide digital filtering. In the event that the microprocessor is turned off the measured ECG during the test would produce a signal to noise ratio of 29.2dB. However, once the microprocessor based digital filter is turned on the SNR ratio rises to71.1dB, which can effectively eliminate the mobile noise and baseline drift and obtain a stable ECG signal. This system is initially implemented on a home sofa, while wearing pure cotton clothes to utilize the non-contact ECG measurement. Furthermore, heart rate variability analysis is calculated and stored in the back-end database to obtain a useful physiological signal indicator parameters made available to users with a long-term monitoring and recording of their physiological information.
摘要 II
ABSTRACT III
誌謝 IV
目錄 V
圖目錄 VII
表目錄 XI
第一章 緒論 1
1-1簡介 1
1-2心電圖背景與原理 3
1-3文獻回顧 7
1-4研究動機與目的 11
1-5論文架構 12
第二章 材料與方法 13
2-1電容耦合電極 13
2-2類比電路 17
2-3數位濾波 23
2-4心跳變異率 24
2-5數位電路 26
2-6人機介面 27
第三章 結果與討論 29
3-1電容耦合電極測試 29
3-2類比電路分析與量測 30
3-3數位濾波評估與實際量測 34
3-3數位濾波結果建置在韌體 41
3-4材質的比較 43
3-5系統驗證 45
3-6情境實驗 46
第四章 結論與未來展望 49
參考文獻 50
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