本文選題：生理電信號(hào) + 24bitAD��； 參考：《中南民族大學(xué)》2012年碩士論文

【摘要】：近年來，隨著科學(xué)技術(shù)的發(fā)展，生理電信號(hào)采集裝置的采集精度逐步提高，體積和功耗逐步減少，為裝置實(shí)現(xiàn)便攜化提供了條件。面對(duì)目前單臺(tái)裝置只能采集特定生理電信號(hào)，不能一機(jī)多用的問題，本文設(shè)計(jì)了一套便攜式多功能的生理電信號(hào)采集系統(tǒng)，該系統(tǒng)具有精度高、便攜性好，可采集多種生理電信號(hào)，如：腦電、心電信號(hào)等特點(diǎn)。 本文先簡(jiǎn)單歸納了常見生理電信號(hào)的幅頻特性，然后較為詳細(xì)地給出了系統(tǒng)整體方案設(shè)計(jì)及關(guān)鍵元件選型的過程。其中，系統(tǒng)方案確定為“上、下位機(jī)”式系統(tǒng)結(jié)構(gòu)，上下位機(jī)之間使用USB接口通訊。 下位機(jī)的關(guān)鍵元件確定為：模擬前端芯片（ADS1298）、控制芯片（STM32）和USB隔離芯片（ADuM4160）。ADS1298為8通道、24bit模數(shù)轉(zhuǎn)換芯片，內(nèi)部還前置放大、右腿驅(qū)動(dòng)等電路，，通過芯片轉(zhuǎn)換得到的數(shù)據(jù)通過SPI總線傳輸至STM32；STM32控制整個(gè)下位機(jī)，得到轉(zhuǎn)換數(shù)據(jù)后，通過USB接口將數(shù)據(jù)發(fā)送給上位機(jī)；上下位機(jī)之間使用ADuM4160芯片進(jìn)行電氣隔離，下位機(jī)采用電池供電。上位機(jī)使用NI-VISA實(shí)現(xiàn)USB驅(qū)動(dòng)，完成數(shù)據(jù)接收；使用Labview提供的圖形化編程方式實(shí)現(xiàn)數(shù)字濾波、放大，以及生理電信號(hào)波形顯示、存儲(chǔ)。 本文參考“V模型”的測(cè)試方式，對(duì)系統(tǒng)樣機(jī)分別進(jìn)行了集成測(cè)試、系統(tǒng)測(cè)試和驗(yàn)收測(cè)試。測(cè)試結(jié)果表明，系統(tǒng)樣機(jī)達(dá)到了設(shè)計(jì)要求，通過簡(jiǎn)單配置可分別進(jìn)行腦電和心電信號(hào)的測(cè)量，其中腦電信號(hào)的噪聲水平為4.3μV，心電信號(hào)的噪聲水平為8.7μV。系統(tǒng)樣機(jī)持續(xù)工作時(shí)間大于48小時(shí)，硬件電路體積僅為102×76×30（mm×mm×mm），易于便攜使用。
[Abstract]:In recent years, with the development of science and technology, the acquisition accuracy of physiological signal acquisition device is gradually improved, the volume and power consumption are gradually reduced, which provides the conditions for the device to achieve portability. In the face of the problem that a single device can only collect specific physiological signals and can not be used in a single machine, a portable and multifunctional physiological signal acquisition system is designed in this paper. The system has high precision and portability. Can collect a variety of physiological electrical signals, such as: EEG, ECG and other characteristics. In this paper, the amplitude-frequency characteristics of common physiological signals are summarized, and then the design of the whole system and the selection of key components are given in detail. The system scheme is defined as "upper, lower computer" type system structure, and USB interface communication is used between upper and lower computers. The key components of the lower computer are as follows: analog front-end chip (ADS1298), control chip (STM32) and USB isolation chip (ADuM4160) .ADS1298 are 8-channel 24bit A / D conversion chips, with internal preamplifier, right leg drive, etc. The data obtained by chip conversion is transmitted to STM32NSTM32 through SPI bus to control the whole lower computer. After obtaining the converted data, the data is sent to the host computer through USB interface, and the ADuM4160 chip is used between the upper and lower computers for electrical isolation. The lower computer is powered by batteries. The upper computer uses NI-VISA to realize USB driver to complete data receiving, and LabVIEW provides graphical programming method to realize digital filtering, amplification, display and storage of physiological signal waveform. In this paper, the system prototype is tested by integration test, system test and acceptance test with reference to "V model" test method. The test results show that the system can meet the design requirements. The EEG and ECG signals can be measured by simple configuration. The noise level of EEG is 4.3 渭 V and the noise level of ECG is 8.7 渭 V. The working time of the prototype is longer than 48 hours and the volume of the hardware circuit is only 102 脳 76 脳 30 (mm 脳 mm),).
【學(xué)位授予單位】：中南民族大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：R318.6

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