便携式多功能生理电信号采集装置的研制

发布时间：2018-07-03 14:47

本文选题：生理电信号 + 24bitAD　；参考：《中南民族大学》2012年硕士论文

【摘要】：近年来，随着科学技术的发展，生理电信号采集装置的采集精度逐步提高，体积和功耗逐步减少，为装置实现便携化提供了条件。面对目前单台装置只能采集特定生理电信号，不能一机多用的问题，本文设计了一套便携式多功能的生理电信号采集系统，该系统具有精度高、便携性好，可采集多种生理电信号，如：脑电、心电信号等特点。本文先简单归纳了常见生理电信号的幅频特性，然后较为详细地给出了系统整体方案设计及关键元件选型的过程。其中，系统方案确定为“上、下位机”式系统结构，上下位机之间使用USB接口通讯。下位机的关键元件确定为：模拟前端芯片（ADS1298）、控制芯片（STM32）和USB隔离芯片（ADuM4160）。ADS1298为8通道、24bit模数转换芯片，内部还前置放大、右腿驱动等电路，，通过芯片转换得到的数据通过SPI总线传输至STM32；STM32控制整个下位机，得到转换数据后，通过USB接口将数据发送给上位机；上下位机之间使用ADuM4160芯片进行电气隔离，下位机采用电池供电。上位机使用NI-VISA实现USB驱动，完成数据接收；使用Labview提供的图形化编程方式实现数字滤波、放大，以及生理电信号波形显示、存储。本文参考“V模型”的测试方式，对系统样机分别进行了集成测试、系统测试和验收测试。测试结果表明，系统样机达到了设计要求，通过简单配置可分别进行脑电和心电信号的测量，其中脑电信号的噪声水平为4.3μV，心电信号的噪声水平为8.7μV。系统样机持续工作时间大于48小时，硬件电路体积仅为102×76×30（mm×mm×mm），易于便携使用。
[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),).
【学位授予单位】：中南民族大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318.6

【参考文献】