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首页> 外文期刊>Bangladesh Journal of Medical Physics >Development of Low Cost Miniature USB Based Data Acquisition System for Biomedical Instrumentation
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Development of Low Cost Miniature USB Based Data Acquisition System for Biomedical Instrumentation

机译:基于低成本微型USB的生物医学仪器数据采集系统的开发

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In biomedical instrumentation, computer based data acquisition system is required for recording of physiological parameters and bioelectric signals, which allows signal processing, display, analysis and storage in digital media. However, Most of the commercially available PC based Data Acquisition systems are of very high cost and requires specific commercial software, again at a very high cost. Moreover, if the data is not stored in raw binary or known format, it is not possible for the user to use the data in other system or software of their own choice. Therefore, a low cost, simple and open source PC based data acquisition system for biomedical application would be very useful for biomedical instrument developers and researchers in the low resource countries. In this work, we present such development of data acquisition system. The developed system utilizes an 8-bit ordinary low cost microcontroller and some electronic circuit component to develop the data acquisition system and implementation of USB 1.1 (Universal Serial Bus) interface to PC. The onboard 10-bit ADC of the microcontroller was used for analog data sampling. Two sampling and data transfer mode is implemented, (i) Continuous mode with low sampling rate (800 sample/sec) and practically real time plotting and (ii) Batch mode, with high sampling rate (76.9 k sample/sec) but with batch type plotting. To evaluate the system, PC side GUI (Graphical User Interface) software was also developed. The GUI of system shows that a test sinusoidal signal is reproduced very nicely without any amplitude and phase distortion within the frequency band of 1 to 10 KHz. The system is suitable for low frequency bioelectric signals like ECG, EEG etc. and as well as high frequency signal like EMG, NCV etc. The system is low cost, miniature, simple, and efficient and being used in several indigenously developed medical devices like ECG, EMG, NCV and FIM [Rabbani et al, 1999] at the authors’ department with excellent satisfactory results.
机译:在生物医学仪器中,需要基于计算机的数据采集系统来记录生理参数和生物电信号,从而允许在数字媒体中进行信号处理,显示,分析和存储。但是,大多数基于商用PC的数据采集系统成本很高,并且需要专用的商业软件,成本也很高。此外,如果数据未以原始二进制或已知格式存储,则用户无法在自己选择的其他系统或软件中使用该数据。因此,对于资源匮乏国家的生物医学仪器开发人员和研究人员而言,一种低成本,简单且开源的基于PC的生物医学数据采集系统将非常有用。在这项工作中,我们介绍了这种数据采集系统的开发。开发的系统利用8位普通的低成本微控制器和一些电子电路组件来开发数据采集系统,并实现与PC的USB 1.1(通用串行总线)接口。微控制器的板载10位ADC用于模拟数据采样。实现了两种采样和数据传输模式:(i)具有低采样率(800个样本/秒)和实际实时绘图的连续模式,以及(ii)具有高采样率(76.9 k个样本/秒)但具有批处理的批处理模式类型绘图。为了评估系统,还开发了PC侧GUI(图形用户界面)软件。系统的GUI显示,在1到10 KHz的频带内,测试正弦信号可以很好地再现,没有任何幅度和相位失真。该系统适用于低频生物电信号,如ECG,EEG等,以及高频信号,如EMG,NCV等。该系统成本低,体积小,简单,高效,可用于多种本地开发的医疗设备,例如作者部门的ECG,EMG,NCV和FIM [Rabbani等,1999]取得了令人满意的结果。

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