【摘要】 为获得同一时刻、不同频率下的生物阻抗信息,设计了基于虚拟仪器的混频生物阻抗测量系统.该系统硬件平台由自主开发的信号源模块和信号调理模块以及NI公司的PCI-6111板卡组成.对混频激励下阻抗信息的提取方法进行了研究,提出了基于虚参考点的数据采集方法,利用LabVIEW实现数据的采集、分析处理、显示和存储等,大大提高了开发效率.通过与Agilent4294A阻抗分析仪进行比对,证明该系统具有较高的测量精度和准确性.更多还原

【Abstract】 A mixed frequency bioelectrical impedance measuring system based on the virtual instrument is suggested,in order to collect the bioelectrical impedance information in different frequencies,concurrently.Hardware platform of the system is composed of the signal source module,the signal conditioner and PCI-6111 card supplied by NI.Research on information extraction in the mixed frequency excitation mode and impedance measurement based on a virtual reference point is presented.Using LabVIEW,functions concerning the collection,analysis,display and recording can be implemented,which greatly improves the efficiency in development. Experimental tests in comparison with the Agilent4294A impedance analyzer showed that the precision and accuracy in detection of the system are excellent.更多还原