%0 Journal Article
%T STUDY ON A DATA ACQUISITION SYSTEM FOR BIO-ELECTRICAL IMPEDANCE PARAMETERS MEASUREMENT<br>生物电阻抗特征参数测量数据采集系统的研究
%A DONG Xiu-zhen
%A SHI Xue-tao
%A QIN Ming-xin
%A YOU Fu-sheng
%A TANG Meng-xing
%A LIU Rui-gang
%A FU Feng
%A WU Xiao-ming
%A <br>董秀珍
%A 史学涛
%A 秦明新
%A 尤富生
%A 汤孟兴
%A 刘锐岗
%A 付峰
%A 吴小明
%J 生物物理学报
%D 2001
%I 
%X In order to establish electrical impedance parameter tomography (EIPT),we have accomplished a rapid, precise acquisition system for bio-electrical impedance characteristic parameters measurement, and the sweeping frequency technique combined with mixing frequency technique, which can collect impedance information at different frequencies simultaneously, was employed. Also, a new demodulation method, named by us as “orthogonal sequential digital demodulation”, was chosen to improve system precision. The results showed that this system could select frequencies from 1.6kHz to 380kHz with a minimum frequency interval between any two frequencies less than 100Hz. It could collect impedance information at four different frequencies at the same time. The noise level of the signal source was about -80DB. And if 64 points per period was sampled, the signal to noise ratio could be improved by more then 5.6 times by demodulate algorithm.
%K Bio-electrical impedance parameter tomography
%K Digital demodulation
%K Data acquisition<br>生物电阻抗参数成像
%K 数字解调
%K 数据采集系统
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=E0C9D9BBED813D6674AC13E942EAC86D&aid=039DCA6CD72DC6E3&yid=14E7EF987E4155E6&vid=BCA2697F357F2001&iid=E158A972A605785F&sid=89FA2FA9891FF61E&eid=FE6645F2371CA43C&journal_id=1000-6737&journal_name=生物物理学报&referenced_num=3&reference_num=6