双通道血流容积测量系统的设计与实现

Design and Realization of Double-Channel Blood Volume Measuring System

本文介绍了双通道血流容积测量系统的设计与实现。系统包括硬件与软件两个部分。硬件部分主要功能是采用双通道直接式电路阻抗法测量生物体受检部位的基础阻抗Z0 和反应血流容积变化的ΔZ曲线;软件部分是采用定时器中断方式,利用汇编语言与C语言混合编程来控制A D板的信号实时采集。整个系统采用双通道方式,可以同时测量左右肢体的血流容积变化情况,提高了测量的准确性。

This paper introduces the design and realization of double-channels blood volume measuring system, which mainly consists of hardware and software parts. The hardware is to measure biologic basic impedance Zo and AZ that reflects the variety of blood volume by doublechannel direct circuit impedance; In software, assembly language and C language are used to control A/D to sample record and display by the timed interrupter. Because of the technology of double-channel, the system can synchronously measure the change of blood volume both of left and right arms, so it improved the accuracy of test greatly.