基于AD5933的葡萄糖水溶液阻抗分析系统  

Impedance analysis system of glucose solution based on the AD5933

作　　者：李佳宾[1] 梁俍[1] 冉康康[1] 郑茜茜[1] 陈付毅[1] 

机构地区：[1]温州医科大学生物医学工程系,浙江温州325035

出　　处：《微型机与应用》2014年第15期92-94,共3页Microcomputer & Its Applications

摘　　要：介绍了基于AD5933的阻抗检测原理和软硬件实现。系统设计采用阻抗测量芯片AD5933,以低功耗高性能处理器STC89C52单片机作为控制器。该检测仪采用AD5933中的数字频率合成器(DDS)产生激励信号,施加在待测阻抗上,ADC采集相应信号并送到片内DFT模块进行数字处理,测量结果通过I2C送至单片机,再由单片机与计算机上位机通信,计算机显示该阻抗值。该仪器能实现电阻、电容、电感阻抗快速、准确地测量,经实验验证,阻抗幅值和相位测量的相对误差较小,(电阻阻抗平均偏差为0.041 1,相位平均偏差为0.152°)。葡萄糖水溶液浓度与阻抗呈线性相关,相关系数大于0.99。Impedance detection principle based on the AD5933 and the hardware and software implementation are introduced in this paper. System design uses the AD5933 impedance measurement chip, with a low consumption of high-performance processor STC89C52 MCU as the controller. The detector adopts the AD5933 digital frequency synthesizer （DDS） in the excitation signal is produced, imposed on the impedance under test, the ADC acquisition signal and sent to the corresponding chip DFT digital processing module, measurement results through the I2C sent to the microcontroller, again by the single-chip microcomputer and PC computer communication, the computer shows that the impedance values. At the same time also can according to the relationship of impedance blood flow and blood sugar to further realize the noninvasive detection of blood sugar levels. The instrument can realize the resistor, capacitor, inductance impedance measuring rapidly and accurately, through experimental verify that resistive impedance deviation from the mean is 0.0411, phase deviation from the mean is 0.152＆#176;, aqueous solution of glucose concentration was linearly correlated with the impedance, the correlation coefficient greater than 0.99.

关 键 词：AD5933 阻抗检测 STC89C52 单片机 上位机 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]