用于微小距离的阻抗检测的高精度升降装置研制  

High precision lifting device for impedance detection at small distances

作　　者：侯振中 刘子悦 李文慧 蒋松怿 赵博 刘玉明 游国鹏 周宇[1] HOU Zhen-zhong;LIU Zi-yue;LI Wenhui;JIANG Song-yi;ZHAO Bo;LIU Yu-ming;YOU Guo-peng;ZHOU Yu(School of Health Sciences and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;The Second People’s Hospital of Tibet Autonomous Region,Lhasa 850000,China)

机构地区：[1]上海理工大学健康科学与工程学院,海200093 [2]西藏自治区第二人民医院,西藏拉萨850000

出　　处：《生物医学工程与临床》2022年第4期420-426,共7页Biomedical Engineering and Clinical Medicine

摘　　要：目的 为了给医用等离子体设备提供不同微小距离下进行离体组织电离实验的平台,研制了一款基于阻抗检测的高精度升降装置。方法 设计一款微小距离控制的系统,系统包括电源模块、主控模块、阻抗检测模块、升降模块和人机交互模块等及距离控制算法。装置的主控模块根据实时检测装置上微针针尖与背极板之间的阻抗变化来控制伺服电机的运动状态,实现针尖位置的精准控制。结果 经各项功能性验证实验,该系统达到0.1 mm±7%的距离控制和实时检测50 kHz下1 kΩ~1 MΩ的阻抗变化。结论 升降装置可以根据不同的实验材料动态保持准确的微小间距,满足微小距离下电离实验需求。Objective To develope a high-precision lifting device based on impedance detection for providing a platform to conduct ionization experiments of in vitro trssue at different micro-distances in medical plasma equipment. Methods A microdistance control system was designed. The system included power module, control module, impedance measurement module,lifting module, human-computer interaction module and distance control algorithm. The main control module of device controlled motion state of servo motor according to impedance changes of microneedle tip and back plate of device on real-time,which realized precise control of tip position. Results The system achieved 0.1 mm ± 7 % distance control and real-time detection of 50 kHz AC/DC 1 kΩ-1 MΩ impedance change after various functional verification experiments. Conclusion It is demonstrated that the lifting device dynamically and accurately maintain small distance according to different experimental materials, which meets the requirements of ionization experiments at micro distance.

关 键 词：距离控制 阻抗检测 AD5933 自动化 马铃薯 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置] TH77[自动化与计算机技术—控制科学与工程]