›› 2013, Vol. 26 ›› Issue (2): 32-.

• 论文 • 上一篇    下一篇

基于虚拟仪器的高精度压力信号放大系统设计

刘魁方,黄民,姚小敏   

  1. (北京信息科技大学 机电工程学院,北京 100192)
  • 出版日期:2013-02-15 发布日期:2013-06-20
  • 作者简介:刘魁方(1986—),男,硕士研究生。研究方向:虚拟仪器和超声波检测。E-mail:liukuifang@163.com

Design of High Precision Pressure Signal Amplifier Circuit Based on LabVIEW

LIU Kuifang,HUANG Min,YAO Xiaomin   

  1. (Mechanical and Electrical Engineering Institute,Beijing Information Science and Technology University,Beijing 100192,China)
  • Online:2013-02-15 Published:2013-06-20

摘要:

微弱信号的放大要求高、难度大,涉及信号放大以及信号放大的稳定性及精密度要求。差动放大技术由于具有抑制共模信号而仅放大差模信号、增益高的特点,被应用于小信号放大技术中。系统设计采用具有差分放大功能的AD620芯片,放大了应变式传感器的微弱电压信号,以实现系统高精度的要求。采用虚拟仪器技术对放大后的信号进行采集和分析处理,并编写相应的显示界面。用二阶插值法对测量数据进行分析,验证了电路的精确性。

关键词: AD620, 二阶插值, LabVIEW, 测力传感器

Abstract:

The amplification of small signal is very difficult and demanding for signal amplification and its stability and precision.The differential amplification technology is applied to the amplification of small signal because it has the characteristics of inhibiting common mode signal and amplifying only differential mode signal and the high gain.To meet the demand of high precision in system,the AD620 chip with differential amplification is employed in system design.The virtual instrument technology is used to collect and analyze the amplified signals and to program the display interface.Second order interpolation is adopted to analyze the measuring data,which validates the circuit precision.

Key words: AD620;second order interpolation;LabVIEW;force transducer

中图分类号: 

  • TN212