现代电子技术2016，Vol.39Issue(7)：130-133,137,5.DOI:10.16652/j.issn.1004-373x.2016.07.032
三电极差分电容式PCB用于通道内流体空隙率检测
Three electrode differential capacitance PCB applied to fluid void ratio detection in channel
摘要
Abstract
To solve the fluid void ratio detection problem in airtight channel,such as blood vessel an d oil pipeline,a three electrode differential capacitance detection method is proposed. The method was designed and realized based on capacitor printed circuit board (PCB). When the air bubbles and other voids exist in the airtight channel,the capacitance of the sensor will change. Based on this principle,the differential capacitor amplifier,phase locked amplifier,filter and a data acquisition card are used to monitor the capacitance changes,the copper structure from top to bottom of the PCB surface is selected as the elec⁃trode,and the plastic tube is laid vertical to PCB surface through the capacitance sensor. Since the fluid′s void volume can ef⁃fect on the output voltage,the bubbles inside the liquid can be detected according to the signal imbalance between the three electrode potential voltage. The detected capacitance change signal is processed and calculated on computer to obtain the data of void volume and velocity. This fluid sensor can be used for void ratio detection in medical facilities.关键词
差分电容放大器/锁相放大器/滤波器/印刷电路板/空隙率检测/三电极Key words
differential capacitance amplifier/phase locked amplifier/filter/PCB/void ratio detection/three electrode分类
信息技术与安全科学引用本文复制引用
朱伟民,佟仕忠..三电极差分电容式PCB用于通道内流体空隙率检测[J].现代电子技术,2016,39(7):130-133,137,5.基金项目
国家自然科学基金项目 （）
