虚拟仪器与电容实现水膜的自动测量与控制  

Virtual Instrument and Capacitor Applied in the Online Measurement and Control of Water Film

作　　者：杨燕罡[1] 王仲[1] 宋丽梅[1] 曲兴华[1] 叶声华[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《计算机测量与控制》2005年第1期14-17,共4页Computer Measurement &Control

摘　　要：为了有效地在线测量水膜,本文采用低成本的非接触式、高精度电容测微仪作为水膜厚度的传感器件,采用虚拟仪器进行测量状态的分析,并根据测量结果给出控制信号。电容测微仪将水膜厚度变化信息转换为-10-+10V的电压变化,通过A／D采集卡(如ZTIC8310,ZTIC6319等)进入计算机系统,虚拟仪器将实时采集的水膜电压信息转换为水膜的绝对厚度值,并实时显示和保存,以供更深一步的分析。本测控系统准确地测出运动水膜的厚度信息,精度为0.01μ,解决了水膜测量的难题。采用高精度电容测微仪及虚拟仪器进行测量,方法成本低,使用方便,容易扩展到其他测控领域。In order to effectively measure the thickness of water film online, a low-cost and high precision non-contact measurement method-capacitive sensor is used as the sensor; virtual instrument is used to analyze the measurement state. Capacitive micrometer converts the change of distance to the change of voltage, its range is from -10 -+10V. And this voltage output signal can be connected to a PC through an analog to digital (A/D) interface card, such as ZTIC8310, ZTIC6319, and so on. These voltages will be computed by formulas in Labview and the real time data of thickness will be plotted on the screen. These data of thickness can be stored in computer with some format for future research. This system got the thickness of moving film, and the precision is 0.01 μ,. The difficulty of water film measure ment is tackled. The method of the measurement of water film can save a lot of fees of research and applications, and be easy to apply in other measurement and control fields.

关 键 词：虚拟仪器 电容 水膜 自动测量 自动控制 电容测微仪 电容传感器 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]