基于变频振荡法的物位测量仪设计  

Design of Level Measurement Based on Variable Frequency Oscillation Method

作　　者：刘虎[1] 赵建洋[1] 

机构地区：[1]淮阴工学院计算机工程学院,江苏淮安223001

出　　处：《仪表技术与传感器》2014年第11期53-55,共3页Instrument Technique and Sensor

基　　金：江苏省科技支撑项目(BE2012112);江苏省教育厅产业化推进项目(JHB2012-58)

摘　　要：文中研究了变频振荡法工作原理,分析振荡频率与谐振电容容量成非线性反比关系。设计了一种基于变频振荡法的物位测量仪,采用电容三点式改进型克莱泼振荡器测量电路,振荡频率经256分频、整形后送入微控制器测量频率,通过频率变化计算电容变化量,然后计算罐体物位高度。经验证,该方法测量精度较高,输出信号稳定,仪表达到0.5级精度设计要求。This paper discussed the working principle of variable frequency oscillation method, and analyzed the oscillation frequency was inversely proportional to the resonant capacitor. The paper designed a level instrument based on variable frequency oscillation method. Clapp oscillator was used to measure capacity. The 1/256 frequency was sent to microcontroller. The level was calculated by frequency along with the change in capacity. The test resuhs show the level instrument is with high precision, stable out- put signal. The instrument reaches level 0. 5 precision as the design requirements.

关 键 词：变频振荡法 克莱泼振荡器 物位测量 

分 类 号：TH816[机械工程—仪器科学与技术]