差动结构电涡流式液位传感器性能改进与应用  

Modification of Differential Eddy Current Level Sensor and It's Application

作　　者：李剑[1] 丁天怀[1] 徐玉铮[1] 傅志斌[1] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084

出　　处：《仪表技术与传感器》2003年第2期12-14,共3页Instrument Technique and Sensor

摘　　要：为满足超薄快速铸轧机对熔铝液位精确测量的要求 ,对原有的用于钢水液位检测的差动结构电涡流式液位传感器进行了改进。传感器为发射接受式 ,1个发射线圈 ,两个接受线圈。由于采用差动结构 ,减小了环境、温度等因素对系统的影响 ,前置电路中核心部分采用反馈放大电路。通过对前置电路关键参数进行优化 ,提高了传感器示值稳定度 ;采用曲线拟合法处理输出信号提高了传感器的测量精度。测量结果表明 ,改进后的差动结构电涡流传感器在 89mm量程范围内精度达到± 0 .12mm ,稳定度为 0 .5 2 %。Existing differential eddy current level sensor is used for measure of moltem steel level.It is improved to fulfil ultrathin fast foundry and roll machine's requirement of precious measure of molten aluminium level.This emit-receive type sensor is made up of one transmitter coil and two receiver coils.Differential structure decreases circumstance and temperature's influence.The core of preamplifier is reactive circuit.Precision is improved by processing output signal with curve fit.Stability is improved by optimizing key parameter of preamplifier.Measure result proves that the sensor's precision is ±0.12?mm and its stability is 0.52% in the range of 89?mm.

关 键 词：差动结构 电涡流式液位传感器 性能改进 熔铝液位 

分 类 号：TP212.12[自动化与计算机技术—检测技术与自动化装置] TH816[自动化与计算机技术—控制科学与工程]