采用双高分子薄膜电容式湿度传感器补偿的低湿区露点测量的研究

Research on Measurement of Dew Point Under Low Humid Made up Double High Molecule Film Capacitor Humidity Transducer

介绍一种采用两个高分子薄膜湿度传感器来实现温度补偿的低湿区露点仪。把其中一个传感器封装于干燥气体中 ,另外一个传感器处于待测环境中 ,通过相同的C/F变换电路后 ,经PhilipsP87LPC76 4单片机测频 ,再由软件进行内部差频、曲线拟合等多种手段处理 ,得到温度补偿后的测量数据 ,以达到采用简单设备、低成本的传感器而快速测量低露点的目的。本文以实验数据、过程为基础 ,对高分子薄膜湿度传感器应用特点、温度特性、补偿原理及露点测试仪的构成进行了分析和讨论。

A low dew point meter made up of double high molecule film capacitor humidity transducer for temperature compensation is introduced.In the meter,the Philips MCU P87LPC764 is used as the core controlling unit.A soft program for interior beat frequency and curve fitting are embedded.The principle of temperature compensation and soft correction are discussed based on data of experiment.The application features and temperature characteristics of high molecule film capacitor humidity transducer are analyzed.