School of Computer Science and Technology, Harbin University of Science and Technology, 52 Xuefu Road, Harbin 150080, China.
Sensors (Basel). 2018 Sep 13;18(9):3088. doi: 10.3390/s18093088.
A novel way to measure humidity through testing the emissivity of an area radiant source is presented in this paper. The method can be applied in the environment at near room temperature (595 °C) across the relative humidity (RH) range of 2090% RH. The source, with a grooved radiant surface, works in the far infrared wavelength band of 8~12 μm. The Monte-Carlo model for thermal radiation was set up to analyze the V-grooved radiant surface. Heat pipe technology is used to maintain an isothermal radiant surface. The fuzzy-PID control method was adopted to solve the problems of intense heat inertia and being easily interfered by the environment. This enabled the system to be used robustly across a large temperature range with high precision. The experimental results tested with a scanning radiant thermometer showed that the radiant source can provide a uniform thermal radiation capable of satisfying the requirements of humidity testing. The calibration method for the radiant source for humidity was explored, which is available for testing humidity.
本文提出了一种通过测试面源发射率来测量湿度的新方法。该方法可应用于环境温度接近室温（595°C）、相对湿度（RH）范围为 2090%RH 的环境中。该辐射源具有波纹状辐射表面，工作在 8~12μm 的远红外波长带。建立了用于热辐射的蒙特卡罗模型来分析 V 形槽辐射表面。热管技术用于保持等温辐射表面。采用模糊-PID 控制方法解决了热惯性强、易受环境干扰的问题。这使得系统能够在大温度范围内稳健地运行，并具有高精度。使用扫描辐射温度计进行的实验结果表明，辐射源可以提供均匀的热辐射，能够满足湿度测试的要求。探索了用于湿度测试的辐射源的校准方法。
