基于CAN总线的仓库温湿度监控系统的设计

为了提高仓库监控系统的可靠性和传输距离,设计了基于CAN总线的仓库监控系统。系统采用分布式网络结构,主要分为上位机和下位机两部分。上位机主要完成了EPP并口协议的CAN通讯适配器的设计以及仓库人机界面的软件设计;下位机主要完成了CAN节点和温、湿度等参数的传感器选型和对温、湿度等参数控制器的设计。设计的系统满足对大库区的环境参数实时检测的要求。     

MEMS湿度传感器信号采集与数字化处理研究

MEMS（微电子机械系统）湿度传感器是利用标准的CMOS技术加上MEMS的后处理技术制造,以其体积小、响应快等优点受到越来越多的重视,介绍了本实验室研制的MEMS压阻式湿度传感器的测试原理、硬件电路的设计和传输函数模型的建立,以及软件设计和封装设计,最后给出了样机的测试结果。     

超声波加热加湿及恒温恒湿控制系统

以单片微机AT89S52为核心,利用温度传感器DS18B20和湿度传感器CHTM-02/N对室内温度、湿度进行检测,并控制超声波雾化器进行加热加湿以维持室内恒温恒湿。系统成本降低,效率提高,具有非常广泛的市场应用价值。实现了温度、湿度的智能控制。系统动态响应好,控制精度高,加热加湿效率高。     

偶氮苯基型离子液体溶液对空气中湿度的变色响应

Room temperature ionic liquids (ILs) that can exhibit a colorimetric response to moisture in the air are rarely reported in the literature. In this study, an azophenolic IL solution exhibited a spontaneous a colorimetric response, driven by the formation of hydrogen bonding between the [PhN＝NPhO] anion and moisture in the air. This phenomenon was clearly understood using ultraviolet-visible (UV-Vis) absorption spectroscopy, nuclear magnetic resonance (NMR) spectra, experimental data, and theoretical calculations. Specifically, in the UV-Vis absorption spectra, absorption around 455 nm decreased, while the band around 343 nm increased in the IL CHCl₃ solution as time progressed; this was accompanied by a color change from orange to faint yellow. This spontaneous, self-responsive process was further observed using ¹H NMR data. When the IL solution was placed with sufficient time, all the ¹H NMR peaks of the azophenolic anion shifted downfield, but no new signals appeared in the upfield region. The reason for this was easily identified as the stimuli in the air, such as CO₂ and moisture. When pure CO₂ was bubbled through the IL CHCl₃ solution, the solution color changed from its original orange to light orange, but could not change further to faint yellow, which ruled out CO₂ gas as a stimulus. When a small amount of water was gradually added to the IL solution (MeCN solvent), the absorption band around 474 nm decreased, coupled with an increase in the absorption band around 347 nm. This was accompanied by a color change from orange to faint yellow, which was almost identical to the self-responsive process in CHCl₃ and CCl₄. Moreover, two cuvettes of IL CHCl₃ solution were placed under relative humidities of 28% and 100%, respectively; the IL CHCl₃ solution required a much longer time to exhibit a complete color change from orange to faint yellow under a lower relative humidity, demonstrating that moisture is the most likely stimulus triggering the self-responsive color change of the IL solution. As revealed by the Gaussian 09 program at the B3LYP/6-31++G(p, d) level, the distance between the oxygen atom on the azophenolic anion and the hydrogen atom on the H₂O molecule was 0.174 nm, and the corresponding angle was 171.12°. Furthermore, the atomic dipole moment corrected Hirshfeld (ADCH) charge of the oxygen atom on the azophenolic anion was −0.52, and it increased to −0.62 after the azophenolic anion interacted with the H₂O. Reduced density gradient analysis revealed that the spike corresponding to O∙∙∙H―O for the IL-H₂O complex was located at around −0.04 a.u.. All the above data indicate that the presence of hydrogen bonding rendered the IL solution responsive to the moisture stimulus, and this response was accompanied by a color change that was visible to the naked eye. To the best of our knowledge, this is the first demonstration of a colorimetric change in an IL solution in response to moisture. We hope this work can help us to gain insight into some seemingly abnormal phenomena that occur during the research process.     

基于超分子离子晶体的湿度传感构效关系研究

相对湿度是许多领域的关键参数,环境湿度与人们的生活密切相关,因此对湿度进行测量和控制是各个领域中值得关注的问题之一. 在前期的研究中,作者制备了一种新型的超分子离子材料（SIM）,它是由基于咪唑的双阳离子（如1,10-双（3-甲基咪唑-1-基）癸烷,C₁₀(mim)₂）和电活性二阴离子（如2,2'-连氮基-双（3-乙基苯并噻唑啉-6-磺酸）,ABTS）组成的,发现其对湿度具有敏感且快速的响应. 在此基础上,本文制备了6种不同碳链（C₄,C₆,C₈,C₁₀,C₁₂,C₁₄）的咪唑基化合物,发现其中3种（C₁₀,C₁₂,C₁₄）可与ABTS形成水稳定的SIM. 循环伏安法、计时电流法以及石英晶体微量天平表征了这些超分子离子材料的湿度传感性能,发现基于C12的SIM具有最佳的湿度传感性能. 同时,SEM结果显示随着碳链的增加,离子材料的厚度变薄并且形态变得不规则. 因此,作者认为疏水作用和材料比表面积均会影响湿度传感的灵敏度. 本研究为发展新的湿度响应的离子传感材料奠定了基础.     

电阻和电容型湿度传感器的物理性能及其应用

1 引言 在电子科学技术日益发达的今天,人类对自身的生活环境及工作环境要求越来越高.湿度的监测与控制在国民经济各个部门,如国防、科研、煤炭开采和井下监测以及人民生活等诸多领域有着非常广泛的应用.     

漫谈雾及其消除技术

深秋或初冬季节,常会出现大雾天气。当大气中的水蒸气含量达到饱和时,就有可能在气溶胶微粒上凝聚成小水滴或小冰晶,凝聚后的小水滴漂浮在近地面空气中,形成雾。雾的形成有三个必备条件：近地面空气湿度较大,近地面空气中的水蒸气浓度达到过饱和,空气中有凝结核使水蒸气遇冷形成悬浮小水滴。     

基于MSP430单片机的便携式温室湿度、温度记录仪的设计

文章设计了一种低功耗便携式温室湿度、温度记录仪,该检测系统以低功耗MSP430单片机为主控,利用温度传感器、湿度传感器模块,进行温度、湿度的测量;通过时钟芯片和12864液晶实现数据的实时显示;通过E2PROM进行数据的实时存储和查询。该记录仪具有小型化、实时化、低功耗和便携式等特点,通过测试,该设备能达到普通民用温室的测量精度要求,节能、稳定,可应用于温室种植研究的温度、湿度数据监测及记录。     

湿蒸汽参数后向异轴散射测量模型的优化及实验研究

为了能够对汽轮机湿蒸汽各参数的变化进行精准的监测,提高汽轮机内部除湿技术和机组的运行效率,对湿蒸汽参数后向异轴散射测量模型进行了优化和实验研究。基于Mie散射理论建立了湿蒸汽测量模型,对原散射体的几何模型进行优化;通过MATLAB对该模型进行了仿真模拟,计算得到当接收距离d=0.32 m,水滴群质量中间半径r0.5=1 μm,尺寸分布参数K=5和水滴数浓度N=2.5×1011时,散射光强值达到最佳。利用相减消光法和均值滤波法对CCD相机信号进行了提取和处理,并对不同工况下的湿蒸汽参数进行了实验测量计算与反演,实验反演的结果和仿真模拟的结果变化趋势吻合。研究结果验证了基于CCD的后向异轴散射测量模型的准确性和测量汽轮机蒸汽湿度实验研究的可行性,为今后的汽轮机蒸汽湿度测量提供了科学依据。