基于CPLD的数字湿度计设计

介绍了以CPLD为核心的数字湿度计的设计方法。采用该方法设计的数字湿度计具有结构简单、外围电路少、抗干扰能力强、功耗小、可靠性高、速度快、反应时间短等优点。     

湿度测量技术在环境试验设备中的应用探讨

本文探讨了几种常用湿度测量技术在环境试验设备中的应用情况。     

巧显温度计

温度计对于大家来说并不以为奇,水银式的温度计,温度湿度计、数字温度计……那笔者为何要与大家聊起这个常见而不稀奇的温度计昵？关键在于笔者要介绍的这个巧显温度计有一个比较新颖的亮点？或许对其他爱好者的设计有所帮助。     

基于SPCE061A的湿度语音播报系统设计

凌阳SPCE061A是语音功能非常突出的单片机,基于SPCE061A单片机的数字湿度检测系统是一种集湿度测量和语音播报于一体新型语音湿度计。对系统的进行硬件电路设计以及软件架构设计,并对主要部分进行了C语言编程。     

地基和星载微波辐射计数据反演大气湿度

分析了地基和星载微波辐射计设计指标和探测特点.利用大气辐射传输理论和毫米波传播模型,1993(MPM93)和大气吸收系数模型,建立大气正演辐射传输模型.仿真风云三号A星(FY-3A)星载微波湿度计和地基探测仪的亮温数据,误差在允许范围内.对比星载和地基微波辐射计不同高度反演精度和均方差,建立基于3层神经网络算法的联合地...     

一种温湿度测控电路芯片的研制

提出了一种运用混合信号的温湿度测量控制电路的设计方案。通过温湿度传感器的电阻变化来检测温湿度的变化,运用RC振荡原理,把传感器的电阻值转换为频率信号,并使用一片ROM把频率信号映射为实际的温湿度,从而实现温湿度的测量。在芯片设计中,详细考虑了如何进行综合的优化设计。芯片的温度测量范围为-20～60°C,精度为±1°C;湿度测量范围为40%RH～90%RH,精度为±10%RH。芯片测试结果表明,该电路功能正确,性能良好,各项指标均达到预定目标。     

Impedance hygrometer based on cellulose and CuPc

In this study an investigation has been made on the properties of impedance hygrometer fabricated using cellulose and copper phthalocyanine (Ag/Cellulose/ CuPc/Ag). The 5 wt% suspension of cellulose was prepared in water while the CuPc was dissolved in methanol. Film of cellulose was deposited on glass substrates with preliminary deposited metallic electrodes followed by deposition of CuPc film. The resistances and capacitances of the samples were evaluated under the effect of humidity. The impedance was calculated from resistance and capacitance measurements. It was also measured during the experiment. It was observed that the capacitance of the sensor increases and resistance and impedance decrease with increase in the relative humidity level. It was found that impedance-humidity relationship showed more uniform changes in the interval of 31%-98% RH than the resistance- and capacitance-humidity relationships that showed visible changes in the humidity interval of 31%-80% RH and 80%-98% RH respectively. Humidity dependent impedance of the sample makes it attractive for use in impedance hygrometers. The impedance hygrometer may be used in the instruments for environmental monitoring of humidity.