一种便携SAW气体传感器的电路设计

该文采用信号处理技术,设计了一种振荡电路。该电路解决了双延迟线型声表面波(SAW)器件不易起振,频率跳变等问题。整个电路结构简单,对插损低于20 dB的器件有很好的起振效果,满足气体检测的需要。     

Comparative Analysis of Experiment Treating Benzene and CEES by Pulse Corona Plasma

Based on an experiment treating benzene and 2-chloroethyl ethyl sulfide （CEES） by pulse corona induced-plasma, the simiarities and differences found in the experimental data and analytical results are analyzed in a comparative manner in this paper. The theory applied is also discussed.     

Experiment and Analysis on the Treatment of Gaseous Benzene Using Pulsed Corona Discharge Plasma

An experiment and analysis on removal of gaseous benzene by pulse corona inducedplasma is presented in this article. Important parameters effecting removal efficiency have been investigated, such as pulse peak voltage, pulse frequency, gas inlet concentration, gas flow rate and reactor temperature. The result shows that the removal efficiency increases with the increase in pulse peak voltage, pulse frequency and reactor temperature, but decreases in the rise of gas inlet concentration and gas flow rate. On the condition of Vp = 36 kV, f = 80 Hz, C = 1440 mg/m^3 and Q = 640 ml/min, the largest removal efficiency is 98%. Finally, the reacted products are qualitatively analysed and the reaction processes are deduced in combination with plasma-chemistry theory.     

聚苯胺-多壁碳纳米管薄膜SAW NO2传感器

将聚苯胺-多壁碳纳米管聚合物沉积于声表面波(SAW)气体传感器的敏感区,形成敏感薄膜,实现了室温下对不同体积分数NO2的检测.研究表明:这种传感器具有很高的敏感性,良好的重复性和低体积分数检测极限.同时,单一聚苯胺薄膜也做了对比测量,实验结果表明:聚苯胺-多壁碳纳米管聚合物敏感膜比单一聚苯胺薄膜具有更高的敏感性和更短的...     

Ar／O2等离子体处理烟草中主要化学成分的初步研究

为了优化调制烟叶中的化学成分,采用了低温常压Ar／O2等离子体处理方法结合近红外光谱分析,对烟草考察了不同放电时间的处理效果。结果显示：等离子体处理后,烟碱等主要的五种化学成分的含量随处理时间的增加均有改变。因此,需要对输入气体、放电电压、放电距离等更多的影响因素进行深入研究,达到提高烟叶品质的目的。     

防爆安检用地井井盖橡胶封条的研制

简介防爆安检用地井井盖橡胶封条的研制。防爆安检用地井井盖橡胶封条呈近似正方形(边长约72 mm)形状,由橡胶面层、橡胶粘合层和防粘层组成。橡胶面层有由两组并行排列的不连续弧形镂刻花纹组成的预裂口,正面印有警示标识及计算机识别编码。橡胶面层胶和橡胶粘合层胶主体材料分别采用三元乙丙橡胶和丁基橡胶。防爆安检用地井井盖橡胶封条已广泛应用。     

室温下ZnPc/MWCNTs敏感膜检测NO2

提出了一种以酞菁锌(ZnPc)掺杂多壁碳纳米管(MWCNTs)作为声表面波(SAW)传感器的敏感材料用于室温下检测二氧化氮(NO2).通过超声振荡等方法将研磨的MWCNTs和ZnPc分散于N,N-二甲基中,然后运用微量移液器滴涂到SAW器件的敏感区.我们对ZnPc/MWCNTs薄膜用扫描式电子显微镜(SEM)进行了表面形态表征.实验结果表明,基于MWCNTs的ZnPc SAW器件能在常温下检测最低浓度为10-6的NO2.在3个月内对器件的灵敏度、稳定性、选择性也进行了评估.