单壁碳纳米管无线瓦斯浓度传感器设计研究

Design and Research on Wireless Methane Concentration Sensor Based on Single Wall Carbon Nanotube

针对物联网远程监测煤矿井下瓦斯浓度，提出基于功能化碳纳米管（FunctionalizedCNTs）的钯负载型单壁碳纳米管（Pd—SWCNTs）的瓦斯浓度传感器解决方案。传感器整体呈可弯折薄片状，集成有天线、T型阻抗匹配网络、CMOS射频／直流（RF／DC）整流器和Pd—SWCNTs传感器探头等功能模块。传感器构成物联网的感知端，其检测的瓦斯浓度信息由物联网的移动探测器接收并识别。研究表明：在环境温度为18～38℃的煤矿井下，移动探测器采用增益为2．15dBi的天线，发射功率为2W。在距离传感器1m处，对瓦斯的浓度从0增长到100×10-6的过程进行检测。结果显示：探测器接收信号强度标识指标对应增加4dB，相对模拟识别符指标对应增加3％。

According to the internet of things used for detecting the concentration of methane in the coal mine industry, a total solution of sensor borne with the single walled carbon nanotube loaded by palladium （Pd-SWCNTs） has been figured out on the basis of the protocol of the functionalized CNTs. The proposed sensor would be assembled by such functional modules as an antenna, a T-typed impedance match networks;a CMOS RF/DC rectifier and a Pd-SWCNTs sensor head, which being portrayed by a thin film with much flexibility, would become the cognitive end of the internet of things to commit to detect the concentration of methane that were readily received and identified by the movable detector end of the internet of things totally in remote ways. Study have shown that when adopting an antenna gained by 2. 15 dBi, and the transmitting power was 2 W, in corresponding to concentration of methane escalating from 0 to 100x 10-6 at the distance 1 meter away from sensor end.The result displayed that the movable detector end of the internet of things could achieve incre- ment of the received signal strength index by 4 dB, and accordingly,the percent increment of comparative analog identifier by 3%.