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中文摘要：
提出一种基于双壁碳纳米管（CNTs）宏观体的新型热线流速探针,该探针采用微加工技术组装热敏感元件并通过在接触区电沉积镍颗粒提高敏感结构的稳定性。作为热线元件的CNTs有比铂丝更高的电阻温度系数,温度为293～393K时,其电阻温度系数从0.3727%/°C逐渐增加至0.5601%/°C。根据热平衡原理,通过恒流模式测量同一个探针在不同流场中输出电压的变化来计算电阻的变化,从而得到流速的大小。实验表明,该CNTs流速探针的灵敏度比传统的热线流速计高,重复性好,作为热线敏感材料是可行的。
英文摘要：
A new type of hot-wire anemometer（HWA） probe based on macro-sized double walled carbon nanotube strands（CNTs） is presented.The thermal element is assembled by a microfabrication process and electrodepositing nickel particles are introduced to improve the stability of sensitive structure.The CNTs thermal element possesses larger temperature coefficient of resistance（TCR） than Pt100,which is about 0.372 7%/°C to 0.560 1%/°C in the temperature range from 293 K to 393 K.According to the heat balance principle,the velocity can be obtained by measuring the resistance of the CNTs with different velocity field under constant current（CC） mode.Compared with commercial anemometer,the CNT probe shows improved characteristics with the maximum sensitivity of approximately 15.38%,and the measuring result is reversible.
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