热导率
材料科学
温度计
补偿(心理学)
加热元件
探测器
氢
电阻温度计
微电子机械系统
热的
电导率
光电子学
温度测量
分析化学(期刊)
复合材料
光学
化学
热力学
物理
色谱法
心理学
有机化学
物理化学
精神分析
作者
Takashi Harumoto,Ji Shi,Yoshio Nakamura,Hiroyuki Fujiki
标识
DOI:10.1016/j.sna.2023.114446
摘要
Enhanced hydrogen gas detectability was demonstrated with the sweep heating thin-wire thermal conductivity detector. The employment of the thinner wire contributes to expanding the detectability. Also, the method for compensating room temperature is proposed based on the resistance measured at the minimum current, which represents room temperature. Therefore, the temperature compensation can be performed without an additional thermometer. Nevertheless, the effect of the compensation is significant, and the fluctuations due to room temperature were removed almost completely. Accordingly, the sensor can detect down to 0.3%H2 (3000 ppm) concentration with 0.1%H2 resolution (0.00007 W/(m∙K) resolution in thermal conductivity), even though the sensing element is only the bulk thin-wire and the operation temperature is near room temperature. This detectability is comparable to the MEMS-based sensor. Therefore, the sweep heating is very powerful, practical, and cost-effective driving method. This is because the sweep heating can acquire much more information as compared with the typical heating methods.
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