离轴石英谐振光声光谱CO_2传感研究
Detection of carbon dioxide based off-beam quartz enhanced photoacoustic spectroscopy
查看参考文献27篇
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文摘
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二氧化碳(CO_2)不仅是一种重要的温室气体,也是具有危害性的窒息性气体,因此发展小型化、高灵敏度的CO_2浓度传感器对无人机载、探空球等探测大气CO_2以及在空间封闭环境的CO_2浓度监测等领域具有较大的应用需求。开展了基于2.0 µm可调谐半导体激光器的CO_2传感研究,搭建了CO_2探测实验系”统。系统以4989.97 cm~(-1)处的CO_2吸收谱线为研究对象,采用微小型离轴石英音叉增强型光声光谱新技术对CO_2气体传感进行研究。通过优化调制频率和调制振幅等参数,确定了CO_2传感系统的最佳参数。在最优实验参数条件下对CO_2气体进行探测,获得系统的最小探测灵敏度为142 µL/L,最小归一化等效噪声吸收系数为3.37×10~(-8) cm~(-1)W/Hz~(1/2). |
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其他语种文摘
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Carbon dioxide (CO_2) is not only an important greenhouse gas, but also a harmful asphyxiating gas. Therefore, the development of miniaturized, high-sensitivity concentration sensor of CO_2 has great application requirements for detecting atmospheric CO_2 by unmanned aerial vehicles, sounding balloons, and monitoring CO_2 concentration in space-enclosed environments. An experimented setup based on 2.0 μm tunable semiconductor laser was established for the detection of CO_2 concentration. The CO_2 absorption line at 4989.97 cm~(-1) was chosen as the target line, and the CO_2 gas sensing was carried out using microminiature off-beam quartz enhanced photoacoustic spectroscopy. By detecting the photoacoustic signals of a certain concentration of CO_2 at different modulation frequencies and modulation amplitudes, the optimal modulation frequency and modulation amplitude of the system were obtained. The CO_2 gas is detected under the optimized parameters,a detection limit of 142 μL/L is achieved, which corresponds to a normalized noise equivalent absorption coefficient of 3.37× 10~(-8)cm~(-1)W/Hz~(1/2). |
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来源
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量子电子学报
,2019,36(2):137-142 【扩展库】
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DOI
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10.3969/j.issn.1007-5461.2019.02.002
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关键词
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光谱学
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灵敏度
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石英音叉光声光谱
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二氧化碳
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地址
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中国科学院安徽光学精密机械研究所, 安徽, 合肥, 230031
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中国科学技术大学, 安徽, 合肥, 230026
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-5461 |
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学科
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物理学 |
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基金
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国家重点研发计划
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国家自然科学基金
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文献收藏号
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CSCD:6464309
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