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文摘
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改进了傅里叶变换红外分析仪(FTIR)的硬件设计以实现温室气体及CO_2碳同位素比值的多组分、高精度、连续自动测量。首先,对FTIR分析仪测量系统进行了设计和理论分析,引入了温度和压力监控系统以及全密封气路干燥系统。然后,讨论了光谱的定量分析过程。最后,设计了标准气体对比测量实验。实验结果表明:分析仪测量CH_4,CO,CO_2和δ~(13)CO_2值的标准偏差分别为0.01×10~(-6),0.011×10~(-6),0.239×10~(-6)和0.572‰,与常规FTIR测量系统相比,其检测的标准不确定度分别提高了6.3,8.45,10.54和14.73倍,其系统误差分别提高了2.88,1.93,4.67和4.66倍;对比分析仪与同位素质谱仪对δ~(13)CO_2值的测量结果,标准偏差分别为0.572‰和0.171‰,二者测量的标准不确定度相近。所设计的温室气体及CO_2碳同位素比值FTIR分析仪能够满足多组分、高精度、连续自动测量的需要。 |
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其他语种文摘
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The hardware design of a Fourier Transform Infrared (FTIR) analyzer was improved to realize the simultaneous and continuous measurements of greenhouse gases and δ~(13)CO_2 values in high Precision. Firstly, the FTIR measurement system was designed and analyzed theoretically, and the temperature and pressure monitoring systems and sealed drying gas circuit were introduced into the spectroscopy. Then the process of quantitative spectral analysis was presented. Finally, the comparative measurements were designed by using standard gases. Experimental results on CH_4, CO, CO_2 and δ~(13)CO_2 indicate that the Standard Deviations(STD) measured by the designed analyzer are 0.01, 0.011, 0.239×10~(-6) and 0.572‰, the standard uncertainty of designed measurement system is improved about 6.3, 8.45, 10.54 and 14.73 times that of routine FTIR measurements, and the system errors are improved about 2.88, 1.93, 4.67 and 4.66 times, respectively. The comparison of the measurement results between the analyzer and the Isotope Ratio Mass Spectrometer (IRMS) for δ~(13)CO_2 value shows that the STDs are 0.572‰ and 0.171‰ respectively, and the standard uncertainty of the both methods is similar. The FTIR analyzer for greenhouse gases and carbon isotope ratios satisfies the requirements of measurements for multi-species, online and high precision. |
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来源
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光学精密工程
,2014,22(9):2359-2368 【核心库】
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DOI
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10.3788/ope.20142209.2359
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关键词
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傅里叶变换红外光谱仪
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温室气体
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碳同位素比值
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多组分测量
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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, 国家环境保护环境光学监测技术重点实验室;;中国科学院环境光学与技术重点实验室, 安徽, 合肥, 230031
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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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1004-924X |
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学科
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环境质量评价与环境监测 |
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基金
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中国科学院战略性先导科技专项
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国家自然科学基金资助项目
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国家重大科学仪器设备开发专项
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"十二五"农村领域国家科技计划资助项目
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文献收藏号
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CSCD:5238921
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