基于激光光谱检测的提高复合面源非均匀甲烷排放测量精度的研究
投稿时间:2020-07-18  修订日期:2020-08-21  点此下载全文
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作者单位E-mail
唐七星 中国科学院环境光学与技术重点实验室 qxtang@ahau.edu.cn 
张玉钧 中国科学院环境光学与技术重点实验室  
何莹 中国科学院环境光学与技术重点实验室  
王立明 中国科学院环境光学与技术重点实验室  
李梦琪 中国科学院环境光学与技术重点实验室  
尤坤 中国科学院环境光学与技术重点实验室  
李潇毅 中国科学院环境光学与技术重点实验室  
陈东 合肥工业大学  
刘文清 中国科学院环境光学与技术重点实验室  
基金项目:国家自然科学基金项目;中科院科研仪器设备研制项目;安徽省重点研究和开发计划;安徽省自然科学基金面上项目
中文摘要:在面源气体排放的测量过程中,不可避免的受到相邻田地气体排放干扰,又受到环境扰动的影响,影响气体检测的准确性。基于激光光谱检测提高复合面源非均匀甲烷排放量测量精度的研究,通过在一个测量周期内,多次自标定测量,根据不等精度与不同的贡献系数进行数据融合。设计了非均匀面源排放物检测系统,并提出了消除气体波动检测方法。首先进行了准确性验证试验,待测源a的标准差为0.17,待测源b的标准差为0.18;随后与光声光谱抽取式进行了对比试验,相关系数达到0.91;最后开展了外场实际的测量应用,对不同施肥方式造成的两个不均匀排放待测源进行监测,实现对多源不均匀排放的准确测量。具有农业气体排放,环境气体检测等实用工程价值。
中文关键词:激光吸收光谱  准确测量  非均匀  复合面源
 
Improving measurement accuracy of composite non-point source non-uniformity methane emissions based on laser spectrum detection
Abstract:In the measurement of source emissions, it is inevitable interfered by the gas emissions from the adjacent fields and turbulence, which affects the accuracy of gas detection. Research on improving measurement accuracy of composite non-point source non-uniformity methane emissions based on laser spectrum detection to realize the accurate discrimination. In a measurement cycle, self calibration measurement is carried out for many times. Data fusion is based on unequal precision and different contribution coefficient. A detection system for composite non-point source emissions has been designed, and detection method of eliminating gas fluctuation have been proposed. First, the accuracy verification test has been carried out. The standard deviation of source a is 0.17, and that of source b is 0.18. Subsequently, a comparative test has been carried out with the extraction method of photoacoustic spectrum, and the correlation coefficient reached 0.91. Finally, the actual field measurement has been carried out to monitor the two non-uniform emission sources caused by different fertilization methods to achieve accurate measurement. It has practical engineering value such as agricultural gas emission and environmental gas detection.
keywords:Laser  absorption spectroscopy, accurate  measurement, non-uniformity, composite  non-point  source
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