基于激光检测提高复合面源排放测量精度研究

Improving measurement accuracy of composite non-point sources emissions based on laser detection

在面源气体排放的测量过程中,不可避免地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。为了提高测量精度,研究了基于激光光谱检测的复合面源甲烷非均匀排放测量方法。通过多次自标定测量,减少了外部环境的干扰。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。它具有农业气体排放,环境气体检测等实用工程价值。

In the measurement of source emissions,it is inevitably interfered by the gas emissions from the adja⁃cent fields and turbulence,which affects the accuracy of gas detection.In order to improve the measurement accu⁃racy,the measurement method of composite non-point sources non-uniformity methane emissions based on laser spectrum detection has been studied.Moreover,the interference in external environment is reduced with multiple self-calibration measurements.A detection system for composite non-point source emissions has been estab⁃lished,and the detection method of eliminating gas fluctuation has 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 the photo acoustic spectrum,and the correlation coefficient reached 0.91.Finally,the actual field measurement has been carried out to monitor the two nonuniform emission sources caused by different fertilization methods to achieve accurate measurement.It has practi⁃cal engineering value such as agricultural gas emission and environmental gas detection.