大气与环境光学学报, 2008, 3 (1): 0047, 网络出版: 2010-05-21
大气中甲醛差分吸收光谱测量方法研究
Formaldehyde Measurement in Atmosphere with DOAS Method
环境光学 数据处理 浓度反演 差分吸收光谱 environmental optics data processing concentration retrieving differential optical absorption spectroscopy(DOAS)
摘要
差分吸收光谱技术(DOAS)由于时间分辨率高、高灵敏度和操作费用低等特点非常适合对大气中痕量气体HCHO进行实时追踪。对HCHO的测量方法和数据反演进行了研究,通过增大信噪比,扣除背景杂散光等手段对其进行了准确测量;详细介绍了数据的处理方法,包括反演波段的选择、干扰结构的去除、数据处理流程和谱线的非线性处理。对不同波段反演HCHO的干扰因素、反演浓度结果和反演准确度进行了分析与对比,结果显示,314~332 nm是HCHO浓度反演的最佳波段。对广州市的HCHO进行了实时、连续监测,并取得了有效数据。
Abstract
With excellent response characteristics, high detection sensitivity and low operational cost, differential optical absorption spectroscopy(DOAS) is a powerful tool to trace concentration variation of trace HCHO.The accurate measurement of HCHO is achieved through improving the ratio of signal to noise and correcting the background scattering light, and the retrieving method of HCHO is developed including the selection of retrieval wavelength, the removing of interfering structures, steps of data processing and the spectrum dealing with nonlinear method. The HCHO concentration retrieved in different wavebands are compared. As a result the band from 314 nm to 332 nm is most suitable for the retrieval of HCHO.
彭夫敏, 谢品华, 张英华, 司福祺, 李素文, 秦敏, 刘文清. 大气中甲醛差分吸收光谱测量方法研究[J]. 大气与环境光学学报, 2008, 3(1): 0047. PENG Fu-min, XIE Pin-hua, ZHANG Ying-hua, SI Fu-qi, LI Su-wen, QIN Min, LIU Wen-qing. Formaldehyde Measurement in Atmosphere with DOAS Method[J]. Journal of Atmospheric and Environmental Optics, 2008, 3(1): 0047.