Detection of aerosol extinction characteristics and Ångström index by monitoring pollutants lidar
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摘要: 为了研究测污激光雷达对水平能见度和垂直气溶胶消光系数变化趋势的探测，采用污染气体探测激光雷达，以斜率法和Fernald方法，反演了301.5nm和446.6nm在水平及垂直方向的消光系数，以及波长的Ångström指数。结果表明，水平方向上，301.5nm和446.6nm的消光系数和能见度随时间变化均保持一致性；垂直方向上，301.5nm和446.6nm气溶胶消光系数随时空变化趋势相同，Ångström指数随着时间的推移有所变化，但空间变化趋势相同。该结果对分析差分吸收激光雷达修正气溶胶的影响是有所帮助的。
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关键词:
- 激光技术 /
- 气溶胶消光系数 /
- 激光雷达 /
- Ångström指数
Abstract: In order to study the detection of horizontal visibility and vertical aerosol extinction coefficient by monitoring pollutants lidar, the extinction coefficients of 301.5nm and 446.6nm in horizontal and vertical directions and wavelength Ångström index were retrieved by the slope method and the Fernald method. The result shows that, in the horizontal direction, the extinction coefficients and visibility of 301.5nm and 446.6nm vary with time consistently. In the vertical direction, the extinction coefficients of 301.5nm and 446.6nm follow the same trend in time and space. The Ångström index has changed with the change of time. But the spatial change trend is the same. The results are helpful to correct the effect of analytical differential absorption lidar on aerosol.-
Keywords:
- laser technique /
- extinction coefficient of aerosol /
- lidar /
- Ångström index
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Figure 2. Relationship between echo signal ln [P(z)z2]and distance z of atmospheric horizontal
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Figure 3. The fitting curve of echo signal ln[P(z)z2] and distance z of atmospheric horizontal at 301.5nm and 446.6nm
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Figure 4. The atmospheric level of visibility at 301.5nm and 446.6nm changes with time
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Figure 5. Spatial and temporal distribution of aerosol extinction profile and corresponding Ångström index
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Figure 6. Aerosol extinction profile and corresponding Ångström index at 2016-11-01T21:10
Table 1 Specification of monitoring pollutants lidar
transmitter(SO2) waelength 300.05nm(on), 301.5nm(off) laser class USA continum 8010 Nd:YAG laser(532nm) pump, Germany radiant dye laser(600.1nm, 603nm) repetition 10Hz energy 8mJ transmitter(NO2) waelength/nm 448.1nm(on), 446.6nm(off) laser class USA continum 8010 Nd:YAG laser(355nm) pump, Germany radiant dye laser(446.6nm, 448.1nm) repetition 10Hz energy 5mJ receiver telescope near newtonian，focus length 750mm，diameter 350mm，field of view 0.2mrad~2mrad optical filter central wavelength 300.75nm, band width 3.0nm(SO2), block OD5(200nm~1100nm), Φ=25.4mm; central wavelength 447.50nm, band width 3.0nm(NO2), block OD5(200nm ~1100nm), Φ=25.4mm detector (PMT) 9142QB，Φ=25mm，185mm~650mm, rise time <50ns，gains 105~106，voltage 750V~1200V A/D PCI-9826H, 20MS/s，channel number 4(16bit) 
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Table 2 Molecular extinction coefficient of three kinds of atmospheric pollutants at the corresponding wavelength
pollutant NO2 SO2 O3 waelength/nm 301.5 446.6 301.5 301.5 N(z)σ(λ0)/km－1 0.014 0.043 0.025 0.034
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