基于侧向散射激光雷达的PM2.5浓度测量误差 
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Measurement Error of PM2.5 Concentration Based on Side Scattering Lidar
杭州电子科技大学通信工程学院, 浙江 杭州 310018
图 & 表
图 1. Clidar系统装置示意图
Fig. 1. Diagram of Clidar system setup
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图 2. 不同PM2.5浓度下的回波信号伪彩图。 (a) 低浓度; (b) 正常浓度; (c) 高浓度
Fig. 2. Echo signal pseudo color images under different PM2.5 concentrations. (a) Low concentration; (b) normal concentration; (c) high concentration
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图 3. 高、低增益下S(i)模型的PM2.5浓度反演值与实测PM2.5浓度值对比图。 (a) i=0; (b) i=20; (c) i=40; (d) i=60; (e) i=80
Fig. 3. Comparison of PM2.5 concentration derived from S(i) model with high gain and low gain and measured PM2.5 concentration. (a) i=0; (b) i=20; (c) i=40; (d) i=60; (e) i=80
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表 1Clidar系统的关键技术参数
Table1. Key technical parameters of Clidar system
| Apparatus | Parameter | Value |
|---|
| CCD detector (Watec WAT-902H2) | Pixel array /pixel×pixel | 768×576 | | | Pixel size /μm×μm | | 12.7×9.8 | | Minimum illumination /lx | | 0.0001 | | Angle per pixel /(°) | | 0.117 | | Lens (VM0410MPIR) | Focal length /mm | 4-10 | | | Aperture number | | 3.2 | | Horizontal angle of view /(°) | | 90 | | Laser (Nd∶YVO4) | Wavelength /nm | 532 | | | Pulse power /mW | | 500 | | Interference filter (ZLM-532ZDLGP-Y30) | Bandwidth /nm | 5 | | | Peak transmittance /% | | 80 | | Image acquisition card (DH-CG300) | - | - | | Computer (Dell-780MT) | - | - |
|
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表 2高、低增益下5种预测模型的参量
Table2. Parameters of five models under high gain and low gain
| Condition | Low gain | High gain | |
|---|
| S(0) | | S(20) | S(40) | S(60) | S(80) | S(0) | S(20) | S(40) | S(60) | S(80) |
|---|
| Empiricalformulaparameter | k=1086,b=1635 | k=1022,b=-4777 | k=657,b=-4208 | k=442,b=-1515 | k=247,b=1274 | k=2770,b=39443 | k=2871,b=23419 | k=2927,b=-1921 | k=2801,b=-19350 | k=2393,b=-21193 | | Average error /(μg·cm-3) | 4.45 | 5.40 | 7.54 | 8.29 | 8.46 | 3.30 | 2.97 | 3.25 | 3.84 | 5.05 | | Residualvariance | 28.59 | 3890 | 72.44 | 89.22 | 98.24 | 19.77 | 14.21 | 16.37 | 22.45 | 40.08 | | Comprehensivedeviation rate /% | 13.24 | 16.23 | 22.33 | 24.12 | 24.28 | 9.76 | 9.63 | 10.59 | 12.54 | 16.16 |
|
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陈松, 胡淼, 曾然, 李齐良, 周雪芳, 蔡美伶, 聂佳林, 汪延安. 基于侧向散射激光雷达的PM2.5浓度测量误差[J]. 光学学报, 2017, 37(12): 1201003. Song Chen, Miao Hu, Ran Zeng, Qiliang Li, Xuefang Zhou, Meiling Cai, Jialin Nie, Yan’an Wang. Measurement Error of PM2.5 Concentration Based on Side Scattering Lidar[J]. Acta Optica Sinica, 2017, 37(12): 1201003.
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