Acta Optica Sinica, Volume. 41, Issue 14, 1429001(2021)
Velocity Limitation in Dynamic Light Scattering Measurement for Flowing Aerosols
Figures & Tables(13)
Fig. 1. PSD inversion results of 223 nm unimodal aerosol under different noise levels. (a) 0; (b) 10－5; (c) 10－3
Fig. 2. PSD inversion results of 687 nm unimodal aerosol under different noise levels. (a) 0; (b) 10－5; (c) 10－3
Fig. 3. PSD inversion results of 152/734 nm bimodal aerosol under different noise levels. (a) 0; (b) 10－5; (c) 10－3
Fig. 5. Experimental results. (a) Intensity ACF and (b) inversion results of aerosol at different flow velocities
Fig. 6. Condition number of kernel matrix corresponding to 687 nm aerosol at different flow velocities
Fig. 7. PSI distributions of a 687 nm unimodal aerosol in corresponding ACF at different flow velocities
Fig. 8. Simulated ACF of unimodal aerosols with different particle sizes at flow velocity of 2.1 m/s. (a) 223 nm; (b) 458 nm; (c) 687 nm
Fig. 9. Relationship among aerosol particle size, flow velocity，and diffusion translation characteristic time ratio
Table 1. Parameters and properties of the simulated PSDs
View tableTable 1. Parameters and properties of the simulated PSDs
P /nm a1 μ1 σ1 a2 μ2 σ2 (dmin，dmax) /nm 223 1.00 4.1 5.5 0 - - (2.01，700.01) 687 1.00 3.0 5.3 0 - - (400.01，1200.01) 152/734 0.35 9.8 5.7 0.65 －4.8 4.8 (2.01，1000.01)
Table 2. Performance indices of the recovery of unimodal aerosol
View tableTable 2. Performance indices of the recovery of unimodal aerosol
P /nm Velocity /(m·s－1) 0 10－5 10－3 P /nm EP EF P /nm EP EF P /nm EP EF 223 0 223 0.000 0.032 223 0.000 0.037 229 0.027 0.043 0.3 223 0.000 0.032 223 0.000 0.053 223 0.000 0.058 0.6 223 0.000 0.031 217 0.027 0.072 223 0.000 0.080 0.9 223 0.000 0.045 217 0.027 0.105 223 0.000 0.099 1.2 223 0.000 0.066 217 0.027 0.080 217 0.027 0.119 1.5 217 0.027 0.093 217 0.027 0.107 217 0.027 0.134 1.8 217 0.027 0.103 211 0.054 0.117 211 0.054 0.145 2.1 206 0.076 0.133 211 0.054 0.117 206 0.076 0.155 687 0 687 0.000 0.027 687 0.000 0.037 680 0.010 0.058 0.3 680 0.010 0.083 680 0.010 0.094 680 0.010 0.083 0.6 667 0.029 0.128 680 0.010 0.086 673 0.020 0.127 0.9 660 0.039 0.167 660 0.039 0.166 660 0.039 0.169 1.2 640 0.068 0.183 647 0.058 0.189 627 0.087 0.186 1.5 647 0.058 0.185 - - 0.209 - - 0.208 1.8 633 0.079 0.193 - - 0.211 - - 0.208 2.1 613 0.108 0.197 - - 0.205 - - 0.199
Table 3. Performance indices of 152/734 nm bimodal aerosol inversion results
View tableTable 3. Performance indices of 152/734 nm bimodal aerosol inversion results
Velocity /(m·s－1) 0 10－5 10－3 P /nm EP EF P /nm EP EF P /nm EP EF 0 127/684 0.164/0.068 0.139 127/692 0.164/0.057 0.124 93/601 0.388/0.181 0.321 0.3 118/667 0.224/0.091 0.169 127/667 0.164/0.091 0.155 77/559 0.493/0.238 0.318 0.6 110/617 0.276/0.159 0.221 110/601 0.276/0.181 0.212 60/509 0.605/0.307 0.306 0.9 93/568 0.388/0.226 0.197 93/543 0.388/0.260 0.199 60/484 0.605/0.341 0.261 1.2 77/518 0.507/0.294 0.176 77/501 0.493/0.317 0.176 -/434 -/0.409 0.229 1.5 85/501 0.441/0.317 0.175 77/501 0.493/0.317 0.179 -/401 -/0.454 0.258 1.8 69/435 0.546/0.407 0.180 69/451 0.546/0.386 0.179 -/376 -/0.488 0.257 2.1 69/360 0.546/0.510 0.176 -/326 -/0.556 0.174 -/360 -/0.510 0.258
Table 4. Performance indices of aerosol inversion at different flow velocities
View tableTable 4. Performance indices of aerosol inversion at different flow velocities
Velocity /(m·s－1) P /nm EP0 EF0 0 143/742 0.000/0.000 0.000 0.5 102/667 0.287/0.101 0.099 0.7 85/534 0.406/0.280 0.167 1.1 35/- 0.755/- 0.154
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Tongtong Mu, Jin Shen, Xinqiang Li, Mengjie Wang, Yajing Wang, Wei Liu, Xi Yuan, Xiaohu Chen, Xinjun Zhu. Velocity Limitation in Dynamic Light Scattering Measurement for Flowing Aerosols[J]. Acta Optica Sinica, 2021, 41(14): 1429001
Paper Information
Category: Scattering
Received: Jan. 11, 2021
Accepted: Feb. 7, 2021
Published Online: Jul. 11, 2021
The Author Email: Shen Jin (shenjin@sdut.edu.cn)
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