Laser & Optoelectronics Progress, Volume. 57, Issue 23, 233004(2020)
Analytical Simulation of Ultraviolet Differential Absorption Spectra of Benzene, Toluene, and Xylenes
Figures & Tables(8)
Fig. 3. Variation of differential absorption coefficient with incident light intensity
Fig. 4. BTX concentrations retrieving. (a) No particles, no random noise (fitting residual with a standard deviation of 1.78×10-7 cm-1); (b) no particles, random noise (fitting residual with a standard deviation of 3.65×10-6 cm-1); (c) particles, no random noise (fitting residual with a standard deviation of 1.18×10-6 cm-1); (d) particles, random noise (fitting residual with a standard deviation of 4.83×10-6 cm-1)
Fig. 5. Variations of differential absorption coefficient in the absence of particles and the change of particle parameters
Table 1. Initial parameters setting for DOAS numerical simulation
View tableTable 1. Initial parameters setting for DOAS numerical simulation
Parameter Setting value Incident light intensity Deuterium light emitting spectrum Volume fraction of benzene/10-6 20 Volume fraction of toluene/10-6 40 Volume fraction of o-xylene/10-6 50 Volume fraction of m-xylene/10-6 60 Volume fraction of p-xylene/10-6 30 Light path length/cm 30 Particle number concentration (Nu)/(particle·cm-3) 105 Particle size range/nm 1-10000 Particle shape Sphere Particle size distribution Logarithmic normal distribution (Mu,Sd) Mean (Mu) 7 Standard deviation (Sd) 1 Relative refractive index of particles (m) 1.57 Light scattering condition Uncorrelated single scattering
Table 2. Influence of variation of incident light intensity on retrieved concentrations of BTX
View tableTable 2. Influence of variation of incident light intensity on retrieved concentrations of BTX
Species True volume fraction/10-6 Retrieved volume fraction/10-6 1.1I0(λ) I0(λ) 0.9I0(λ) 0.5I0(λ) 0.1I0(λ) Benzene 20 19.99 19.99 19.99 19.98 19.99 Toluene 40 39.95 39.96 39.95 39.92 39.96 O-xylene 50 49.55 49.55 49.55 49.57 49.55 M-xylene 60 59.48 59.52 59.54 59.58 59.52 P-xylene 30 30.02 30.01 30.01 30.03 30.01
Table 3. Effects of particle parameters on retrieved concentrations of BTX
View tableTable 3. Effects of particle parameters on retrieved concentrations of BTX
Species True volume fraction/10-6 Retrieved volume fraction/10-6 No particles Mu=6 Mu=4 Sd=0.5 Sd=1.2 Nu=104 m=1.33 Benzene 20 20.00 20.00 20.00 20.00 20.02 20.00 20.00 Toluene 40 40.01 40.02 40.00 39.99 40.04 39.99 40.00 O-xylene 50 50.00 50.09 49.99 49.98 50.24 49.97 50.01 M-xylene 60 60.03 59.96 60.01 59.99 60.35 60.00 59.97 P-xylene 30 30.00 30.00 30.00 30.00 29.97 30.00 30.00
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Xiangru Wang, Xiaoshu Cai, Jun Chen, Wu Zhou. Analytical Simulation of Ultraviolet Differential Absorption Spectra of Benzene, Toluene, and Xylenes[J]. Laser & Optoelectronics Progress, 2020, 57(23): 233004
Paper Information
Category: Spectroscopy
Received: Apr. 24, 2020
Accepted: May. 15, 2020
Published Online: Dec. 7, 2020
The Author Email: Cai Xiaoshu (usst_caixs@163.com)
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