Acta Photonica Sinica, Volume. 53, Issue 1, 0112001(2024)
Oil Mist Concentration On-line Measurement by Optical Scintillation Method
Figures & Tables(20)
Fig. 2. The average particles number in monodisperse particle system different concentrations
Fig. 6. Spectral scanning results of lubricating oil droplets under different concentration gradients
Fig. 9. Transmitted light intensity signal under stable experimental conditions
Fig. 10. Transmitted light intensity signals at different flicker frequencies
Fig. 11. Transmitted light intensity signals at different flicker frequencies
Fig. 13. Oil mist droplet size frequency distribution in experiment
Fig. 15. Concentration test results of light scintillation and light transmission methods
Table 1. Physical parameters of lubricating oil
View tableView in ArticleTable 1. Physical parameters of lubricating oil
Parameter Value Method ISO viscosity classification 460 ISO 3448 Kinematic viscosity（40℃）/cSt 460 ASTM D445 Kinematic viscosity（100℃）/cSt 31 ASTM D445 Density（40℃）/（kg·m-3） 896 Viscosity index 95 ISO 2909 Refractive index 1.47 Abbe refractometer Flash point/℃ 260 ISO 2592
Table 2. Total variance explanation
View tableView in ArticleTable 2. Total variance explanation
Component Characteristic root Variance contribution rate/% Accumulated variance contribution rate/% 1 5.26 87.59 87.59 2 0.35 5.83 93.42 3 0.25 4.11 97.53 4 0.11 1.84 99.36 5 0.038 0.66 100
Table 3. The causes of light scintillation and the influencing factors of scintillation frequency
View tableView in ArticleTable 3. The causes of light scintillation and the influencing factors of scintillation frequency
Light scintillation causes Frequency influence Media level Temperature and pressure lead to fluctuations in the density of the medium，causing optical inhomogeneity of the medium The whole frequency，and influence of media density fluctuation frequency is drastic Medium velocity The high-frequency influence，gas velocity is positive correlated with the frequency Particles level Random enter of particles in light The low-frequency，it is related to the beam diameter and gas velocity Discontinuities of particle concentration The low-frequency，and it is lower than the frequency of the random enter of particles in light The interaction between particles and media Turbulence effect，the dual effect of gas velocity and particles due to turbulent movement of the medium The whole frequency，it is related to the turbulence intensity of the medium
Table 4. Operating conditions of light scintillation frequency experiment
View tableView in ArticleTable 4. Operating conditions of light scintillation frequency experiment
Particle D32=1 μm 20 v/（m·s-1） 2 D/mm 2 L/mm 400
Table 5. Experimental results of concentration calibration using scintillation and transmission methods
View tableView in ArticleTable 5. Experimental results of concentration calibration using scintillation and transmission methods
Calibration concentration/（mg·m-3） Intensity Intensity Variance
Scintillation concentration/（mg·m-3） Scintillation error/% %
Transmission concentration/（mg·m-3） Transmission error/% 4.8 1.5 156 1.5 148 0.000 322 4.5 6.3 0.05 0.6 88.4 5.2 1.5 132 0.000 334 5.4 3.8 0.16 1.7 67.9 6.7 1.5 008 0.000 387 7.1 6.0 0.99 10.3 54.1 8.9 1.5 148 0.000 425 8.2 7.9 0.05 0.6 93.8 9.4 1.4 999 0.000 498 9.3 1.1 1.05 11.0 16.5 10.5 1.5 025 0.000 708 9.6 8.6 0.87 9.1 13.0 12.9 1.5 102 0.001 101 12.7 1.6 0.36 3.8 70.9 13.7 1.4 854 0.000 921 13.0 5.1 2.03 21.2 54.6 15.8 1.4 985 0.001 006 14.5 8.2 1.14 11.9 24.4 17.9 1.4 895 0.001 253 18.9 5.6 1.75 18.3 2.1 19.6 1.4 802 0.001 472 20.6 5.4 2.39 24.9 26.9 20.8 1.4 785 0.001 456 20.5 1.4 2.51 26.1 25.4 22.9 1.4 799 0.001 603 24.8 8.3 2.41 25.1 9.5 23.6 1.4 811 0.001 700 21.5 8.9 2.33 24.2 2.6 24.8 1.4 811 0.001 536 25.9 4.4 2.33 24.2 2.3 26.8 1.4 785 0.001 876 27.6 3.0 2.51 26.1 2.7 28.4 1.4 765 0.001 988 25.7 9.5 2.65 27.5 3.2 29.3 1.4 705 0.002 242 31.2 3.4 3.07 31.8 8.5 31.1 1.4 698 0.002 211 32.2 3.5 3.12 32.3 3.8 33.5 1.4 685 0.002 245 31.2 6.9 3.21 33.2 0.9 35.6 1.4 625 0.002 592 39.1 9.8 3.63 37.5 5.4 37.9 1.4 601 0.002 653 37.1 2.1 3.80 39.2 3.6 39.6 1.4 585 0.002 787 42.5 7.3 3.91 40.4 2.0 40.5 1.4 545 0.003 035 39.5 2.5 4.20 43.3 6.9 41.8 1.4 501 0.003 211 39.5 5.5 4.52 46.5 11.2 42.9 1.4 526 0.003 003 45.6 6.3 4.34 44.7 4.1 43.6 1.4 511 0.003 313 46.5 6.7 4.44 45.8 4.9 45.9 1.4 498 0.002 952 43.5 5.2 4.54 46.7 1.7 47.2 1.4 485 0.003 304 45.1 4.4 4.63 47.6 0.9 49.5 1.4 398 0.003 465 52.3 5.7 5.26 54.0 9.0 50.2 1.4 385 0.003 411 54.1 7.8 5.36 54.9 9.4
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Guangyao LIN, Fei HU, Zhongli JI, Zhen LIU. Oil Mist Concentration On-line Measurement by Optical Scintillation Method[J]. Acta Photonica Sinica, 2024, 53(1): 0112001
Paper Information
Category: Instrumentation, Measurement and Metrology
Received: May. 19, 2023
Accepted: Sep. 15, 2023
Published Online: Feb. 1, 2024
The Author Email: JI Zhongli (jizhongli_63@126.com)
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