Infrared and Laser Engineering, Volume. 49, Issue 7, 20201023(2020)
Experimental study on extinction characteristics of aqueous foam(Invited)
Figures & Tables(29)
Fig. 5. Aqueous foam for measurement and foam cylinder for sampling
Fig. 9. Relation between infrared transmittance and time at different wavelengths
Fig. 10. Foam infrared extinction coefficient vs wavelength diagram
Fig. 12. Extinction performance test system for laser（1.06, 10.6 μm）
Fig. 13. Attenuation curves of different thickness foam with different bubble size distributions of 4−7 mm to 1.06 μm laser
Fig. 14. Attenuation curves of different thickness foam with bubble size distributions of 4−7 mm to 10.6 μm laser
Fig. 15. Testing system for attenuation characteristics of foam to mm wave
Fig. 17. Attenuation effect with thickness of 80 cm to 8 mm wave（foam bubble size distribution of 2-3.5 cm）
Fig. 18. Attenuation effect with thickness of 80 cm to 8 mm wave（foam bubble size distribution of 0.8-2 cm）
Fig. 19. Schematic diagram of measurement system for centimeter-wave attenuation characteristics
Fig. 20. Attenuation effect with thickness of 20 cm to 2, 3 cm centimeter-wave
Fig. 21. Attenuation effect with thickness of 60 cm to 2, 3 cm centimeter-wave
Fig. 22. Attenuation effect with thickness of 80 cm to 2, 3 cm centimeter-wave
Table 1. Transmittance of different thickness of foams
View tableView in ArticleTable 1. Transmittance of different thickness of foams
Thickness of foams camouflage effect Thickness / cm 12 13 14 15 20 5.27% 3.51% 2.56% 1.83% 0 5.35% 3.21% 1.93% 0.59% 0
Table 2. Infrared extinction coefficient of foam on un-cooling focal plane thermal image with SAT-HY6800
View tableView in ArticleTable 2. Infrared extinction coefficient of foam on un-cooling focal plane thermal image with SAT-HY6800
Background 295.29 317.22 — — — — — Sample 1 295.29 317.22 294.82 291.01 11.94 0.35 0.451 Sample 2 295.29 317.22 295.03 290.81 10.83 0.41 0.402 Sample 3 295.29 317.22 301.56 304.47 12.03 0.38 0.449 Sample 4 295.29 317.22 302.61 306.53 11.78 0.35 0.422 Sample 5 295.29 317.22 302.29 296.92 11.05 0.31 0.430 Avg.=0.431
Table 3. Average transmittance of laser with different thickness of foam bubble size distribution of 4−7 mm
View tableView in ArticleTable 3. Average transmittance of laser with different thickness of foam bubble size distribution of 4−7 mm
Thickness/cm 1 2 5 7 10 1.06 μm transmittance 57.25% 47.03% 26.23% 12.00% 6.02% 10.6 μm transmittance 61.97% 52.98% 41.63% 23.04% 7.63%
Table 4. Average transmittance of laser with thickness of 10 cm different foam bubble size distributions(1.06 μm,10.6 μm)
View tableView in ArticleTable 4. Average transmittance of laser with thickness of 10 cm different foam bubble size distributions(1.06 μm,10.6 μm)
Foam bubble size 1.3−2.5 cm 4−7 mm 0.8−2 mm 1.06 μm transmittance 17.86% 6.02% 0 10.6 μm transmittance 48.98% 7.63% 0
Table 5. Test results of 3 mm millimeter-wave with thickness of 20 cm foams
View tableView in ArticleTable 5. Test results of 3 mm millimeter-wave with thickness of 20 cm foams
Category Min Max Avg Attenuation decibels / dB 16.08 13.82 14.93 Transmittance 2.47% 4.15% 3.21%
Table 6. Test results of 2, 3 cm centimeter-wave with different thickness foams
View tableView in ArticleTable 6. Test results of 2, 3 cm centimeter-wave with different thickness foams
Thickness /cm 2 cm/dB Result of 2 cm 3 cm /dB Result of 3 cm 20 2.3 16.8% 8.5 42.5% 60 12.5 81.2% 17.4 92.3% 80 29.9 100% 18.1 90.5%
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Gongpei Pan, Xuefeng Du, Jun Zhao. Experimental study on extinction characteristics of aqueous foam(Invited)[J]. Infrared and Laser Engineering, 2020, 49(7): 20201023
Paper Information
Category: Special issue on infrared extinction technology
Received: Mar. 10, 2020
Accepted: --
Published Online: Aug. 19, 2020
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