Laser & Optoelectronics Progress, Volume. 55, Issue 3, 031104(2018)
Design of Hyperspectral Polarization Imaging System with Multiple Simultaneous Apertures Based on Orthogonal Dual-Polarization
Figures & Tables(16)
Fig. 1. (a) Physical map and (b) outdoor experiment map of hyperspectral polarization imaging system with multiple simultaneous apertures
Fig. 2. (a) Main field location and (b) design scheme block diagram of hyperspectral polarization imaging system with multiple simultaneous apertures
Fig. 4. Light paths of optical sysytem. (a) Simple plane design drawing; (b) three-dimensional design drawing
Fig. 7. Mechanical design of hyperspectral polarization imaging system with multiple simultaneous apertures. (a) Overall configuration diagram; (b) optical cavity and CCD camera; (c) electronics control box
Fig. 8. Three kinds of camouflage net samples used in experiment. (a) Camouflage net 1; (b) camouflage net 2; (c) camouflage net 3
Fig. 11. Comparison of images of natural imaging and hyperspectral polarization imaging. (a) Image of natural imaging; intensity images at (b) 550 nm, (c) 640 nm and (d) 800 nm; polarization images at (e) 550 nm, (f) 640 nm and (g) 800 nm
Fig. 12. Relative reflectance curves of different surface objects. (a) Variation in relative reflectance of intensity with wavelength; (b) variation in relative reflectance of polarization with wavelength
Table 1. Main performance indexes of imaging system
View tableTable 1. Main performance indexes of imaging system
Item Main parameter and property Spectral range /nm 450-950 Spectral resolution /nm 2-8 Field angle /(°) 6 Polarization direction 0°, 60° and 120° Quantized value /bit 12 Frame frequency / (frame·s-1) maximum 20 Detection range /km superior to 1 (fine weather) Imaging power /W 35.6 Standby power /W 6 Spectral switch elapsed time /ms 0.1 Focal length /mm 78 Clear aperture /mm×mm 8×8 Optical probe size / mm×mm×mm 260×220×240 Linear polarization range /nm 350-2300
Table 2. Main performance indexes of AOTF
View tableTable 2. Main performance indexes of AOTF
Item Main parameter and property Acousto-optic material TeO2 crystal Spectral range /nm 450-950 Spectral resolution /nm 2-8 Aperture angle /(°) >3.0 Separation angle /(°) >5.6 Clear aperture /mm 8×8 Diffraction efficiency >40% Drifting /(°) 0.006 Driving power /W <2.0
Table 3. Correlation coefficients of reflectance spectra of polarization parameters among different surface objects
View tableTable 3. Correlation coefficients of reflectance spectra of polarization parameters among different surface objects
Parameter Condition A1 A2 A3 B1 -0.9883 -0.9043 -0.8774 B2 -0.2859 -0.6094 -0.2676
Table 4. Experimental results under different weather conditions
View tableTable 4. Experimental results under different weather conditions
Time Weather Item A1 A2 A3 2017-09-07 15:02 Sunny B1 -0.9776 -0.9573 -0.9403 Sunny B2 -0.2609 -0.3195 -0.1736 2017-09-07 16:01 Sunny B1 -0.8880 -0.8395 -0.7954 Sunny B2 -0.2594 -0.1068 -0.0951 2017-09-07 17:01 Sunny B1 -0.8682 -0.3515 -0.2819 Sunny B2 -0.1782 -0.0324 -0.0976 2017-09-05 14:05 Cloudy B1 -0.8726 -0.1826 0.1031 Cloudy B2 -0.1058 -0.0872 -0.1211 2017-09-01 14:00 Overcast B1 -0.7848 -0.1259 0.1632 Overcast B2 -0.0325 -0.0146 -0.0982
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Xiaolong Wang, Feng Wang, Rui Xu, Xiao Liu, Hongwu Yuan. Design of Hyperspectral Polarization Imaging System with Multiple Simultaneous Apertures Based on Orthogonal Dual-Polarization[J]. Laser & Optoelectronics Progress, 2018, 55(3): 031104
Paper Information
Category: Imaging Systems
Received: Jul. 31, 2017
Accepted: --
Published Online: Sep. 10, 2018
The Author Email: Wang Xiaolong (wxlaiwoqin@163.com)
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