Acta Optica Sinica, Volume. 43, Issue 15, 1511004(2023)
Multispectral Polarization Visually Assisted Optical Imaging Technology under Harsh Conditions
Figures & Tables(22)
Fig. 1. Demonstration interface in the Monte Carlo polarization transmission simulation software
Fig. 3. Environmental simulation device. (a) Atmosphere turbulence simulation device; (b) smog simulation device; (c) seawater simulation device
Fig. 5. Regulation characteristics of polarization selective transmission spectra of micro/nano line grids. (a) Periodic modulation characteristics; (b) grid thickness modulation characteristics; (c) duty cycle regulation characteristics; (d) angle regulation characteristics
Fig. 6. SEM images of micro-polarizer arrays. (a) Global image; (b) localized enlargement image
Fig. 9. Two-dimensional structures of visible light optical systems. (a) dEFL=18 mm, F=5.6; (b) dEFL=50 mm, F=4.5;(c) dEFL=90 mm, F=2.8
Fig. 10. Two-dimensional structures of short-wave infrared optical system. (a) dEFL=18 mm, F=2.8; (b) dEFL=50 mm, F=4.5;(c) dEFL=90 mm, F=5.6
Fig. 11. Two-dimensional structures of long-wave infrared optical system. (a) dEFL=18 mm, F=1.2; (b) dEFL=50 mm, F=1.2; (c) dEFL=90 mm, F=1.2
Fig. 12. MTF curves of visible light optical systems under different effective focal length. (a) dEFL=90 mm; (b) dEFL=50 mm; (c) dEFL=18 mm
Fig. 13. MTF curves of short-wave infrared optical systems under different effective focal length. (a) dEFL=18 mm; (b) dEFL=50 mm; (c) dEFL=90 mm
Fig. 14. MTF curves of long-wave infrared optical systems under different effective focal length. (a) dEFL=18 mm; (b) dEFL=50 mm; (c) dEFL=90 mm
Fig. 15. Polarization imaging experiment in haze environment. (a) Time-sharing polarization imaging device; (b) simultaneous polarization imaging device; (c) normal intensity imaging versus visible light polarization imaging; (d) normal intensity imaging versus short-wave infrared polarization imaging; (e) normal intensity imaging versus long-wave infrared polarization imaging
Fig. 17. Semantic segmentation verification based on multidimensional polarization information fusion
Fig. 19. Comparison results of different fusion methods. (a) Mobile phone screen as polarized light scene; (b) camouflage scene of outdoor trees
Table 1. Typical multispectral polarization imaging instruments in foreign countries
View tableTable 1. Typical multispectral polarization imaging instruments in foreign countries
Type Working principle Time Unit Spectral range /μm Polarization component Rotating polarizer type Select different polarizer sequences using motor rotation 2001 U.S. Air Force Laboratory 0.4-0.8 3 Sound and light adjustable filter type［ 15 -16 ］AOTF ±1 level diffraction polarization spectroscopy 2014 U.S. Army Laboratory 1.0-1.6 4
Liquid crystal type Bit phase modulation（LCVR）or spectroscopy（LCTF）via liquid crystal 2018 Polaris Sensor Technologies，Inc. 1.5-1.8 3 Split amplitude type Dividing the incident light path into four beams，multiple CCD detection 2007 Bulgarian Academy of Sciences 0.52-0.75 4 Grating dispersion type According to the grating anisotropic polarization spectroscopy characteristics，the separation of ±1 level diffracted light in S3 2010 University of Northern California，USA 0.5-0.7 4 Channel modulation type Modulate the polarization information to different channels and reconstruct the polarization information by demodulation 2014 University of Arizona，USA 0.4-0.85 4 Split-aperture type Split-aperture type optical imaging system with polarization modulation of different areas of the aperture 2020 Fuji Film Corporation，Japan 0.47-0.84 3 Bifocal plane type Micro and nano wire grid arrays 2016 Japan SONY Corporation 0.4-0.7 3
Table 2. Typical multispectral polarization imaging instruments in China
View tableTable 2. Typical multispectral polarization imaging instruments in China
Type Working principle Time Unit Spectral range /μm Polarization component Sound and light adjustable filter type AOTF ±1 level diffraction polarization spectroscopy 2018 Army Artillery and Air Defense Academy［ 17 ］0.45-0.95 3 Liquid crystal type Bit phase modulation（LCVR）or spectroscopy（LCTF）via liquid crystal 2016 Northwestern Polytechnic University 0.4-1 3 Split amplitude type Dividing the incident light path into four beams，multiple CCD detection 2015 Northwestern Polytechnic University 0.45-0.7 3 Grating dispersion type According to the grating anisotropic polarization spectroscopy characteristics，the separation of ±1 level diffracted light in S3 2017 Lanzhou Institute of Space Technology 0.4-1.0 3 Channel modulation type Modulate the polarization information to different channels and reconstruct the polarization information by demodulation 2017 Nanjing University of Science and Technology 0.45-0.7 3 Split-aperture type Split-aperture optical imaging system for different areas of the aperture
Perform polarization modulation
2017 Xi'an Institute of Optics and Mechanics，Chinese Academy of Sciences 0.4-0.75 4 Bifocal plane type Micro-nano gridded arrays 2021 Huazhong University of Science and Technology 0.532，0.81，1.55 4
Table 3. Indicators of visible light, short-wave infrared, and long-wave infrared polarization imaging systems
View tableTable 3. Indicators of visible light, short-wave infrared, and long-wave infrared polarization imaging systems
System Visible light system Short-wave infrared system Long-wave infrared system Operating wavelength /μm 0.45-0.78 0.9-1.7 8-12 Detector size /μm 3.45 20 17 Detector resolution /（pixel×pixel） 2048×2048 640×512 640×512 Focal length /mm 18-90 18-90 300 F-number 2.8-5.6 2.8-5.6 1.2
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Qiang Fu, Juntong Zhan, Su Zhang, Jin Duan, Jingping Zhu, Liqing Huang, Haodong Shi, Yingchao Li, Huilin Jiang. Multispectral Polarization Visually Assisted Optical Imaging Technology under Harsh Conditions[J]. Acta Optica Sinica, 2023, 43(15): 1511004
Paper Information
Category: Imaging Systems
Received: May. 10, 2023
Accepted: Jul. 31, 2023
Published Online: Aug. 15, 2023
The Author Email: Fu Qiang (fuqiang@cust.edu.cn), Jiang Huilin (hljiang@bit.edu.cn)
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