Detection of Marine Targets Covered in Sun Glint Based on Mid-infrared Polarization

Yansong Li; Huijie Zhao; Na Li; Guorui Jia

doi:10.3788/CJL202249.1910004

Chinese Journal of Lasers, Volume. 49, Issue 19, 1910004(2022)

Detection of Marine Targets Covered in Sun Glint Based on Mid-infrared Polarization

Yansong Li¹, Huijie Zhao^1,2, Na Li^1,2、*, and Guorui Jia¹

¹Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, School of Instrumentation & Opto-Electronic Engineering, Beihang University, Beijing 100191, China

²Institute of Artificial Intelligence, Beihang University, Beijing 100191, China

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Figures & Tables(12)

Fig. 1. Schematic of detector receiving radiation from the sea surface target

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Fig. 2. Schematic of mid-infrared dual-polarizer detection system

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Fig. 3. Observation modes.(a) Single-polarizer observation mode; (b) dual-polarizer observation mode

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Fig. 4. Principle prototype of mid-infrared polarization detection system

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Fig. 5. Experimental scene images. (a) Experimental scene of long-distance with near Brewster observation angle; (b) experimental scene of short-distance with approximate horizontal observation angle

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Fig. 6. Observation images. (a) Infrared image without polarizer; (b) infrared image with single-polarizer observation mode；(c) infrared image with dual-polarizer observation mode

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Fig. 7. Result after pipeline filtering

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Fig. 8. Observation images. (a) Infrared image without polarizer; (b) infrared image with single-polarizer mode; (c) infrared image with dual-polarizer mode

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Fig. 9. Processed images. (a) Polarized image in optimal angle and dual-polarizer mode; (b) morphological filtering result

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Table 1. Performance parameters of mid-infrared dual-polarizer detection system

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Table 1. Performance parameters of mid-infrared dual-polarizer detection system

Performance index	Parameter value
Working band /μm	3－5
F number	2
Focal length /mm	100
Field of view	4.4°×5.5°
Number of pixels	320×256
Pixel size /(μm×μm)	30×30
Polarizer	CaF₂, extinction ratio is 200∶1, average transmittance is 88.6%

Table 2. Experimental results of long-distance detection scene with near Brewster angle
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Table 2. Experimental results of long-distance detection scene with near Brewster angle
Target Image contrast
Without polarizer Single-polarizer mode Dual-polarizer mode
Wooden boat (big) 0.12 0.63 0.65
Artificial boat (small) 0.08 0.61 0.18

Table 3. Experimental result in short-distance scene with approximate horizontal observation angle
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Table 3. Experimental result in short-distance scene with approximate horizontal observation angle
Target Image contrast
Without polarizer Single-polarizer mode Dual-polarizer mode
Artificial boat 0.09 0.15 0.68

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Yansong Li, Huijie Zhao, Na Li, Guorui Jia. Detection of Marine Targets Covered in Sun Glint Based on Mid-infrared Polarization[J]. Chinese Journal of Lasers, 2022, 49(19): 1910004

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Paper Information

Category: remote sensing and sensor

Received: May. 30, 2022

Accepted: Jul. 11, 2022

Published Online: Sep. 6, 2022

The Author Email: Li Na (lina_17@buaa.edu.cn)

DOI:10.3788/CJL202249.1910004

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Performance parameters of mid-infrared dual-polarizer detection system

Table 1. Performance parameters of mid-infrared dual-polarizer detection system

Table 2. Experimental results of long-distance detection scene with near Brewster angle

Table 2. Experimental results of long-distance detection scene with near Brewster angle

Table 3. Experimental result in short-distance scene with approximate horizontal observation angle

Table 3. Experimental result in short-distance scene with approximate horizontal observation angle