Optical design for simultaneous polarization imager based on off-axis three-mirror

Mingchun, 凌明椿 Ling; Maoxin, 宋茂新 Song; Jin, 洪津 Hong; Xiaobing, 孙晓兵 Sun; Fei, 陶菲 Tao

doi:10.3788/irla201948.0518001

Cited by 4 publications

(1 citation statement)

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“…For example, it is suitable for stealth, camouflage, and false target detection and identification 1 , sea surface target detection and classification 2 , water surface ripple detection 3 , and it can improve target detection and recognition ability in harsh environments such as haze and smoke 4 . The high-resolution simultaneous polarization imager built by our research group obtains the full Stokes vector of the target, which is used for accurate target recognition 5 .…”

Section: Introductionmentioning

confidence: 99%

Stray light simulation and suppression of high-resolution simultaneous polarization imager

Zhao

Song

Ling

et al. 2023

First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023)

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A high-resolution simultaneous polarization imager based on off-axis three-mirror telescopic objective detects polarization information to enhance contrast and identify target. Stray light can increase system noise, reduce image contrast, and affect imaging quality. It is necessary to analyze and suppress stray light in order to ensure the polarization measurement accuracy of the instrument. The three-dimensional solid model and optical properties of the instrument were established by stray light analysis software Tracepro. The stray light of channel 1 was simulated and analyzed. The important surface of the system and the first-order stray light paths were found through forward trace and backward trace. The main baffle and vane, secondary mirror baffle and third mirror light barrier were designed by using CAD drawing software. Then the PST (Point Source Transmittance) curve of stray light is given under off-axis angle is within ± 50 °. When the off-axis angle is  30 °, PST is less than 10 -10 . The VGI (Veiling Glare Index) is 1.47%, which was obtained by fitting the PST curve and integrating. The influence of the VGI on the polarization accuracy was 0.020@p=0.3. The results show that the stray light suppression system have obvious effects, and the influence on the polarization accuracy is acceptable.

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Section: Introductionmentioning

confidence: 99%

Stray light simulation and suppression of high-resolution simultaneous polarization imager

Zhao

Song

Ling

et al. 2023

First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023)

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Recent Patents for Optical Alignment

Li,

2024

CCS

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Background: The installation of optical devices is a necessary operation before their use. Therefore, the configuration of the optical system affects the performance of the whole optical system. However, in the process of optical system installation, there are still some technical breakthroughs to be made in order to better carry out optical system installation in the future. Objective: Through the introduction and discussion of the devices, methods and patent features of optical alignment testing in recent years, some valuable conclusions are summarized, and future research and development are prospected. Methods: The patents of optical system assembly were studied, and the patents and research progress of optical alignment were summarized. Results: With the development of optical technology, optical alignment has become more and more important, so optical alignment is needed to realize the design of optical systems. Conclusion: It is concluded that there is still a large space for the development of optical alignment, and the main development trend is towards high precision and large caliber

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Multi-Band Polarization Imaging in a Harsh Sea Fog Environment

Liu

Guo

et al. 2022

Applied Sciences

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Researchers in many nations are focusing more on the growth and usage of the marine field, and it is apparent that study on the marine field will be the future development trend. The present study adopts the idea of polarization imaging based on liquid crystal phase retarder as a solution to the drawbacks of conventional industrial camera imaging clarity. Various optical thicknesses are employed to characterize the sea fog concentration; an outside optical imaging equipment is constructed for sea fog imaging research; and pictures comprising polarization characteristics may be determined through image processing. Using multi-band as factors, the benefit of polarization imaging in a sea fog environment is assessed objectively using contrast, information entropy, degree of polarization, and other evaluation indices. The results demonstrate that the quality of the polarization image is superior to that of the intensity image and that the outline of the target is more pronounced in the polarization image. Additionally, the polarization imaging effect is better in the 670 nm band, and the polarization contrast is increased by 1.9%. The contrast trend of the polarization picture is impacted by the time period, but it is roughly equivalent to that of the intensity image. This gives a solid platform for target surveys and civic operations under conditions of dense marine fog.

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Optical design for simultaneous polarization imager based on off-axis three-mirror

Cited by 4 publications

References 0 publications

Stray light simulation and suppression of high-resolution simultaneous polarization imager

Stray light simulation and suppression of high-resolution simultaneous polarization imager

Recent Patents for Optical Alignment

Multi-Band Polarization Imaging in a Harsh Sea Fog Environment

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