Optical synthetic aperture imaging in diffuse reflection with a wide field, high resolution, and high signal-to-noise ratio

Sheng Li; Yan Zou; Bowen Wang

doi:10.1117/12.2663723

12 April 2023 Optical synthetic aperture imaging in diffuse reflection with a wide field, high resolution, and high signal-to-noise ratio

Sheng Li, Yan Zou, Bowen Wang

Author Affiliations +

Proceedings Volume 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022); 125653V (2023) https://doi.org/10.1117/12.2663723
Event: Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 2022, Shanghai, China

Abstract

Optical synthetic aperture combines the idea of aperture synthesis, which enables the synthesis of multiple low- resolution images in the frequency domain to achieve large field-of-view and high-resolution imaging results. However, due to the roughness of the target, there is a laser speckle that greatly affects the quality of imaging. This is due to the phase disorder formed by the reection of coherent light from a rough surface. The speckle size is inversely proportional to the optical aperture size, The Fourier ptychography is a promising computational imaging technology to reconstruct the wide-field, high-resolution image, however, it cannot eliminate the effect of laser speckle, but can only reduce the size of the speckle in equal proportion to the size of the synthetic aperture. We propose an optical synthetic aperture system that is able to reduce the effect of laser speckle. We use the non-correlation degree of different speckles to illuminate the same target in the far field with multiple angles and aperture scanning to achieve different speckles at the same resolution. Then the image sequences with different speckles are reconstructed separately to obtain the results, and then the non-correlated speckle images are averaged over multiple frames to obtain high signal-to-noise ratio results with the help of the method to eliminate the effect of speckles in holographic imaging. The experimental results show that our method can significantly improve imaging effciency and achieve super-resolution far-field imaging with a high signal-to-noise ratio. This is expected to provide powerful support in the field of remote sensing, and military reconnaissance, and also provides new directions and ideas for far-field detection technology.

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Sheng Li, Yan Zou, and Bowen Wang "Optical synthetic aperture imaging in diffuse reflection with a wide field, high resolution, and high signal-to-noise ratio", Proc. SPIE 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 125653V (12 April 2023); https://doi.org/10.1117/12.2663723

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KEYWORDS

Speckle

Image resolution

Reflection

Signal to noise ratio

Specular reflections

Image restoration

Imaging systems

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