Phase-diverse speckle imaging validity experiments

Wang Zhichen; Wang Bin; Liang Jing; Sun Jiming

Phase-Diverse Speckle (PDS) method integrates two image restoration methods of Phase Diversity (PD) and speckle imaging. PD method collects focused image and defocused image of known phase diverse at the same time, then target image is restored and wave-front phase is calculated. PDS technique extends PD by calculating the wave-front distortion of a series of short-expose frames to restore the images. Each frame is composed of two images with one in focus and the other defocus. To validate PDS method, experiments indoor and outdoor were carried out in the paper. The deformable mirror was used to simulate optics aberration in lab, and the single CCD collected focused image and defocused image at different time by shifting accurate translation stage. The resolution of restored image increased 12% compared with origin image. Outdoor experiment was also carried out. The cube beam splitter was used to divide the beam into two ways, one for focused CCD and the other for defocused CCD, and cameras were externally triggered to collect short-expose images at the same time. Images of target which was 20 kilometers away were collected, and image resolution was obviously improved by single-frame recovery and multi-frame recovery. Experiments confirm that PDS method can be widely used for optics equipments in shooting range and large aperture ground-based telescopes.

1. Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;

2. Northeast Normal University,School of Mathematics and Statistics,Changchun 130000,China

Received Date: 2013-04-10

Rev Recd Date: 2013-05-18

Publish Date: 2013-12-25

Key words:

Abstract: Phase-Diverse Speckle (PDS) method integrates two image restoration methods of Phase Diversity (PD) and speckle imaging. PD method collects focused image and defocused image of known phase diverse at the same time, then target image is restored and wave-front phase is calculated. PDS technique extends PD by calculating the wave-front distortion of a series of short-expose frames to restore the images. Each frame is composed of two images with one in focus and the other defocus. To validate PDS method, experiments indoor and outdoor were carried out in the paper. The deformable mirror was used to simulate optics aberration in lab, and the single CCD collected focused image and defocused image at different time by shifting accurate translation stage. The resolution of restored image increased 12% compared with origin image. Outdoor experiment was also carried out. The cube beam splitter was used to divide the beam into two ways, one for focused CCD and the other for defocused CCD, and cameras were externally triggered to collect short-expose images at the same time. Images of target which was 20 kilometers away were collected, and image resolution was obviously improved by single-frame recovery and multi-frame recovery. Experiments confirm that PDS method can be widely used for optics equipments in shooting range and large aperture ground-based telescopes.

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Reference (25)

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Phase-diverse speckle imaging validity experiments

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