On the feasibility of using a laser guide star adaptive optics system in the daytime

Dungee, Ryan; Chun, Mark; Hayano, Yutaka

doi:10.1117/1.jatis.5.1.019002

Cited by 5 publications

(1 citation statement)

References 15 publications

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“…However, the skylight background is strong in the daytime, and it is easy to cover dim and weak targets, meaning daytime detection is always the weakness for the application of optical detection techniques (especially for ground-based equipment). To overcome the influence of the daytime skylight background, researchers have been exploring some methods to suppress the skylight background, mainly including the field of view (FOV) constraint [ 1 ], spectral filtering [ 2 , 3 , 4 ], polarization filtering [ 5 , 6 ], etc. However, these methods have their shortcomings.…”

Section: Introductionmentioning

confidence: 99%

New-Type Shearing Interference Detection System Based on Double-Grating Structure for Suppressing the Skylight Background

Dong,

Wang,

et al. 2023

Sensors

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To overcome the influence of the daytime skylight background on long-distance optical detection, a new type of shearing interference detection system was proposed to improve the detection performance of the traditional detection system for finding dark objects such as dim stars during the daytime. This article focuses on the basic principle and mathematical model as well as the simulation and experimental research of the new type of shearing interference detection system. The comparison of the detection performance between this new-type detection system and the traditional system is also carried out in this article. The experimental results show that the detection performance of the new type of shearing interference detection system is significantly better than that of the traditional system, and the image signal-to-noise ratio of this new-type system (about 13.2) is much higher than that of the best result of the traditional detection system (about 5.1).

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Section: Introductionmentioning

confidence: 99%

New-Type Shearing Interference Detection System Based on Double-Grating Structure for Suppressing the Skylight Background

Dong,

Wang,

et al. 2023

Sensors

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Research on the new detection method of suppressing the skylight background based on the shearing interference and the phase modulation

Liu

Wang

2020

Opt. Express

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In order to effectively suppress the effect of the skylight background on the detection performance of the optical telescope and make it have the advantages of the all-time operation and the high star-magnitude detection, a new detection method based on the shearing interference and the phase modulation is proposed in this paper. This method utilizes the discrepancy of the spatial coherence between the target (smaller size) and the skylight background (larger size). By adjusting the shearing amount reasonably, the target light can form the interference fringes, while the skylight background cannot. Then, the phase modulation technique is used to form the moving interference fringes over the detector. Afterward, the periodical electrical signal is formed by the photoelectrical conversion of the detector. Finally, the weak signal detection equipment can be used to extract the target signal from the skylight background noise. This paper introduces the scheme design and the theoretical analysis of the new detection method and also presents the detection performance simulation of this new method.

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Application of the Gaussian modeling algorithm to a Shack–Hartmann wavefront sensor for daylight adaptive optics

Wang

Yao

et al. 2021

Opt. Lett.

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Daytime use of Shack–Hartmann wavefront sensor (SHWS)-based adaptive optics (AO) at a telescope is hindered by the fluctuating bright sky background. Therefore, we propose a Gaussian modeling centroid extraction algorithm that performs real-time daylight AO closed-loop corrections. The algorithm is executed in the process of modeling and updating each pixel of the consecutive SHWS images. The simulation results show that our method can provide a lower centroid estimation error (CEE) for bright sky background conditions. We also performed a field experiment on a 2 m ground-based telescope and achieved a daylight AO correction of 2.1 times diffraction limit for a star with a visual magnitude of 4.7 (HIP113116) when the elevation angle of the sun was 7.7°. This represents the first publicly reported daylight natural guide star AO correction result on a 2 m class telescope.

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On the feasibility of using a laser guide star adaptive optics system in the daytime

Cited by 5 publications

References 15 publications

New-Type Shearing Interference Detection System Based on Double-Grating Structure for Suppressing the Skylight Background

New-Type Shearing Interference Detection System Based on Double-Grating Structure for Suppressing the Skylight Background

Research on the new detection method of suppressing the skylight background based on the shearing interference and the phase modulation

Application of the Gaussian modeling algorithm to a Shack–Hartmann wavefront sensor for daylight adaptive optics

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