Real-time air turbulence calibration of large aperture camera image quality measurement system

Shangkuo Liu; Kai Liu; Zhengfeng Wang; Kewei E; Tao Wang; Yan Zhou; Jianke Zhao; Baoli Yao

doi:10.1117/12.2638454

15 November 2022 Real-time air turbulence calibration of large aperture camera image quality measurement system

Shangkuo Liu, Kai Liu, Zhengfeng Wang, Kewei E, Tao Wang, Yan Zhou, Jianke Zhao, Baoli Yao

Proceedings Volume 12448, 5th Optics Young Scientist Summit (OYSS 2022); 124481D (2022) https://doi.org/10.1117/12.2638454
Event: 5th Optics Young Scientist Summit (OYSS 2022), 2022, Fuzhou, China

Abstract

When measuring image qualities of large aperture cameras, many factors like people moving around, blowing of air conditioners outlets, thermal convection, etc., will give rise to air turbulence (AT). AT mainly induces non-uniform distribution of air components in the image chain of large aperture camera image quality measurement systems, which will lead to variations of system wavefront errors. Thus, AT will introduce errors to measurement results of traditional image quality evaluation methods. Those errors increase with the camera aperture and are usually time-varying. This paper proposes a method to calibrate AT in real time when measuring image qualities of large aperture cameras. A defocused star point target (DSPT) is added to traditional test targets (TTT). The camera under test can capture images of TTT and DSPT simultaneously. The distance between the effective area of TTT and the DSPT is carefully designed so that the corresponding images do not overlap with each other. We calibrate AT induced wavefront errors by processing the DSPT images with phase retrieval method. Experimental results of AT induced wavefront errors calibrated by the proposed method are presented.

Citation Download Citation

Shangkuo Liu, Kai Liu, Zhengfeng Wang, Kewei E, Tao Wang, Yan Zhou, Jianke Zhao, and Baoli Yao "Real-time air turbulence calibration of large aperture camera image quality measurement system", Proc. SPIE 12448, 5th Optics Young Scientist Summit (OYSS 2022), 124481D (15 November 2022); https://doi.org/10.1117/12.2638454

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