Measurement method based on multi-sub-aperture imaging for atmospheric isoplanatic angle
A measurement method, a technology of equal vignetting angles, which is applied in the field of vignetting angle measurement, and can solve the problems of measuring equal vignetting angles, different sub-aperture sizes, and inability to meet the requirements of equal vignetting angle measurement apertures, etc.
Active Publication Date: 2013-01-30
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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And because the optical system is different, the number and layout of the receiving aperture and the sub-aperture are different, and the size of the sub-aperture is also different, which usually cannot meet the requirements of the equal-halation angle measurement aperture.
Therefore, in the multi-subaperture imaging detector similar to the Hartmann wavefront sensor, the traditional star scintillation method cannot be directly used to measure the equihalation angle
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[0073] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0074] This embodiment is applied to the adaptive optics system of the 1.8-meter telescope, and a Hartmann wavefront detector with 128 effective sub-apertures is used. Its operation process is as figure 1 As shown, the specific steps are as follows:
[0075] (1) The effective sub-aperture of the Hartmann wavefront detector in this embodiment is 128, each sub-aperture is a square aperture with a size of 0.1316mx0.1316m, and the corresponding imaging CCD sub-area is a square area of 6x6 pixels. The frame frequency of the imaging CCD is 500Hz, and the imaging wavelength is 0.61μm;
[0076] (2) Determine the sub-aperture area for measuring the equi-halation angle, such as Figure 7 In one embodiment shown, the single sub-aperture selected by each black line frame is a measurement aperture, that is, each measurement aperture is a sq...
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The invention discloses a measurement method based on multi-sub-aperture imaging for an atmospheric isoplanatic angle. The atmospheric isoplanatic angle is determined by utilizing a multi-sub-aperture imaging principle and through combining with an optical scintillation effect measurement method in turbulent atmosphere. A stellar scintillation measurement method for the atmospheric isoplanatic angle with a square aperture and a calculation and correction factor of the isoplanatic angle when a circular aperture and the square aperture are under different aperture sizes are introduced, so that the method can be applicable to a multi-sub-aperture imaging system with circular and square sub apertures in different sizes. The method provided by the invention is simple in flow path, is easy to realize, can be directly applied to an optical system using the multi-sub-aperture imaging system as a detector, such as a self-adaptive optical system using a Hartmann wave-front detector as the detector; the same-optical-path and co-optical-axis measurement with the optical system is realized; the application range of a conventional method for measuring the isoplanatic angle by an optical scintillation effect is expanded; and the measurement error is decreased.
Description
technical field [0001] The invention relates to a method for measuring atmospheric equi-halation angles, in particular to an atmospheric equi-halation angle measurement method suitable for multi-sub-aperture imaging with circular and square sub-apertures of different sizes. Background technique [0002] Atmospheric turbulence is a non-uniform random medium. Light is transmitted in the turbulent atmosphere. Affected by the fluctuation of the atmospheric refractive index, the phase and amplitude of the light wave fluctuate randomly at the same time, resulting in wavefront distortion, light intensity flicker, and centroid drift. And a series of turbulence effects such as spot breaking. The equi-halo angle is one of the characteristic parameters characterizing the atmospheric turbulence, which describes the maximum angle related to the atmospheric turbulence in a certain conical region, that is, the distortion caused by the turbulence on the atmospheric path within the equi-halo...
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Login to View More IPC IPC(8): G01C1/00G01S17/89
Inventor 郑文佳李新阳鲜浩李梅
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI