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A Layered Measurement Method of Atmospheric Seeing with Increased Number of Layers

A measurement method and technology for seeing, applied in the field of atmospheric optics, can solve problems such as the limitation of the number of layers, the inability to accurately present the strong turbulent layer, and the small value of seeing, and achieve innovative and practical effects.

Active Publication Date: 2020-10-16
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, when using the Shack-Hartmann wavefront sensor to measure atmospheric seeing in layers, the number of layers will be limited by the size of the sub-aperture array of the wavefront sensor
For the wavefront sensor with a small number of sub-apertures, it will lead to sparse height nodes (that is, the height position of each layer of the atmosphere), which will lead to two obvious defects. One is that the results of layered measurements cannot accurately represent the highly turbulent layer The second is that if there is a strong turbulent layer at the height node that the wavefront sensor cannot detect, its turbulence intensity will be superimposed on the atmosphere layer at the height node that the wavefront sensor can detect, which will cause the atmospheric turbulence at these positions to be overestimated, that is, Get a smaller value of seeing

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  • A Layered Measurement Method of Atmospheric Seeing with Increased Number of Layers
  • A Layered Measurement Method of Atmospheric Seeing with Increased Number of Layers
  • A Layered Measurement Method of Atmospheric Seeing with Increased Number of Layers

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Embodiment Construction

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] The specific embodiment is a 7×7 large field of view Shack-Hartmann wavefront sensor (N=7), figure 2For the sub-aperture arrangement diagram of the sensor, the number of effective sub-apertures is 30. The continuous distribution of the atmosphere is generated by the Kolmogorov phase screen with infinite outer scale, the generated height is 0-13km, the interval of each layer is 1km, and the total atmospheric seeing is 10cm, where the parameters of each layer are As shown in Table 1:

[0034] Continuous distribution of atmospheric turbulence entered in Table 1

[0035] Altitude (km) Enter r0(cm) Weights(%) 0 28.46 17.5 1 31.21 15 2 34.82 12.5 3 39.81 10 4 47.31 7.5 5 60.34 5 6 91.46 2.5 7 91.46 2.5 8 91.46 2.5 9 60.34 5 10 47.31 7.5 11 60.34 5 12 60...

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Abstract

The invention discloses an atmospheric seeing stratified measuring method by increasing layering number. The method comprises that sub-aperture slopes of a plurality of targets obtained by a Shack-Hartmann wavefront sensor with a large field of view are used as input, local atmospheric seeing obtained by previous atmospheric seeing stratified measurement can be used as a constraint, atmospheric seeing in different altitude ranges is calculated iteratively, and a measured result of the atmospheric seeing along with altitude distribution is finally outputted. The method can overcome the limitation of the sub-aperture array of wavefront sensors on the layering number of the atmospheric seeing, and improves the shortcoming of overvaluation of the strong turbulent layer strength caused by sparse seeing layered nodes. At the same time, the method does not introduce new hardware, thereby being practical and innovative.

Description

technical field [0001] The invention belongs to the technical field of atmospheric optics, and in particular relates to a layered measurement method for atmospheric seeing that increases the number of layers. Background technique [0002] Atmospheric Refractive Index Structure Constant for Distribution of Atmospheric Optical Turbulence with Atmospheric Vertical Height Characterization is also the core knowledge of Multi-Conjugate Adaptive Optics (MCAO), and it is also a key parameter for evaluating the quality of telescope sites. Measurements can be used to optimize system parameters, including servo closed-loop bandwidth, wavefront reconstruction algorithms, and conjugate heights of MCAO system mirrors. atmospheric seeing 0 It is an important parameter to evaluate the characteristics of atmospheric turbulence, which is related to the atmospheric refractive index structure constant The functional relationship between is: [0003] [0004] Therefore, by discretizing...

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Application Information

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IPC IPC(8): G01N21/84
CPCG01N21/84
Inventor 王志勇饶长辉张兰强孔林鲍华郭有明饶学军钟立波朱磊
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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