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Stratified atmospheric turbulence intensity measurement method based on total atmospheric coherence length constraint

A technology of atmospheric coherence length and atmospheric turbulence, applied in the field of atmospheric optics, can solve problems such as insufficient signal-to-noise ratio, influence on system parameters, underestimation, etc., and achieve the effect of improving layered measurement accuracy, system signal-to-noise ratio, and measurement accuracy

Active Publication Date: 2018-04-20
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, this S-DIMM+ method has insufficient signal-to-noise ratio, which will significantly underestimate the turbulence in the upper turbulent layer, which is manifested as the local atmospheric coherence length r in the upper turbulent layer 0 (h n ) will be significantly greater than the theoretical value, or even become infinite, that is, this method may not even be able to measure the high-level turbulent layer
This defect will lead to an unrealistic atmospheric turbulence profile obtained by the method, which further affects system parameters, including: conjugate height of mirrors in multilayer conjugate adaptive optics system, system servo bandwidth and wavefront reconstruction Algorithms, etc., which will restrict the functioning of the MCAO system

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  • Stratified atmospheric turbulence intensity measurement method based on total atmospheric coherence length constraint
  • Stratified atmospheric turbulence intensity measurement method based on total atmospheric coherence length constraint
  • Stratified atmospheric turbulence intensity measurement method based on total atmospheric coherence length constraint

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] The specific embodiment is the 1-meter solar telescope (NVST) of the Yunnan Astronomical Observatory of the Chinese Academy of Sciences and the prototype of the ground layer adaptive optics (GLAO), which is equipped with a 37-unit large field of view Shack-Hartmann wavefront sensor, figure 2 The sub-aperture layout diagram of the sensor is shown. The number of effective sub-apertures is 30, and the sensor can detect 7 layers of atmospheric turbulence. The embodiment collects sunspot images with a frame frequency of 100 Hz and a frame number of 500. The steps of embodiment are:

[0047] (1) Record 500 consecutive frames of large-field Shack-Hartmann wavefront sensor images, the number of wavefront sensor sub-apertures across the pupil diameter of the telescope is N=7, and the wavefront sensor sub-aperture diameter D=0.14m.

[0048] (2)...

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Abstract

The invention discloses a stratified atmospheric turbulence intensity measurement method based on a total atmospheric coherence length constraint. The method takes subaperture slopes of multiple targets obtained by a large-field-of-view Shack-Hartmann wavefront sensor as the input and the atmospheric total coherence length measured by a total coherence length measurement device is used as a constraint to obtain a stratified atmospheric turbulence intensity parameter. The method can make up for the deficiency of underestimation of the turbulence intensity in the upper atmosphere due to the traditional solar differential image motion monitor plus (S-DIMM+) method, and improve the measurement precision of the stratified atmospheric turbulence intensity parameter.

Description

technical field [0001] The invention belongs to the technical field of atmospheric optics, and in particular relates to a method for measuring layered atmospheric turbulence intensity parameters based on the constraint of total atmospheric coherence length. Background technique [0002] Atmospheric Refractive Index Structural Constant for Distribution of Atmospheric Optical Turbulence with Atmospheric Vertical Height Characterization is also the core knowledge of multi-conjugate adaptive optics (Multi-Conjugate Adaptive Optics, MCAO), and it is also a key parameter to evaluate the quality of telescope sites. The measurement results can be used to optimize system parameters, including servo closed-loop bandwidth, wavefront reconstruction algorithm, and conjugate height of MCAO system mirrors. Atmospheric coherence length r 0 , is an important parameter to evaluate the characteristics of atmospheric turbulence, and the atmospheric refractive index structure constant Atmo...

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Application Information

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IPC IPC(8): G01W1/00G01N21/84
CPCG01N21/84G01W1/00Y02A90/10
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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