Device and method for measuring non-isoplanatism wave-front errors and turbulence characteristic parameters of atmosphere turbulence

Abstract

The invention provides a device and a method for measuring non-isoplanatism wave-front errors and turbulence characteristic parameters of an atmosphere turbulence. The method comprises the following steps: setting a beacon Hartmann sensor focusing distance according to a beacon mode; respectively receiving a target light wave imaging light spot pattern and a beacon light wave imaging light spot pattern by utilizing a target Hartmann sensor and a beacon Hartmann sensor; controlling a target Hartmann sensor CCD (Charge Coupled Device) and a beacon Hartmann sensor CCD to synchronously collect by an external synchronous triggering source; calculating an average slope of a time sequence target light wave and a beacon light wave in a sub-hole diameter of a micro-lens set, and carrying out difference operation by utilizing a wave-front processor; carrying out recovery on a difference average slope and a target light wave average slope and expanding a Zernike mode by utilizing a recovering algorithm to obtain counting characteristics including non-isoplanatism wave-front errors, target turbulence wave-front two-dimensional distribution, wave-front square errors, a P-V value, Zernike mode square errors, non-isoplanatism relative errors and the like, as well as the turbulence characteristic parameters including the coherence length, an isoplanatic angle, the beacon equivalent diameter and the like. The device and method disclosed by the invention have the advantages of high light energy utilization rate, small measurement errors and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of optical information measurement, and relates to a device and method for measuring atmospheric turbulent anisotropic wavefront errors and turbulent characteristic parameters, specifically measuring the atmospheric turbulent anisotropic wavefront errors and turbulence characteristic parameters based on a Hartmann sensor. A device and method for measuring turbulence characteristic parameters. Background technique [0002] The atmosphere is the basic channel for light wave transmission in many practical optical applications such as astronomical observation and laser atmospheric transmission. Due to the random fluctuation of atmospheric refractive index due to turbulent motion caused by factors such as human activities and solar radiation, the target light wave suffers severe wavefront distortion, which has become an important factor limiting the performance of practical optical systems. [0003] Adaptive Opt...

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Problems solved by technology

However, when measuring the coherence length of this method, it is necessary to use two telescope systems that are exactly the same and have specific requirements for the distance between the centers of the optical paths to receive differential star images; when measuring the equi-halo angle, it is required to control the receiving aperture of the system to meet the requirements of measuring starlight. Intensity fluctuation variance equal halo angle has equal height weight function, higher engineering requirements

At the same time, under certain conditions, although this method can be used to deduce the statistical variance of the angle non-uniform error, it cannot obtain the two-dimensional distribution information of the turbulent non-uniform wavefront error.

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