A three-parameter comprehensive measurement method of optical turbulence in the whole layer of atmosphere

Abstract

The invention discloses a method for comprehensively measuring three parameters of the optical turbulence of the whole-layer atmospheric. The method comprises the following steps of 1, selecting a telescope with a caliber of 300mm or above to receive the parallel light passing through the whole layer of atmosphere; 2, on the basis of an existing atmospheric coherence length and isoplanatic angle two-parameter measuring instrument, receiving all light intensities on an unutilized pupil area (in order to describe conveniently, the area of the pupil area is called R for short) of the telescope byutilizing a detector; and 3, calculating the light intensity fluctuation variance on the clear aperture of the whole telescope by combining the light intensity data in the sub-holes of the two-parameter measuring instrument to obtain an inclined isoplanatic angle, namely a third parameter. The three parameters of the atmospheric coherence length, the isoplanatic angle and the inclined isoplanaticangle can be continuously measured in real time, and the three parameters of turbulence can be simultaneously measured by one instrument for the first time; the third parameter is measured on the basis of the existing two-parameter measuring instrument, and the instrument is little in modification, is easy to achieve, can be utilized fully and is high in cost performance.

Description

technical field [0001] The invention belongs to the technical field of light wave atmospheric transmission, and in particular relates to a method for comprehensively measuring three parameters of optical turbulence in the entire layer of atmosphere. Background technique [0002] m-order turbulent moment (μ m ) is defined as the integral of the refractive index structure constant on the turbulent path, where the path weight function is the mth power of the path position variable z, namely L is the propagation distance of light on the turbulent path. At present, the two most used turbulence moments in the evaluation of turbulence effects are the 0th order moment μ 0 and the 5 / 3 moment μ 5 / 3 , respectively corresponding to the atmospheric coherence length r measured in astronomical siting 0 and equal halo angle θ 0 . In fact, there is still an important turbulent moment that has not been utilized, that is, the turbulent second-order moment μ 2 , which corresponds to the...

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Problems solved by technology

Existing atmospheric coherence length and equal halo angle two-parameter measuring instrument (referred to as the two-parameter measuring instrument in this text) adopts a telescope (catadioptric type with a secondary mirror in the middle) with a diameter of 300 mm or more, and two photonic holes are opened at its front end. DIMM principle measurement r 0 , measuring θ by stellar scintillation method 0 ; but can measure r at the same time 0 , θ 0 and θ TΑ The three-parameter instrument has not been reported

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