Device and method for measuring atmospheric turbulence intensity profile by receiving laser beacon

Abstract

The invention discloses a method and a method for measuring an atmospheric turbulence intensity profile by receiving a laser beacon. The device comprises a flat reflecting mirror for receiving backwards scattered lights of the laser beacon and reflecting received light beams to an off-axis type receiving telescope; lights received by the receiving telescope are reflected by a triangular prism and then enter into a following light path; the following light path splits the light beams and transmits the split light beams to a photoelectric detector; the photoelectric detector images the received light beams and converts light signals into electric signals; the electric signals are subjected to acquisition and conversion of a data acquisition and processing unit, and are converted into digital signals; after the laser beacon images at different distances in the space are processed, the atmospheric turbulence intensity profile can be calculated. The advantages of the method and method for measuring the atmospheric turbulence intensity profile by receiving the laser beacon are that the measurement time is not limited, the range resolution is high, and the obtained data are more genuine and more believable as a spherical wave based calculation method is adopted and a slope matrix is constructed to reflect the atmospheric turbulence intensity.

Description

technical field [0001] The invention belongs to the technical field of optical measuring instruments, and relates to a device and a method for receiving laser beacons and measuring atmospheric turbulence intensity profiles. Background technique [0002] When the laser beam is transmitted in the atmosphere, the fluctuation of the atmospheric refractive index caused by the fluctuation of the atmospheric density will cause the beam transmitted in it to produce beam drift, beam expansion, light intensity flicker, phase fluctuation and other effects, destroying the coherence of the laser beam, seriously Affects the propagation quality of the beam. In atmospheric optics research, the atmospheric turbulence intensity C n 2 It is a basic parameter to characterize the characteristics of atmospheric turbulence. The measured atmospheric turbulence intensity profile can describe the details of the turbulence in the atmosphere finely, thus providing basic parameters for the study of l...

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Problems solved by technology

The temperature pulsation instrument sounding method uses the sounding balloon to hang the temperature pulsation instrument for sounding measurement. This method has high spatial resolution, but because the balloon is affected by the wind, the measurement path is not controlled. In addition, the measurement of a profile The line time is also longer

Microwave radar calculates the intensity of atmospheric turbulence by measuring the backscattering power of the radar signal, but it needs to provide the temperature and humidity on the path, which is time-consuming, and the influence of humidity on the measurement is difficult to deduct, so the accuracy is not high

The measurement principle of sodar is similar to that of microwave radar, but because sound waves are mechanical waves, they can only measure the atmospheric boundary layer, and due to the limitation of sound power, the measurement height is limited

The SCIDAR method obtains the intensity profile of atmospheric turbulence by detecting the correlation of light intensity or phase distribution on a certain area, but requires two light sources separated by a certain distance as beacons, the requirements for beacons are more stringent, and the telescope aperture is required to be larger. Generally above 1m, which brings great restrictions to its application

MASS is a low-resolution atmospheric turbulence intensity profile measurement device, which can only give atmospheric turbulence intensity values ​​at 6 to 7 heights, with low spatial resolution

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