Atmospheric optical turbulence intensity measurement, evaluation and correction method and system

Abstract

The invention discloses an atmospheric optical turbulence intensity measurement, evaluation and correction method, and is applied to the technical field of atmospheric optical turbulence intensity measurement. The method comprises the following specific steps: sampling high-frequency sound imaginary temperature time series data in real time by adopting a high-precision ultrasonic anemograph, and preprocessing the sound imaginary temperature time series data, and obtaining atmospheric temperature time series data; converting two-point temperature difference of a time interval into space two-point temperature difference according to a preset sampling frequency value, a scale value of an inertia zone, statistical time and a wind speed average value in the statistical time, and measuring a temperature structure constant in real time by a single-point structure function method; and calculating a temperature structure constant value by a single-point spectrum method, and evaluating and correcting the temperature structure constant value obtained by the single-point structure function method from the value range of the spectrum power rate to obtain an accurate value of the temperature structure constant. A guarantee is provided for continuously obtaining accurate optical turbulence intensity for a long time all day long.

Description

technical field [0001] The invention relates to the technical field of turbulence intensity measurement, and more specifically relates to an atmospheric optical turbulence intensity measurement, evaluation and correction method and system based on an ultrasonic anemometer. Background technique [0002] The propagation of light waves through the atmosphere is affected by small-scale refractive index fluctuations, which cause beam spreading, spot jitter, and coherence degradation. We refer to the turbulence in which the change of the refractive index field is mainly caused by temperature fluctuations as optical turbulence. [0003] The intensity of atmospheric optical turbulence near the surface is usually measured with a temperature pulsation instrument. The temperature pulsation meter measurement method is that two micro-temperature probes with a certain distance (usually 1 meter) form the two arms of the Wheatstone bridge, and measure the temperature difference between two...

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Problems solved by technology

[0005] In view of this, the present invention provides a method for measuring, evaluating and correcting the intensity of atmospheric optical turbulence based on an ultrasonic anemometer. The measurement of the optical turbulence intensity near the ground by the existing temperature pulsation meter is easily limited by the influence of the environment. The ultrasonic anemometer measures the The virtual temperature cannot directly obtain the optical turbulence intensity. In order to solve the shortcomings in the background technology, the acoustic virtual temperature measured by the high-precision ultrasonic anemometer is used, and the air temperature is obtained by correcting the acoustic virtual temperature. Under the Taylor assumption, the air temperature time measured at a point in space is The sequence data is converted into two points in space through the temperature difference, which provides a guarantee for obtaining the optical turbulence intensity continuously for a long time in all weathers; at the same time, the value of the temperature structure constant is calculated by the single-point spectrum method, and the value range of the spectral power law is compared to The temperature structure constant value obtained by the single-point structure function method is evaluated and corrected to obtain the accurate value of the temperature structure constant

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