New method for real-time measuring optical turbulent flow intensity by ultrasonic anemometer

Abstract

The invention discloses a new method for real-time measuring optical turbulent flow intensity by an ultrasonic anemometer, comprising: measuring sound virtual temperature by a high precision ultrasonic anemometer, correcting the sound virtual temperature to obtain temperature, under the Taylor assume, and converting temperature time sequence data measured at a space point into a temperature difference between two space points, to real-time measure the optical turbulent flow. The method overcomes disadvantages that a micro temperature probe is easy to be polluted because of elements like dust and strong wind in a using process of temperature fluctuation measurement, and has characteristics that the optical turbulent flow intensity can be unattendedly, long-time and continuously measured even under severe environments like sea atmosphere environment, high temperature environment, psychro-environment and windy weather.

Description

Technical field: [0001] The invention relates to a new method for real-time measurement of optical turbulence intensity by 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 measurement method of the temperature pulsation meter 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 points in space. Under the assumption of uniform isotropic turbulent flow, after a certain period of time The tempe...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the shortcomings in the background technology, and propose an ultrasonic A new method for real-time measurement of optical turbulence intensity with an anemometer, using the acoustic virtual temperature measured by a high-precision ultrasonic anemometer, and correcting the acoustic virtual temperature to obtain air temperature. Under the Taylor assumption, the air temperature time series data measured at one point in space is transformed into two A new method for real-time measurement of optical turbulence through temperature difference provides a guarantee for continuous acquisition of optical turbulence intensity all day long

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