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

A technology for real-time measurement of turbulence intensity, which is applied in the direction of analyzing fluids using sound waves/ultrasonic waves/infrasonic waves, and can solve problems such as environmental impact restrictions and the inability to directly obtain optical turbulence intensity

Inactive Publication Date: 2013-11-20
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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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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  • New method for real-time measuring optical turbulent flow intensity by ultrasonic anemometer

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Embodiment Construction

[0021] Such as figure 1 As shown, the new method of ultrasonic anemometer to measure the intensity of optical turbulence in real time uses the ultrasonic anemometer to measure the time series data of the acoustic virtual temperature at a point in space, and then corrects the acoustic virtual temperature measured by the ultrasonic anemometer to obtain the air temperature. Under the Taylor assumption, the The air temperature time series data measured at one point in space is transformed into two points in space through the temperature difference, and the optical turbulence intensity is measured in real time; the specific steps include:

[0022] (1) Set the sampling frequency, statistical average time and space length of the ultrasonic anemometer;

[0023] (2) According to the identifier, it is judged whether the sound temperature data is normal, and the abnormal data is eliminated;

[0024] (3) by the formula The air temperature is obtained from the acoustic virtual temperatu...

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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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Application Information

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IPC IPC(8): G01N29/02
Inventor 吴晓庆
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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