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Atmospheric-transmission laser transmittance measuring method

A measurement method and atmospheric transmission technology, applied in the direction of transmittance measurement, etc., can solve the problem of inaccurate laser transmittance measurement, and achieve the effect of simple operation

Active Publication Date: 2014-09-10
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for measuring the transmittance of laser light transmitted through the atmosphere, so as to solve the problem of inaccurate measurement of transmittance when the laser transmits in the atmosphere in the prior art

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  • Atmospheric-transmission laser transmittance measuring method
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  • Atmospheric-transmission laser transmittance measuring method

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Embodiment Construction

[0030] Such as figure 1 As shown, at wavelength λ a ~λ c Between, the solar spectrum is continuous, and the transmittance is different at different wavelengths; the filter is at the center wavelength λ b , the transmittance is the largest, but light waves pass through on both sides; the laser spectral lines are discrete, and there are multiple λ 1 lambda 2 ...λ n spectral line. at a certain wavelength λ b At , the transmittance of sunlight in the atmosphere measured by a solar radiometer is T sun , the measured atmospheric vertical water vapor column content is PW, the spectral response function of the filter on the solar radiometer is f(λ), and the calculated wavelength λ b The transmittance T when the laser is transmitted in the atmosphere laser .

[0031] In the present invention, at a certain wavelength λ b At the place, the transmittance of sunlight in the atmosphere is measured by the solar radiometer T sun , the measured atmospheric vertical water vapor colum...

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Abstract

The invention discloses a method for obtaining a laser atmospheric transmittance by utilizing a solar radiometer. The method comprises the following steps: measuring the total solar radiation transmittance Tsun of a specified wave band and the content PW of atmospheric vertical water vapor columns by utilizing the solar radiometer, performing analog computation on a spectral response function f (Lambda) by combining a radiance transfer equation and MODTRAN 5.0 software, thus finally obtaining the final calculation model of the total laser atmospheric transmittance Tlaser. The method fully considers the difference between a laser narrow spectral transmittance and a sunlight wide spectral transmittance, establishes the relationship of the laser atmospheric transmittance and the Tsun and the PW measured by the solar radiometer, minimizes the measuring error of the transmittance of laser during transmission in atmospheric air, and is suitable for the condition that atmospheric molecular absorption is mainly H2O absorption.

Description

technical field [0001] The invention relates to the field of laser atmospheric transmission, in particular to a method for measuring the transmittance of atmospheric transmission laser. Background technique [0002] When the laser is transmitted in the atmosphere, it will be attenuated by the effect of the atmosphere. The measurement and calculation of the transmission efficiency of the laser is very important for laser atmospheric detection, laser transmission experiment and free space laser communication. Normally, the measurement of laser transmittance is directly measured by emitting laser light, but it is difficult to verify the accuracy of the measurement with a single measurement method. When the transmittance of laser in the atmosphere is not easy to measure directly, the solar transmittance The relationship with the laser transmittance, using the solar transmittance to derive the laser transmittance, is a powerful supplement to the direct measurement method. Howeve...

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Application Information

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IPC IPC(8): G01N21/59
Inventor 程知侯再红何枫谭逢富靖旭秦来安张巳龙
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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