Optical initial radiation intensity calibration method, device and system

Abstract

The invention relates to the field of atmospheric optics, in particular to a method, device and system for calibrating the initial radiation intensity of light. The method includes: obtaining a correction factor for the distance between the sun and the earth at the measurement moment, a relative air quality, and a voltage value of light of a given wavelength output by a measuring instrument in at least one measurement interval of the relative air quality, and the relative air quality is in the measurement interval The difference between the maximum value and the minimum value is at most 2; the relative air mass corresponding to the voltage value output by the measuring instrument is reciprocally transformed; according to the Beer-Lambert law, the voltage value of the light of a given wavelength output by the measuring instrument, After the reciprocal transformation, the relative air quality and the correction factor of the distance between the sun and the earth at the measurement time are used to calculate the calibration voltage value in each measurement interval by using the least squares regression algorithm. The method can reduce the measurement requirement of calibration, complete the measurement in a short time, reduce the measurement error and improve the feasibility of the measurement.

Description

technical field [0001] The invention relates to the field of atmospheric optics, in particular to a method, device and system for calibrating the initial radiation intensity of light. Background technique [0002] At present, the research on the optical properties of the whole atmosphere aerosol is playing an increasingly important role in many disciplines, such as climate change, laser communication, and laser transmission through the atmosphere. When measuring the optical parameters of the entire atmosphere, such as the transmittance of the entire atmosphere and the optical thickness of aerosols, the Lambert-Beer law (the basic law of light absorption) is generally used, which states that the intensity of radiation transmitted through an extinction medium follows an exponential function Attenuation, whose independent variable is the integral of the extinction coefficient to the distance of the transmission path. When measuring and inverting based on this law, it is necessa...

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Problems solved by technology

But in fact, it is very difficult to meet the above-mentioned measurement conditions required by the calibration method. The two are constantly changing with the rotation and revolution of the earth and the atmosphere itself. The longer the measurement time, the worse the stability of the atmosphere. , the greater the error of the final measurement result is

Therefore, the practicability of this method for calibration is poor

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