| 1550nm infrared laser has been widely used in laser ranging and laser communication.When it is transmitted in the atmosphere,gas molecules,solid particles,rain and snow will cause the attenuation of laser signal,as a result,the detection capability of the receiver decreases,which directly affects the performance of laser ranging and the quality of communication.In this paper,the fast and accurate measurement of the propagation characteristics of 1550 nm infrared laser in the atmosphere is studied.The main achievements are as follows:Based on Koschmieder’s law and Burgh Johann Heinrich Lambert’s law,the composition and properties of atmospheric aerosols,the linear relationship between the intensity of scattered light and extinction coefficient,a scheme for calculating the atmospheric attenuation characteristics of 1550 nm laser by multi-point measurement of forward scattered light is proposed A forward scattering multi-point measurement hardware system is designed and developed,which consists of a 1550 nm laser emitting terminal,a control terminal with STM32 as the core and a receiving terminal with OPA380 as the photoelectric conversion device The system software of LCD1062 software configuration and display,and the system software design of the attenuation characteristic inversion of the measured data of AD module data acquisition are completed.The atmospheric attenuation characteristics of 1550 nm laser under various weather conditions are measured and analyzed by using the developed forward-scattering multi-point measurement system. |
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