摘要
为评价对流式湍流模拟装置的性能,验证所模拟湍流的稳定性,提高湍流模拟器装置的可信度,从区域稳定性、频谱稳定性以及不同波长条件下大气相干长度的变化情况3个方面进行了详细的检测与分析。在不同位置选取21个点进行独立测量,对模拟装置的光强闪烁与角起伏区域稳定性进行了检测与评价。采用532、808、1064、1550 nm4种波长激光器与检测装置,以大气相干长度作为检测指标对模拟装置所模拟湍流的大气相干长度随波长的变化情况进行了检测。最后,对测量数据的强度起伏与角起伏进行了频谱分析以评价模拟装置的频谱稳定性。实验结果表明:对流式湍流模拟装置在16 cm×16 cm区域内的波动量小于15%,不同波长条件下相干长度满足Kolmogrov理论,频谱波动量小于20%,对大气湍流进行了高精度、高可靠性、高稳定性的模拟。该研究内容为对流式湍流模拟装置的使用提供了有效的依据。
In order to evaluate the performance of the convection turbulence simulator, the stability of the simulate turbulence is tested and the credibility of the turbulence simulator is improved. The measurement and analysis are done from three aspects of regional stability, wavelength stability and frequency stability by using specific instrument. 21 points in specific locations are chosen for testing the regional stability of scintillation and angle-of-arrival. By using the coherence length as the indicator, 532 nm, 808 nm, 1064 nm and 1550 nm lasers are used to test the wavelength stability of the convection turbulence simulator. Finally, the spectra of scintillation and angle-of-arrival are analyzed to test the spectral stability of turbulence simulator. The experimental results show that, the performance fluctuation of the convection turbulence simulator in a 16 crux 16 cm area is less than 15%, the coherence length fluctuation under four wavelengths meets Kolmogrov theory and the spectrum fluctuation is less than 20%. The turbulence simulator can simulate the atmospheric turbulence with high precision, high reliability and high stability.The research provides a strong support for the applications of the convection turbulence simulator.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第10期57-64,共8页
Laser & Optoelectronics Progress
基金
国防科工局基础科研基金(A362080230)
关键词
大气光学
湍流模拟
稳定性
对流式湍流模拟装置
atmospheric optics
turbulence simulate
stability
convection turbulence simulator
