大气参数精度对激光传输预估结果的影响
Effect of precision of atmospheric parameters on beforehand-estimation of laser propagation
北京应用物理与计算数学研究所, 北京 100094
摘要
通过对不同情况下参数测量误差导致的到靶激光平均功率密度变化的统计, 得到了大气参数精度对激光传输计算结果的影响。风速和气溶胶吸收系数测量误差主要来自热晕效应的影响, 热晕越强, 对计算结果的影响就越大。强热晕时, 风速±(5%～8%)的误差可导致计算结果约±10%的误差；气溶胶吸收权重±(10%～20%)的误差可导致计算结果约 10%的误差。强湍流弱热晕时, 大气相干长度±(5%～7%)的误差可导致计算结果约±10%的误差。
Abstract
The differences of laser mean intensity on target that are induced by parameter errors are analyzed, and the effects of atmospheric parameter errors on the calculation precisions are obtained. The errors of wind velocity and aerosol absorption affect the calculation results by thermal blooming. The thermal blooming is stronger, the effects are severer. In strong thermal blooming, ±(5～8)% wind velocity errors will induce about ±10% calculation errors, and ±(10～20)% errors of aerosol absorption proportion will also induce about ±10% calculation error. In weak thermal blooming and strong turbulence, ±(5～7)% errors of turbulence coherent length will induce about ±10% calculation error.
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