光致气溶胶粒子加热的等效吸收系数
EFFECTIVE ABSORPTION OF AEROSOL HEATED BY LASER
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摘要: 当激光加热气溶胶粒子,所有气溶胶粒子都将吸热,部份吸收的热量将储存在内部构成一个热阱;部分加热周围空气,改变周围空气的温度分布。本文将现有连续激光加热单个气溶胶粒子热晕的理论引入群体气溶胶粒子,建立了群体气溶胶粒子加热空气的等效吸收系数公式,计算了不同类型的粒子的等效吸收系数以及延迟时间。Abstract: Thermal blooming induced by aerosol is discussed in laser beam propagation though atmosphere. We give the effective absorption coefficient αpff(t). Because of the limited conductivity of air, the increment of temperature of air heated by aerosol absorbing energy from laser beam is imhomogeneous, which lead to the αpff(t) dependent on time. The delay time tp, when the αpff(t)arrives at the maximum value, is dependent on the radius of aerosol.
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Key words:
- aerosol /
- high power laser /
- thermal blooming /
- effective absorption coefficient
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