大气气溶胶红外散射透过率计算研究

红外辐射在大气中传播时大气气溶胶散射是能量衰减的原因之一.通过考虑气溶胶密度随高度变化,结合大气能见度参数,建立了红外线在水平均匀传播和斜程传播下的大气气溶胶散射透过率计算方法.水平均匀传输下,在中长波波段对大气气溶胶散射透过率采用常规积分求均值方法计算,与采用波长中值的工程计算公式结果对比,表明工程计算公式具有足够的...

Calculation of Infrared Scattering Transmittance of Aerosol

Atmospheric scattering is one of the factors influencing the energy attenuation of infrared radiation in the atmosphere. Considering the variation in the aerosol density with altitude, the calculation method of atmospheric scattering transmittance is developed for the horizontal homogeneous transmission and oblique transmission integrating the atmospheric visibility parameters. In the case of horizontal homogeneous transmission, the average transmission method of atmospheric aerosol scattering transmission in the mid-long wave band is calculated by performing conventional integration. Compared with the result of the engineering calculation formula using the median wavelength, the engineering calculation formula is shown to have sufficient engineering accuracy. For the case of slope propagation, a slope engineering calculation formula for infrared atmospheric aerosol scattering transmittance was obtained by integrating the altitude. The effects of the altitude, waveband, and visibility on the atmospheric scattering transmittance are calculated and analyzed. This study has great significance for the establishment of an independent accurate atmospheric transmittance calculation model, the downward-looking detection performance of computer-borne detectors for infrared targets, and provides a good understanding of the factors influencing atmospheric aerosol scattering transmittance.