模拟气泡幕激光近轴前向散射照度分布

Illumination distribution of forward paraxial scattering with bubble films

从Mie散射理论出发,利用单气泡散射理论模型研究了激光前向散射特性以及激光前向散射光轴周围激光照度分布状态。选用波长为632.8nm的激光,在不同介质和不同压强下测量并分析了气泡幕的散射光照度。研究表明,激光前向散射光主要分布在离光轴0.588°的范围内,其沿激光光轴呈轴对称分布,并且沿光轴方向截面分布为高斯分布;在考虑水体自身散射时,0.006MPa、0.008MPa和0.010MPa下,各个散射角被散射掉的光大概占激光前向散射照度的35%、45%和55%,可得到无论考虑水体自身散射与否,激光前向散射光与压强皆成反比。

From the Mie scattering theory, using single bubble scattering model, the forward scattering characteristics and the illumination distribution of forward scattering which around the optical axis of the laser were studied. With the wavelength of 632.8 nm, the illumination of scattering laser beam was measured and analyzed in different media under varied pressures. Research results indicate that, the forward scattering light beam of the laser mainly distribute in the range of 0. 588 o around the optical axis. Along the laser optical axis, illumination is axi- symmetric, and the cross-sectional distribution is Gaussian distribution. Considering the scattering of water body itself, the ratio forward scattering illumination is probably accounted 35%, 45% and 55% of the total under the pressures of 0. 006 MPa, 0. 008 MPa and 0. 010 MPa. The results show that the forward scattering light of the laser and pressure were inverse- ly proportional whether the water self-scattering is calculated or not.