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计算了圆形、矩形激光光斑对于激光扫描显示系统中散斑对比度的影响.对于圆形光斑,当光斑尺寸大于散射表面相关长度时,得到的散斑对比度随着光斑尺寸变小而下降;当光斑尺寸接近表面相关长度大小时,由于光斑中包含的散射颗粒变少,得到的是非高斯散斑,散斑的对比度反而会变大;随着激光斑进一步变小,由于镜面反射效果散斑的对比度会很快下降.对圆形光斑部分结果给出了实验验证.为了保证光斑中有足够的散射颗粒,只在一个方向压窄光斑,分别计算了平行于扫描方向和垂直于扫描方向压窄光斑得到的散斑对比度.平行于扫描方向压窄光斑,散斑的时间相关性会下降,平均效果变明显,散斑的对比度变小;垂直于扫描方向压窄,散斑对比度变化不大.
The effect of circular and rectangular laser spot on the speckle contrast in the laser scanning display system is calculated. For the circular spot, when the spot size is larger than the relevant length of the scattering surface, the speckle contrast decreases as the spot size decreases. When the size of the spot is close to the length of the surface, the contrast of the speckle becomes larger due to the smaller scattering particles contained in the spot, but the contrast of the speckle becomes larger. As the laser spot becomes smaller, the speckle of speckle The contrast will decrease rapidly, and some experimental results on the circular spot are given. In order to ensure enough scattering particles in the spot, the spot is only narrowed down in one direction, and the compressing parallel to the scanning direction and perpendicular to the scanning direction The contrast of the speckle obtained by the light spot.Compressing the light spot parallel to the scanning direction, the temporal correlation of the speckle will decrease, the average effect becomes obvious, the contrast of the speckle becomes smaller, and the contrast of the speckle will not change much when it is perpendicular to the scanning direction.