远距离激光光斑位置高精度测量方法

为了提高激光光斑位置测量精度,考虑影响光斑测量精度的因素,并对若干关键技术进行研究。为了抑制由于气溶胶散射导致的激光后向散射,研究距离选通技术,提出一种基于四象限探测器的异步距离选通技术;为了削弱大气湍流的随机扰动对激光光斑成像的影响,提出一种改进的盲解卷积事后复原方法,并从数学上证明了该方法的收敛性;为了消除多传感器采集图像之间的差异,提出一种基于目标区域的图像配准算法;还原光斑图像并利用高斯曲面拟合法提取激光光斑的位置信息。实验结果表明,提取到的激光光斑位置精度不大于0.3pixel。

High Precision Method of Long-Ranged Laser Spot Position Measurement

In order to improve the precision of laser spot position measurement, several key technologies are studied. Range-gated technology is studied to restrain laser backscattering caused by aerosol scattering. An asynchronous range-gated method based on four-quadrant detector is introduced. An improved blind deconvolution method used to process images afterwards is introduced, which serves to lower the impact of atmosphere turbulence on laser spot imaging. An image registration method based on objective area is introduced to eliminate the difference between visible camera and infrared camera. Recover the spot and find the laser spot position using Gauss surface fitting. The experimental results show that the precision of laser spot position is not more than 0.3 pixel.