高斯光束照射下的Vander Lugt相关器的特性研究

针对特定目标图像,定量分析了在Vander Lugt相关器中照明光束为高斯光束时输出相关峰值随高斯光束特性参量的变化情况。结果表明,输出相关峰值随高斯光束腰斑半径的减小和输入场景中目标位置偏离高斯光束中心距离的增加而减小。为了得到高的输出相关峰值,由扩束准直光学系统输出的高斯光束腰斑半径应满足一定的要求。

Vander Lugt correlator characteristic researching when Gaussian beam is used as illuminating beam

To given images,output correlation peak value versus parameters of Gaussian beam is analyzed quantificationally in Vander Lugt correlator when Gaussian beam is used as illuminating beam.Results show that with the Gaossian beam's waist radius becoming smaller and interval between target image and Gaussian beam center in the scene becoming bigger,output cor- relation peak value decreases.To gain high correlation peak value,waist radius of Gaussian beam must be adequate big.