无透镜鬼成像关联参数优化

Relevant Parameter Optimization of Lensless Ghost Imaging

为提升无透镜鬼成像的成像质量,构建了基于赝热光源的无透镜二阶鬼成像实验系统。分析了关联计算次数、物臂探测器尺寸和两臂偏离量等参数对无透镜鬼成像质量的影响,并通过信噪比和均方误差对重构图像的成像质量进行了定量评估。研究结果表明:当关联计算次数大于2 000次时,继续增大关联计算次数不能明显提升成像质量。为了保证鬼成像重构图像质量,物臂探测器面积应小于1 640μm^2,参考臂和物臂的偏离量应小于10 cm。

In order to improve the image quality of the lensless ghost imaging,a lensless ghost imaging experimental system with second order was constructed based on the pseudo-thermal light.The effect of the correlation number,the detector size of the object arm,and the deviation of object arm and reference arm on the image quality of the lensless ghost imaging was studied.The image quality of the constructed image was evaluated quantitatively by the signal-to-noise ratio and mean square error.The results show that the image quality is no longer improved obviously when the correlation number is more than 2 000 times.To ensure the image quality of the constructed image,the detector area on the object arm is less than 1 640 μm^2 and the deviation of two arms is less than 10 cm simultaneously.