大动态范围高速光子相关器

Fast photon correlator with high dynamic range

目前光子相关器在处理速度和动态范围上还不能满足光子相关光谱技术的需求,为解决此问题,对比分析了比例相关器和多采样时间相关器的结构,并结合两者的优点提出利用多采样时间相关结构来设计相关器的高速通道,利用比例相关结构来设计相关器的低速通道,并将高速通道和低速通道相结合,实现大动态范围高速光子相关器的设计。实验结果表明:大动态范围高速光子相关器的采样时间下限可以达到10ns,动态范围达到1.1×1012,采用改进归一化方法时,基线误差为0.095%,相关函数具有足够的精度。

The running speed and dynamic range of existing correlators cannot meet the requirements of photon correlation spectroscopy.The structures of linear and multi-tau correlator were analyzed in order to overcome this disadvantage.An optimized correlator which included the fast channels by using multi-tau correlator and the slow channels by using linear correlator was proposed based on the advantages of both correlators.Therefore,a fast photon correlator with high dynamic range was designed by the optimized structure.Experimental data show that the sampling time of the fast photon correlator can be set to 10 ns,the maximal dynamic range is 1.1×1012,and the baseline error is 0.095% by using modified normalization method.