Time-resolved imaging correction of irising effect of gated image intensifiers

It needs a triggered time to open or close optical gate of the ICCD. The duration time is defined as irising effect time. Although it only lasts a few nanoseconds and often be ignored by users, it can still interfere with the results in some applications such as fluorescence lifetime imaging and gated imaging. This paper proposes a fitting algorithm to correct the irising effect of the image intensifier. This method obtains fitting matrices of different gates through a series delay images of ICCD. Then through these fitting matrices, the imaging pictures are effectively corrected. The advantages of this method are low cost, high efficiency, and simplicity. The verification experiment of this paper is to write letters with a highlighter. The correction algorithm can clearly restore time-resolve image, and significantly improve the contrast of the image.