Abstract
The non-uniformity of image directly affects the application of EMCCD in various disciplines. The proposed method can significantly improve the uniformity of EMCCD output image. The correction algorithm of "reverse split and forward recovery" is determined through analyzing the imaging model of EMCCD, and the comprehensive non-uniformity correction function model is established. The 8-tap EMCCD chip CCD220 of British e2v company is used for experimental verification. The results show that after the comprehensive correction the consistencies of the light response characteristic curve and the multiplication gain curve of each channel in EMCCD are obviously improved, and also the photo response non-uniformity (PRNU) of the output image is substantially reduced from 24.5 to 4.1%, which prove the effectiveness of the proposed method.
Highlights
The non-uniformity of image directly affects the application of EMCCD in various disciplines
The logical relationship between the influencing factors of non-uniformity in EMCCD is determined after the imaging model is put forward by analyzing the imaging principle of EMCCD, and the algorithm of "reverse split and forward recovery" is established
The 8-tap EMCCD chip CCD220 of e2v company is used for experimental verification
Summary
Y Take the texp as x-axis and the gray values of the i-th row and j-th column in the imagediff-i as y-axis for linear fitting. In this equation, row and col represent the number of rows and columns in a single image, respectively. The true multiplication gain of each channel can be obtained under m (m ≥ 30) different gain voltages. As for the first channel of CCD220, take the m gain voltages v as the X-axis and the corresponding real multiplication gain G as the Y-axis for exponential fitting to obtain the functional relationship between them. Turn on the integrating sphere until the radiant brightness is uniform and constant
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