Electronics Optics & Control, Volume. 26, Issue 7, 80(2019)

Signal to Noise Ratio of CMOS and EMCCD in Global Shutter Mode

ZHANG Xiaoyang1...2, LIU Jinguo1, KONG Dezhu1, LI Guangze1, CHEN Jiayu1, PENG Chang1,2 and YU Da1 |Show fewer author(s)
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    Global shutters have advantages in hyperspectral imaging, mapping, and star-sensing applications for Earth observation, but their application effects also depend on high signal-to-noise ratios. According to the characteristics of CMOS imaging, a low-voltage reference source circuit capable of sourcing and sinking current and a focal plane electron with low thermal distortion are designed. A method of receiving multi-channel serial data with uncertain initial state of power-on is proposed.According to the influence of the parasitic light sensitivity unique to the global shutter, the multi-point fitting correction method based on line-by-line counting and taking the middle line as the reference is adopted.The front-illuminated CMOS imaging system and cooled back-illuminated EMCCD are tested according to EMVA1288 standard.The standard deviation of the single image before and after calibration is 3.37 and 0.42 respectively, the maximum SNR is 123.37, and the maximum SNR of the EMCCD is 359.43. The results show that the correction method can effectively reduce the fixed pattern noise of the global shutter. There is a big gap between the SNR of the area array CMOS in the global shutter mode and that of EMCCD.

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    ZHANG Xiaoyang, LIU Jinguo, KONG Dezhu, LI Guangze, CHEN Jiayu, PENG Chang, YU Da. Signal to Noise Ratio of CMOS and EMCCD in Global Shutter Mode[J]. Electronics Optics & Control, 2019, 26(7): 80

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    Paper Information

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    Received: Jul. 16, 2018

    Accepted: --

    Published Online: Jan. 6, 2021

    The Author Email:

    DOI:10.3969/j.issn.1671-637x.2019.07.016

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