Gain and noise analysis of an intensified EMCCD
2011
In order to unite the merits of ICCD (intensified charge coupled device) and EMCCD (electron multiplying charge
coupled device) for detection of the weak signal in the high resolution Thomson scattering system from strong radiation
background, a second generation image intensifier, lens coupled with an EMCCD are used together as a detector. The
signal photon flux is so low in the actual measurement situation that the gain of the I.I., on-chip multiplication gain of
EMCCD and on-chip binning scheme might all need to be utilized to enhance the detection capability or to set lower
demands for other devices. At the same time, however, these amplification processes bring unexpected noise in addition
to the detector noise itself, which will further degrade the signal to noise ratio (SNR). This paper will focus on three
points. Firstly, the three gain methods, including MCP gain, EM gain and binning are theoretically described. Secondly,
the amount of increase in signal counts based on this detector combination is experimentally investigated at various gain
settings, as well as the total noise. Finally, a gain selection disciplines aiming to obtain an optimum SNR is generalized
according to the comparison between test results and theory.
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