Etaloning is a phenomenon that occurs when the incident light interferes with the reflected light from the back surface of the silicon and causes varying sensitivity – dependent both on the spatial and the spectral position.
In the case of EM-CCD, multiplying of the signal in the multiplying register has noise associated with that process and this will influence the SNR. The noise caused by signal multiplying is called excess noise and is added to the signal. The excess noise F is calculated by the multiplying factor M and a ratio of the dispersion of a multiplying register input signal: σin and a dispersion of the multiplying register output signal: σout.
In external trigger mode, the camera receives timing signals via a trigger cable from external sources. The camera runs at a frame rate determined by the time between trigger inputs, but not less than the exposure time plus the readout time.
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