Pixel Dwell Time
Pixel dwell time plays an important role in the signal-to-noise (S/N) ratio in SEM. In the images below, a rose petal was imaged using four different pixel dwell times at a constant beam current of 3.1 pA. Especially when using such a low beam current, the pixel dwell time is a critical parameter which can boost the S/N ratio in the SEM image. At short dwell times, it can even be difficult to see the sample! The downside of longer pixel dwell times is they increase the overall collection time and, in some cases, can make charging worse.
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