Line synchronization

"Line synchronization" means a synchronization of the timing to start electron-beam scan in each horizontal direction with the phase of the AC power wave when acquiring a STEM image. When the line synchronization function is operated at the image acquisition, the influence of external disturbance with the frequency (or the multiples of the frequency) of the AC power-source becomes same on every scan line, and then the external disturbance happening in each scan line apparently disappears. As a result, the fine noise in the horizontal scan line disappears, and the influence of the external disturbance is reduced from the STEM image.

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