Flyback time

"Flyback time" means the standby time for a scanning electron beam from the end of a horizontal scan to the start of the next scan at swing-back of the electron beam when acquiring a STEM image.
The electronic circuit responds non-linearly at the beginning of each horizontal line scan, giving rise to the distortion of the scanning waveform in a certain time zone. Only the linear response time zone of the electronic circuit should be used to eliminate distortions of the STEM image. Thus, the Flyback time is set longer than the non-linear response time zone, removing the response time zone with the distorted waveform from the image acquisition. As a result, the STEM image is obtained without distortion.

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