= Solution
<piezoelectric scanner creep> is the continued slow displacement after a step in scanner drive, even when the commanded voltage has stopped changing. The scanner's <strain> continues to relax, and the motion can resemble a slowly decaying, approximately logarithmic drift. After changing scan size, position or offset, early lines can therefore have stretched or compressed coordinates. Allow settling, avoid large abrupt moves, use a position-sensor <closed-loop control> system, and compare repeated images. This time-dependent response differs from the direction-dependent <piezoelectric hysteresis> and from ordinary thermal drift.
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