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D
Dither
Dither is positioning noise of the scan mirrors in the time range of a few milliseconds.
Independently of their activated motion, scan mirrors oscillate irregularly across a broad frequency spectrum from roughly 200 Hz to 20 kHz. The excursion magnitude is specified as the standard deviation σ (or RMS ) of the scanner's optical angle . The resulting maximal amplitude can be approximated as 3σ.
In high-speed vector applications, dither effects during laser marking can produce irregular waves and spikes. At lower vector speeds, oscillations get concealed by overlapping laser pulses, but a slight broadening of marking occurs. This same broadening is also visible when a line is rewritten. Likewise, jump-and-shoot applications with short single pulses are susceptible to dither-induced imprecision. For long or repetitive pulses, dither broadens the effective beam or working diameter.
Systems with low dither
Special tunings (micro-machining) are available for applications requiring low dither amplitudes. The lowest dither is achieved using systems with digital encoders (se and de systems).
Lasers as Tools
By transforming lasers into universal tools, scanning solutions help to add functionality and value to materials. SCANLAB's broad palette of scanning solutions fulfills demands for higher speed, more precision, greater efficiency or improved environmental compatibility.
