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Angle Terms

Mechanical Angle

The mechanical angle is the rotation angle of the deflection mirror in the scan system, i.e. the angle to which the mirror has actually been rotated.

Optical Angle

The optical angle is the deflection angle of the laser beam exiting the scan system relative to the neutral position of the mirrors. The optical angle is twice the mechanical angle  – rotating the mirror to a particular angle causes deflection of the emerging laser beam at twice that angle.

(Typical) Angular Deflection

A galvanometer scanner's typical angular deflection is the positive and negative maximum controllable optical angle . Scanners can be calibrated to meet various image field requirements.

Calibration Angle

The calibration angle is 96% of the max. deflection angle (mechanical) in one direction, from center to edge.

Full scale

Full scale is the entire optical angle from one extreme to the other.

Vignetting-Free Angle

A defined aperture’s vignetting-free angle is the maximum optical scan angle for which no significant shadowing occurs during traversal through the optical system. In practice, it’s the usable scan angle taking all components into account.

Angle transmitter

SCANLAB distinguishes between analog and digital position detectors.

Analog position detectors are typically optical and utilize a cost-efficient detection method. Analog position detectors are built into all standard scan heads, as well as the II and III systems.

Digital position detectors possess superior characteristics with respect to precision, long-term stability and dynamics and therefore fulfill even the most challenging industrial requirements. Digital position detectors are used in the de and se systems.

For more (in German) on the advantages and functional principle of SCANLAB's galvanometer scanners with "se" position detectors, read this article in LASER MAGAZIN 4/2014.

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