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This feature is only available in ResScan (Resonant Scanning)

The amplitude of a resonant scanner does not always change linearly with the control voltage. Since the galvanometric mirror for the scan in y-direction has a linear response, this can lead to an image distorton in x-direction at different zoom levels.

ScanImage has a built in tool to correct for the non-linear amplitude of the resonant scanner. To access this feature, execute the following command in the Matlab command prompt:

This will show the Resonant FOV to Voltage Calibration Curve, which allows you to manipulate the zoom-to-voltage lookup table for the resonant mirror. After enabling the feature with the checkbox in the lower left corner, start a focus and adjust the zoom level until the distortion becomes visible. In the calibration window, add a control point and adjust the control point's position using the arrow buttons until the distortion is removed. Repeat the process for multiple zoom levels.

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In older versions of ScanImage 2015, no controls are available in the calibration window. Use the following commands to manipulate the lookup table:

Resonant Scanner Lookup Table Adjustment

 

The two knees in the lookup table adjust the voltage for zoom levels 2x and 3x to compensate for the non-linear amplitude response of the resonant mirror.

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