Transformations

The transformation settings determine how data is converted from sensor coordinates to system coordinates (for an overview on coordinate systems, see Coordinate Systems). The transformations are found in the Transformations section of the Active Area tab on the Sensor panel. Typically, transformations are set when you align a sensor using the alignment procedure on the Alignment panel. However, you can also manually set these values.

If you perform an alignment using the Surface Align Wide or Surface Align Ring tools, these values are not updated. For more information, see Aligning Sensors to 6 Degrees of Freedom.

Parameter Description
X Offset

Specifies the shift along the X axis. With Normal orientation, a positive value shifts the data to the right. With Reverse orientation, a positive value shifts the data to the left.

Y Offset

Specifies the shift along the Y axis.
Z Offset

Specifies the shift along the Z axis. A positive value shifts the data toward the sensor.
Angle X Specifies the tilt around the X axis. This creates a skew clockwise around the X axis (pointing toward the viewer).
Angle Y Specifies the tilt around the Y axis. This rotates profiles counter-clockwise around the Y axis (pointing toward the viewer).
Angle Z Specifies the tilt around the Z axis. This creates a skew clockwise around the Z axis (pointing toward the viewer).

When applying the transformations, the data is first rotated around X (clockwise, with the X axis toward the viewer), then Y (counterclockwise), and then Z (clockwise), and then the offsets are applied.

Setting Angle X or Angle Z, and to a lesser extent Y Offset, to a non-zero value increases CPU usage when scanning, which reduces the maximum scan speed.

Artifacts may appear in scan data when Angle Z or Angle X is set to a non-zero value if encoder trigger spacing is set too high (resulting in a low sampling rate).

To configure transformation settings:

1. Go to the Scan page.
2. Choose a mode other than Video mode in the Scan Mode panel.

If Video mode is selected, you will not be able to change the settings.
3. Expand the Sensor panel by clicking on the panel header.
4. Click the button corresponding to the sensor you want to configure.

The button is labeled Top, Bottom, Top-Left, or Top-Right, depending on the system.

Transformations can be configured separately for each sensor.
5. Expand the Transformations area by clicking on the expand button .

See the table above for more information.
6. Set the parameter values.

See the table above for more information.

The Y offset, X angle, and Z angle transformations cannot be non-zero when Uniform Spacing is unchecked. Therefore, when aligning a sensor using a bar alignment target with Uniform Spacing unchecked, set the Degrees of Freedom setting to X, Z, Y Angle, which prevents these transformations from being non-zero.
7. Save the job in the Toolbar by clicking the Save button .
8. Check that the transformation settings are applied correctly after the sensor is restarted.