To solve coupling of 3D orthogonal scanning probe among three detecting directions
a calibration method based on multiregion and variable parameters coefficient matrix is presented. The 3*3 calibration matrix is used in calibration process
and the standard ball is divided into four basic areas according to the probe deformations. Let the probe contact several points planned on different areas of the standard ball and approach continuously to every point
and a number of data of the probe and linear grating are collected to establish a calibration equation
then four calibration matrices are so obtained with the least square method
and high-precise calibration for 3D orthogonal scanning probe can be finally achieved. The calibration results are experimentally verified with other two methods
which shows the higher calibration rate and precision. This study may offer a foundation for the high-precise measurement of 3D orthogonal scanning probe.
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references
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