A quick and efficient technique for automatic profilometric
measurement of a large-form part is proposed and verified by experiment.
When a laser stripe is projected onto an object, the deformed laser
line image is detected by a solid-state array camera and automatically
transferred to its space position using a least-squares mapping algorithm.
Measurements can be executed on any surface of a 3-D object
except the base. Large arrays of data points are acquired on each surface
by means of a scanning mechanism. Since the measuring data from
each laser stripe position can provide 2-D information concerning the
surface contour, the laser stripe and the solid-state array camera are
integrated into a measurement system for obtaining the entire 3-D information.
Experimental results show that this technique can determine the
3-D profile of an object with an accuracy of 0.5 mm.