An automatically detecting system for the shaping of transparent parts is designed and achieved. The
system is based on detecting laser spots for profile shaping. During the transmission of the laser beam
conveyed on the surface of transparent parts emitted from a He-Ne laser, the laser spot is captured by a
CCD (Charge-coupled Device) camera. When the transparent part is shaped, the laser beam is blocked
by parts and the laser spot decreases. Three key points on the surface of transparent part is monitored
from three lasers, which realize the flexible forming of transparencies. Moreover, the inspection of
changing laser spot is investigated, and the basis points of lasers and CCD cameras in horizontal and
vertical direction are located by mechanical devices. The whole measurement for the profile detection
of laser spot includes four steps: image capturing, image preprocessing, contour extracting and
selecting, fitting and calculating. The changes of laser spot can be measured and the threshold value
can be converted into the control of transparent parts’ shaping based on the mathematical method.
Using the proposed method, a real transparent object is measured. Experimental results show that the
proposed measurement system is effective and feasible.