The quality inspection system proposed in this paper is a
flatness inspection system based on the noncontact optical
triangulation principle. The system is designed to inspect
flatness of steel strips in real time and can also be applied to
inspect the flatness of many other metallic and nonmetallic
rolled products. The real-time constraint of this system is
the time in which flatness must be measured and sent to the
flatness-control actuators for the actions of the feedback to
take effect. The system consists of a laser emitter, which
projects a laser stripe transversally onto the surface of the
strip to be inspected. The optical sensor is a CMOS matrix
camera centered over the roll path of the production line, as
is shown in Fig. 7.