Because the forming process of transparent surface is entirely artificial, it is difficult to
meet the requirements of real-time and high precision. In this paper, the laser monitoring system
solution can solve this problem. This system consists of three parts, a laser, a CCD camera, and a
computer. The laser beam is injected to the transparent surface, and received by the CCD camera.
The image is processed by the computer in real-time. By the changes of laser spot during the
forming process, a solution is proposed to calculate the difference between the two spot images,
which determines the change of height. The experimental results show that when the
transparent surface grows 1mm, the effective axial length changes 30 pixels. After multiple
measurements, we obtain the relationship curve between the height of the transparent surface
and effective axial length. According to the curve, we calculate the measurement error is 2.725%.
The processing speed of computer is also measured. It can process 10 pictures per second. The
algorithm reflects superiority in both accuracy and processing speed.