Contact type profile measuring method of optical lens surface

Place the optical lens on the XY platform and move laterally along a single horizontal axis. The probe of the digital dial indicator on the Z axis moves vertically along the optical surface. The sliding height difference is converted into a digital signal and input into the computer together with the horizontal position data. The surface profile measurement of the optical lens can be completed through software calculation. The system includes a digital dial indicator, programmable controller (PLC), XY mobile platform, peripheral circuits and calculation computer. The standard test piece of the spherical convex lens with the radius of curvature of 107.14mm is used as the verification of the measurement accuracy of the system. The average value of the measured radius of curvature is 107.24mm, and the error value is ±0.1mm. The advantages of this research method are that it directly reflex of the height difference of the optical surface, is not affected by the interference of ambient light and the reflectivity of the optical surface, and can quickly measure the actual curve of the lens by using a simple algorithm.