Rapid inspection method for measuring interior tilt and decenter in singlet lens

Abstract

The objective of this study was to present a high-speed, on-line means of measuring interior tilt and decentration in a singlet lens. We propose a noncontact method based on polarized optics, which provides inspection functions for the practical measurement of lenses. The proposed system was used to measure a tilted and decentered lens, and the results of which showed strong agreement with those obtained in theoretical predictions and CodeV simulations. The proposed method provides a wide field of inspection applicable to lenses with a diameter up to 70 mm. Measurement accuracy is of 0.14 deg/pixel in tilt, and 33 μm/pixel in decentration. Inspection time is only 0.78 s.

Laser confocal auto-collimation decentration measurement for spherical lens

“…In comparison with the contact measurement method, the measurement accuracy of the non-contact method has been significantly improved. These methods involve mainly laser centering [5], interference fringe [6], cyclic optical path [7], vortex beam angular momentum eccentric [8], image polarization [9], and auto-collimation measurement [10]. Among them, the auto-collimation measurement method uses a parallel beam passing through the objective lens to focus on the spherical center of the rotating lens surface, and the reflected beam generates a phased path on the detection surface.…”