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Rapid inspection method for measuring interior tilt and decenter in singlet lens
Ching-Yuan Chang1, Chien-Ching Ma, Kuo-Cheng Huang
1Mechanical Engineering Department, National Taiwan University, Taipei, Taiwan.
Applied Optics
|February 7, 2013
Summary
This study introduces a fast, noncontact method using polarized optics to measure lens tilt and decentration. The system achieves high accuracy and speed, crucial for lens manufacturing quality control.
Area of Science:
- Optical Engineering
- Metrology
- Lens Manufacturing
Background:
- Accurate measurement of lens parameters like tilt and decentration is critical for optical system performance.
- Existing methods may be slow or require contact, limiting real-time quality control in lens production.
Purpose of the Study:
- To develop and present a high-speed, on-line, noncontact method for measuring interior tilt and decentration in singlet lenses.
- To validate the proposed system's performance against theoretical predictions and simulations.
Main Methods:
- A noncontact measurement technique utilizing polarized optics was developed.
- The system was engineered for on-line inspection, integrating seamlessly into manufacturing processes.
- Measurements were performed on a deliberately tilted and decentered lens.
Main Results:
- The proposed system demonstrated strong agreement with theoretical predictions and CodeV simulations.
- The method offers a wide field of inspection, suitable for lenses up to 70 mm in diameter.
- Achieved measurement accuracy of 0.14 deg/pixel for tilt and 33 μm/pixel for decentration, with an inspection time of only 0.78 seconds.
Conclusions:
- The developed polarized optics system provides an effective high-speed, on-line solution for measuring lens tilt and decentration.
- This noncontact method enhances quality control capabilities in practical lens manufacturing.
- The system's accuracy and speed make it a valuable tool for optical inspection.
