Wavefront Tester Calibration via Golden Sample Linear Fitting
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Solution Overview
Problem
Current wavefront measurement technologies, such as interferometers and Shack-Hartmann sensors, face challenges in accurately calibrating optical systems due to sensitivity to environmental variations, limited spatial resolution, and the need for precise mechanical and alignment corrections, which complicates the measurement of wavefront aberrations in optical systems.
Innovation Solution
A wavefront calibration method using golden samples to measure air wavefronts and calculate actual wedge angles and refractive indices, followed by linear fitting to produce accurate magnifications, allowing for reliable wavefront measurements by eliminating air wavefront errors and enabling precise calibration of wavefront testers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interferometers are used for wavefront measurement, then measurement precision is improved, but device complexity and sensitivity to environmental variations increase
Solution Approach 1:
The patent introduces a calibration lens with known parameters as an intermediary standard object. By measuring this known calibration lens and comparing measured values with actual values, the system establishes correction factors that compensate for environmental variations and system errors, thereby maintaining high measurement precision without requiring complex environmental control mechanisms
Solution Approach 2:
The patent employs parameter calibration by measuring known parameters of calibration lenses (focal length, curvature radius) and adjusting system parameters based on the difference between measured and actual values. This parameter-based correction approach simplifies the system by replacing complex physical stabilizations with computational parameter adjustments
2Manufacturing precision
If traditional calibration methods are used, then manufacturing precision may be maintained, but ease of operation and measurement speed deteriorate
Solution Approach 1:
The patent implements preliminary calibration by measuring calibration lenses with known parameters before actual wavefront measurements. The system pre-establishes correction factors and calibration curves from these known standards, which are then applied to subsequent measurements. This preliminary action simplifies operation by eliminating the need for complex real-time adjustments during actual measurements
Solution Approach 2:
The patent uses calibration lenses that replicate known optical parameters as reference copies. By creating a digital model of the expected parameters for standard lenses and comparing actual measurements against these copied references, the system achieves accurate calibration through simple comparison operations rather than complex adjustment procedures
3Measurement precision
If mechanical corrections and alignment adjustments are performed, then measurement precision is improved, but loss of time and productivity decrease
Solution Approach 1:
The patent replaces mechanical alignment adjustments and physical corrections with computational methods. By measuring calibration lenses and using software-based parameter correction, the system eliminates time-consuming mechanical adjustments while maintaining measurement precision through digital calibration and data processing
Solution Approach 2:
The system performs self-calibration by automatically measuring calibration lenses with known parameters and generating correction factors without requiring manual intervention. The automated calibration process measures the standard lenses, compares measured values with actual values, and updates system parameters automatically, eliminating the need for operator-performed mechanical adjustments and significantly reducing calibration time
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides quick, accurate, and automated wavefront calibration results, enhancing the reliability of wavefront measurements and improving the precision of optical system assessments, suitable for various applications including ophthalmology and AR/VR devices.
Implementation Method 1
Interferometers utilize the interference of superimposed electromagnetic waves to extract the phase and intensity information from an object under test
Implementation Method 2
measuring at least one golden sample wavefront to generate an actual wedge angle and refractive index of said at least one golden sample
Data Source
AI summary
A wavefront calibration method for a wavefront tester of a lens, the method including: measuring an air wavefront of the wavefront tester without the lens; measuring at least one golden sample wavefront to generate an actual wedge angle and refractive index of the at least one golden sample based on the air wavefront; calculating a measured wedge angle and refractive index based on the actual wedge angle and refractive index of the at least one golden sample; and linear fitting between the actual wedge angle and refractive index and the measured wedge angle and refractive index to produce an actual magnification of the lens.