Wavefront Sensor Moiré Effect Sensitivity
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Solution Overview
Problem
Wavefront sensors face a trade-off between sensitivity and dynamic range, with high sensitivity coming at the expense of reduced range and vice versa, while also being complex, expensive, and limited in image quality, size, weight, and versatility.
Innovation Solution
A wavefront sensor system utilizing two rotated Hartmann screens to create a Moiré effect, increasing lateral movement and reducing axial distance, thereby enhancing sensitivity and dynamic range while maintaining high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between the spot of light and the Hartmann screen is increased to increase lateral movement and sensitivity, then sensitivity is improved, but the axial distance increases causing spots to shift out of focus and reducing dynamic range
Solution Approach 1:
The patent introduces a second dimension by rotating the second Hartmann screen relative to the first screen. This rotation creates Moiré patterns that amplify the lateral movement of spots without requiring increased axial distance. The Moiré effect transforms small angular deviations into large lateral displacements through the interaction of two rotated aperture arrays, thereby achieving high sensitivity while maintaining a compact axial footprint.
2Measurement precision
If two rotated Hartmann screens are used to create Moiré effect and increase sensitivity, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the wavefront sensing function into two separate Hartmann screens, each with its own aperture array. By segmenting the measurement function across two screens with different orientations, the system achieves enhanced sensitivity through Moiré patterns while maintaining modular simplicity. Each screen can be independently designed and manufactured, reducing overall system complexity despite the dual-screen configuration.
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
The system achieves high sensitivity and dynamic range, providing accurate measurements of smaller wavefront slopes over a wide range, with improved image quality compared to Talbot-Moiré systems, and flexibility in wavelength measurement.
Implementation Method 1
A wavefront sensor system utilizing two rotated Hartmann screens to create a Moiré effect, increasing lateral movement and reducing axial distance
Data Source
AI summary
The present invention relates to a wavefront sensor using a pair of screens, each having a two-dimensional array of circular apertures, to achieve Moiré effects, and its use to measure the slope of a wavefront.