Aperture Replication for Extended Depth of Focus Imaging
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Solution Overview
Problem
Current imaging technologies face challenges in achieving a large depth of focus while maintaining high resolution and energetic efficiency, as larger apertures result in smaller depth of focus and smaller apertures lead to low resolution and efficiency.
Innovation Solution
The technique involves creating replicas of an object's chirp with the same phase distribution at different locations within the aperture plane, using a random aperture or diffuser, and scanning the aperture plane to achieve a large depth of focus and super-resolved imaging without relying on lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large aperture is used in lens-based imaging, then lateral resolution is improved, but depth of focus deteriorates
Solution Approach 1:
The aperture is segmented into multiple discrete openings (pinholes) arranged in an array pattern. This segmentation allows the system to combine the resolution benefits of multiple aperture positions while maintaining the depth of focus advantages of small apertures, effectively resolving the contradiction between lateral resolution and depth of focus.
Solution Approach 2:
The invention transitions from traditional 2D aperture control to a 3D spatial configuration by arranging pinholes at different lateral positions and depths. This dimensional expansion enables the system to achieve extended depth of focus while maintaining high resolution through the combined effect of multiple aperture positions in three-dimensional space.
2Length of stationary object
If a small aperture is used to increase depth of focus, then depth of focus is improved, but lateral resolution and energetic efficiency deteriorate
Solution Approach 1:
Instead of using a single small aperture, the system segments the aperture into multiple small pinholes. Each pinhole maintains the depth of focus advantage while the array configuration collectively provides enhanced lateral resolution through the combined spatial information from multiple aperture positions.
Solution Approach 2:
The invention merges the output from multiple pinhole apertures into a single composite image. By coherently combining the light fields from multiple small apertures, the system achieves both the depth of focus of individual small pinholes and the resolution enhancement from having multiple aperture positions.
3Length of stationary object
If a small aperture is used to increase depth of focus, then depth of focus is improved, but energetic efficiency deteriorates
Solution Approach 1:
The aperture is divided into multiple pinholes, and each pinhole collects light independently. The total light collection is the sum of light from all pinholes, which significantly increases energetic efficiency compared to a single small aperture while each pinhole still maintains the depth of focus advantage.
Solution Approach 2:
The array of pinholes serves multiple functions simultaneously: each pinhole maintains depth of focus, the collective array provides enhanced light collection (energetic efficiency), and the spatial arrangement enables resolution improvement. This multi-functionality resolves the contradiction between depth of focus and energetic efficiency.
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 approach allows for high energetic efficiency and extended depth of focus with high spatial resolution, overcoming the limitations of traditional lens-based imaging systems by using a random plate and scanning to recover spatial frequencies.
Implementation Method 1
an aperture with an array of randomly distributed pinholes, or with a diffuser
Implementation Method 2
the same phase distribution of optical field generated by the chirp, this field matches with itself (effect of autocorrelation peak)
Data Source
AI summary
An optical arrangement is provided for use in imaging with a large depth of focus. The optical arrangement comprises an aperture unit, and a replication unit. The replication unit is configured for producing a plurality of replicas of an input optical field passed through the aperture unit such that the replicas include at least two replicas that are of substantially the same phase distribution and are created at different regions of the aperture unit plane.