Adaptive Optical Beam Scanning for Wide-Field Anisoplanatic Correction
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Solution Overview
Problem
Adaptive optics technology is limited to correcting aberrations within a small isoplanatic region of 2°, restricting the field of view in retinal imaging, and existing multi-conjugate adaptive optics systems are complex, costly, and unsuitable for scanning imaging systems.
Innovation Solution
A method and apparatus for anisoplanatic aberration correction in a wide field of view using temporal and regional corrections, employing a single wavefront sensor and corrector, with temporal correction in the scanning direction and regional deconvolution in the beam direction, to achieve complete aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If adaptive optics is used to correct aberrations, then imaging resolution is improved, but the field of view is limited to a small isoplanatic region of 2°
Solution Approach 1:
The patent divides the wide field of view into multiple overlapping sub-regions, each within the isoplanatic angle. A single wavefront sensor and corrector sequentially measure and correct aberrations for each sub-region, effectively segmenting the correction task to overcome the limited isoplanatic region while maintaining high resolution in each segment.
Solution Approach 2:
The system dynamically adjusts the beam scanning position and wavefront measurement timing to capture and correct aberrations across different field positions. The sequential temporal correction approach allows the single adaptive optics system to adapt to varying aberration conditions across the wide field of view.
2Area of stationary object
If multi-conjugate adaptive optics (MCAO) is used to expand the field of view, then the isoplanatic region is expanded, but system complexity and cost increase significantly
Solution Approach 1:
The patent makes a single wavefront sensor and corrector perform multiple functions by sequentially measuring and correcting aberrations across different field positions through beam scanning. This universal approach eliminates the need for multiple redundant adaptive optics systems, significantly reducing system complexity and cost while achieving wide field of view correction.
Solution Approach 2:
The system creates virtual copies of the correction process by sequentially applying the same single adaptive optics system to multiple field positions. Instead of deploying multiple physical correction systems, the patent uses temporal sequencing to replicate the correction function across the wide field of view.
3Area of stationary object
If multiple wavefront sensors and correctors are used for wide field correction, then aberration correction coverage is improved, but imaging speed decreases due to complex closed-loop control
Solution Approach 1:
The patent segments the wide field into sub-regions and sequentially processes each region with a single adaptive optics system. This segmentation approach avoids the complex simultaneous control of multiple systems, maintaining faster imaging speed while achieving comprehensive wide field correction through time-sequential processing.
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
Overcomes the isoplanatic region limitation, enabling high-resolution retinal imaging in a wide field of view with minimal system complexity and cost, and flexible online or offline processing.
Implementation Method 1
measuring the aberration of each imaging sub-region by a wavefront sensor
Implementation Method 2
feeding back to control a wavefront corrector successively to complete a closed-loop correction
Implementation Method 3
adaptive optical linear beam scanning imaging
Data Source
AI summary
An anisoplanatic aberration correction method and apparatus for adaptive optical linear beam scanning imaging. The method comprises: in an adaptive optical linear beam scanning imaging system, performing temporal correction on an anisoplanatic region aberration in a linear beam scanning direction, and performing regional correction on an anisoplanatic region aberration in a linear beam direction. According to the method, the limitation of an isoplanatic region on an adaptive optical imaging field of view can be overcome, and wide field of view aberration correction and high-resolution imaging of a retina is realized. According to the provided method and apparatus for temporal and regional correction of a wide field of view anisoplanatic aberration, the wide field of view aberration correction can be completed by means of only a single wavefront sensor and a single wavefront corrector, such that almost none of the system complexities is increased.