Synthetic Aperture Imaging via Coherent Beam Interference
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Solution Overview
Problem
Existing optical imaging systems face challenges in achieving high-resolution images with compact and lightweight designs, as larger apertures are typically required for higher resolution, which can make systems bulky and difficult to maneuver.
Innovation Solution
The method involves combining multiple complex images obtained from smaller apertures at different orientations to create a synthetic aperture image, using coherent imaging beams and reference beams to form interference patterns, and processing the resulting side lobes in frequency space to enhance resolution without the need for physical aperture enlargement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large aperture is used to obtain higher resolution, then image resolution is improved, but system size and weight increase
Solution Approach 1:
The patent divides a large aperture into multiple smaller sub-apertures, each capturing a portion of the object's light. By segmenting the aperture, the system avoids the need for a single large aperture while still achieving high-resolution imaging through synthetic aperture techniques that combine information from multiple smaller apertures.
Solution Approach 2:
The patent transitions from spatial domain imaging to frequency domain processing by capturing interferometric data and performing Fourier transforms. This dimensional change allows the system to achieve high resolution in the spatial domain by processing information in the frequency domain, effectively bypassing the physical aperture size limitation.
2Measurement precision
If a large aperture is used to obtain higher resolution, then image resolution is improved, but system complexity increases
Solution Approach 1:
The patent replaces the mechanical approach of using a physically large aperture with an optical interferometric system combined with computational processing. Instead of mechanically constructing a large aperture, the system uses multiple small apertures with coherent light sources and performs mathematical synthesis to achieve equivalent or superior resolution.
Solution Approach 2:
The patent introduces coherent reference beams as intermediaries that interfere with the light from sub-apertures to encode phase information. This intermediary mechanism allows the system to capture and process complex amplitude and phase data that would otherwise be inaccessible, enabling high-resolution synthetic aperture imaging.
3Measurement precision
If multiple complex images are combined to create higher resolution, then image resolution is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary actions by capturing interferometric data that encodes both amplitude and phase information in a single measurement step. By encoding the complex information upfront through interference patterns, the system avoids the need for multiple sequential measurements and reduces the computational burden during processing.
Solution Approach 2:
The patent maintains continuity of useful action by using coherent light sources that provide continuous phase information across all sub-apertures. This continuous phase information allows for efficient Fourier-based processing that combines data from multiple apertures in a single computational step, rather than requiring iterative or discrete processing of separate measurements.
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 the creation of high-resolution images with a collective synthetic aperture that exceeds the resolution of individual sub-apertures, enabling improved imaging capabilities in compact systems, suitable for various applications including aerospace and laboratory settings.
Implementation Method 1
The complex images may be obtained by interfering a beam of light reflected from an object with another beam. The combined beams form an image that when recorded encode the complex information on spatial fringes.
Implementation Method 2
a first coherent imaging beam obtained through an aperture and a coherent reference beam
Data Source
AI summary
Disclosed are systems and methods for synthesizing a high resolution image associated with a large imaging aperture using an optical imaging apparatus having a smaller aperture. In certain implementations, introduction of a coherent homodyne reference beam to a coherent imaging of an object can result in formation of a Fourier space side lobe that includes information about a portion of a spectrum representative of the object's Fourier spectrum. Images can be obtained at a number of different orientations to yield a number of such side lobe images so as to allow construction of the object's spectrum. A synthesized image corresponding to such a constructed spectrum can have an improved resolution that exceeds the performance limit imposed by the aperture of the optical imaging apparatus.