Acoustic Vortex Phase Correlation for Sub-Diffraction Target Detection
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Solution Overview
Problem
Traditional sonar detection systems are limited by the diffraction limit, which restricts the ability to detect small targets, especially in underwater environments, and increasing frequency or aperture size leads to attenuation and cost issues.
Innovation Solution
A method for target detection based on spatial phase correlation analysis of acoustic vortices, utilizing the unique phase modulation characteristics of acoustic vortices to overcome the diffraction limit by correlating the spatial phase of scattered acoustic fields with a reference matrix to determine target presence, size, and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional detection methods increase frequency or aperture size to overcome the diffraction limit, then spatial resolution is improved, but wave attenuation increases and detection range decreases
Solution Approach 1:
The patent changes the fundamental parameter of the acoustic wave from a conventional plane wave to an acoustic vortex wave with orbital angular momentum. This parameter change enables the system to achieve super-resolution capability without increasing frequency or aperture size, thereby avoiding the associated wave attenuation and detection range reduction.
Solution Approach 2:
The patent introduces the dimension of orbital angular momentum to the acoustic wave, creating a new state of acoustic energy that carries additional spatial information. This dimensional addition allows the system to overcome the diffraction limit without compromising the traditional trade-off between resolution and detection range.
2Measurement precision
If traditional detection methods enlarge aperture size to improve spatial resolution, then detection precision is improved, but cost and equipment compatibility issues increase
Solution Approach 1:
The patent changes the wave parameter from conventional to vortex-based, enabling high spatial resolution with existing aperture sizes. This eliminates the need for expensive large-aperture equipment while maintaining detection precision.
Solution Approach 2:
The patent substitutes the mechanical approach of physically enlarging the aperture with an optical/acoustic field approach using vortex waves. This replacement achieves the same resolution improvement without the mechanical complexity and cost associated with larger physical apertures.
3Measurement precision
If acoustic vortices are used to break through the diffraction limit, then detection of small targets is enabled, but the complexity of signal processing increases
Solution Approach 1:
The patent extracts the spatial phase information from the complex vortex wavefield and uses it as a separate detection parameter. By isolating this key information, the system can process it independently through correlation analysis, reducing the overall processing complexity while maintaining enhanced detection capability.
Solution Approach 2:
The patent introduces spatial phase correlation analysis as an intermediary processing step between the vortex wavefield and the target detection. This intermediary method simplifies the detection process by transforming the complex vortex field characteristics into a measurable correlation signal that directly indicates target presence and properties.
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
Enables detection of small targets beyond the diffraction limit by leveraging the phase information of acoustic vortices, improving detection accuracy and precision without the limitations of traditional methods.
Implementation Method 1
forming a zero-amplitude center due to destructive interference at the center
Implementation Method 2
These vortices carry orbital angular momentum, with wavefronts that twist around their axis
Implementation Method 3
the modulated spatial phase information exhibits distinct features
Implementation Method 4
When these vortices interact with targets of different materials, shapes, and sizes, the modulated spatial phase information exhibits distinct features
Implementation Method 5
extracting the correlation coefficient between the spatial phase of the scattered acoustic field and a reference phase matrix
Data Source
AI summary
A method for target detection based on spatial phase correlation analysis of acoustic vortices comprises the steps of generating a vortex-like excitation acoustic field, receiving the scattered acoustic pressure information after the incidence of the acoustic vortex, extracting the correlation coefficient between the spatial phase of the scattered acoustic field and the reference phase matrix, and predicting the presence, size, and spatial orientation of the target to achieve the target detection function. The method breaks through the diffraction limit to detect small targets and determine their spatial positions. Using acoustic vortices as information carriers, the method provides new ideas and technical solutions for the field of target detection.