Electromagnetic Phase Retrieval With Sparsity-Constrained Random Illumination
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Solution Overview
Problem
Conventional electromagnetic wave imaging technologies suffer from a low signal-to-noise ratio and high invasiveness due to the weakening of electromagnetic waves by scattering plates, which affects the imaging object.
Innovation Solution
An electromagnetic wave phase/amplitude generation device that uses a radiation unit to radiate electromagnetic waves with a random spatial frequency pattern, an imaging unit to capture scattered waves, and a generation unit to perform arithmetic sparsity constraint operations on the captured images to generate phase and amplitude information, thereby enhancing the signal-to-noise ratio and reducing invasiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a scattering plate is used to generate complex amplitude indicating phase and amplitude of scattered electromagnetic waves, then phase and amplitude information can be obtained in one imaging process, but the electromagnetic waves are weakened and the signal-to-noise ratio decreases
Solution Approach 1:
The patent introduces a random modulation pattern as an intermediary element that modulates the electromagnetic waves before they interact with the imaging object. This modulation pattern serves as a carrier that enables extraction of phase and amplitude information without requiring direct measurement of the scattered waves, thereby avoiding the signal weakening problem caused by traditional scattering plates
Solution Approach 2:
The patent replaces the mechanical scattering plate system with an arithmetic sparsity constraint operation system. Instead of using physical scattering to encode information, the system uses computational algorithms to reconstruct phase and amplitude information from intensity measurements, eliminating the need for signal-intensive physical scattering mechanisms
2Measurement precision
If the state of electromagnetic waves radiated to the imaging object is strengthened to compensate for weakening by the scattering plate, then the signal-to-noise ratio improves, but the invasiveness to the imaging object increases and the imaging object is adversely affected
Solution Approach 1:
The patent creates a mathematical model (copy) of the imaging process that simulates the interaction between electromagnetic waves and the imaging object. By solving inverse problems on this mathematical model, the system can determine phase and amplitude information without needing to physically enhance the electromagnetic wave intensity, thus avoiding damage to the imaging object
Solution Approach 2:
The patent replaces the physical mechanism of enhancing electromagnetic wave intensity with a computational mechanism. Instead of increasing the physical energy of radiated waves, the system uses arithmetic sparsity constraint operations to extract information from low-intensity measurements, eliminating the harmful effects of high-energy radiation on the imaging object
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 solution achieves a high signal-to-noise ratio and low invasiveness by directly detecting scattered light using an imaging element, allowing for accurate phase and amplitude determination of electromagnetic waves with reduced light intensity emission, thus minimizing the impact on the imaging object.
Implementation Method 1
a radiation unit that radiates electromagnetic waves of a random radiation pattern on a spatial frequency
Implementation Method 2
scattered electromagnetic waves that are electromagnetic waves generated when the imaging object scatters the electromagnetic waves of the radiation pattern
Implementation Method 3
an imaging unit that generates a captured image by imaging scattered electromagnetic waves
Implementation Method 4
performing an arithmetic sparsity constraint operation according to sparsity of the imaging object on the basis of the captured image generated by the imaging unit, information indicating the radiation pattern, and information indicating a signal of the imaging object
Data Source
AI summary
An electromagnetic wave phase/amplitude generation device includes a radiation unit configured to radiate electromagnetic waves of a random radiation pattern on a spatial frequency in which a state of the electromagnetic waves to be radiated for each divided region is determined to an imaging object, an imaging unit configured to generate a captured image by imaging scattered electromagnetic waves that are electromagnetic waves generated when the imaging object scatters the electromagnetic waves of the radiation pattern radiated by the radiation unit, and a generation unit configured to generate information indicating at least a phase and amplitude of the electromagnetic waves from the imaging object by performing an arithmetic sparsity constraint operation according to sparsity of the imaging object on the basis of the captured image generated by the imaging unit, information indicating the radiation pattern, and information indicating a signal of the imaging object.