Metasurface Phase Layout for Uniform 3D Speckle Projection
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Solution Overview
Problem
Structured light projection systems face issues with poor speckle projection effects, leading to information loss due to low light intensity, which affects the detection and reconstruction of three-dimensional objects.
Innovation Solution
A method for designing a metasurface that involves determining an initial phase distribution based on a preset image and light source function, optimizing the phase distribution through simulation and adjustment of projection points to achieve a target phase distribution, ensuring uniform light intensity and distribution of speckles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional projection device projects speckles in a large area, then the coverage area is increased, but the light intensity of some speckles becomes lower than the detectable threshold
Solution Approach 1:
The patent applies local quality by optimizing the phase distribution of different regions of the metasurface to achieve uniform light intensity across the projection area. The phase distribution is specifically designed so that speckles in different locations (center and edge regions) have comparable intensities, addressing the issue where edge speckles are typically dimmer in conventional projections.
Solution Approach 2:
The patent changes the phase distribution parameter of the metasurface to optimize speckle projection. By adjusting the phase values across different regions of the metasurface, the system achieves uniform light intensity distribution while maintaining large area coverage, resolving the contradiction between projection area and light intensity.
2Reliability
If the light intensity of some speckles is lower than the detectable threshold, then the detection device fails to detect reflected speckles, but increasing light intensity may concentrate energy in specific regions
Solution Approach 1:
The patent ensures that all regions of the projection area, particularly edge regions, have sufficient light intensity for reliable detection. By optimizing the phase distribution to achieve uniform intensity across the entire projection area, the system ensures that speckles in all locations meet the detectable threshold, improving detection reliability without requiring excessive overall energy.
3Loss of information
If the projected speckles have poor projection effect, then information loss occurs affecting spatial reconstruction, but optimizing projection may increase device complexity
Solution Approach 1:
The patent optimizes the phase distribution parameter of the metasurface to achieve uniform and reliable speckle projection across the entire projection area. This parameter optimization ensures that all speckles maintain sufficient intensity for detection, preventing information loss in spatial reconstruction while using a single metasurface component rather than increasing overall system complexity.
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 optimized metasurface projects speckles with improved performance, enhancing the detection and reconstruction of three-dimensional objects by ensuring uniform light intensity and distribution, thereby improving the accuracy of spatial reconstruction.
Implementation Method 1
determining a phase distribution of an initial metasurface according to a preset image and a light source function of a first light source; performing a simulation based on the phase distribution of the initial metasurface and a second light source, so as to obtain a speckle image
Data Source
AI summary
A method and a device of designing a metasurface, and a storage medium are provided. The method includes determining a phase distribution of an initial metasurface according to a preset image and a light source function of a first light source; the preset image includes a plurality of projection points in an array; performing a simulation based on the phase distribution of the initial metasurface and a second light source, so as to obtain a speckle image; if the speckle image does not meet a preset standard, optimizing the phase distribution of the initial metasurface through adjusting the projection points on the preset image, so as to determine a target phase distribution; generating the metasurface according to the target phase distribution.