Wave Field Projection Through Diffusive Media Using Phase Modulation
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Solution Overview
Problem
Current methods fail to effectively project images or wave fields into a space obscured by a diffusing medium, as they primarily focus on imaging through diffusing media rather than projecting through them.
Innovation Solution
The technology employs spatial phase modulators and non-conventional optical elements, such as complex holographic diffusers, to pre-distort wave fields, allowing them to be reshaped and focused through diffusers, enabling the projection of complex images or light fields into a diffusive environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional imaging methods are used to image through diffusing media, then imaging capability is achieved, but projection capability into obscured space is lost
Solution Approach 1:
The patent inverts the conventional imaging approach by using pre-distorted wavefronts that, after passing through the diffuser, converge to form focused images. Instead of trying to capture scattered light, the system proactively shapes the wavefront in advance to compensate for the diffuser's scattering effect, enabling projection capability through the obscured medium.
Solution Approach 2:
The system changes the wavefront parameters (phase and amplitude distribution) before illumination to match the diffuser's scattering characteristics. By calibrating the light field projector to determine pre-distorted wavefronts for multiple points in the projection volume, the system adapts the illumination parameters to achieve both imaging and projection functionality through the same diffusing medium.
2Loss of information
If spatial phase modulators and complex holographic diffusers are used to pre-distort wave fields, then projection capability through diffusers is achieved, but device complexity increases
Solution Approach 1:
The patent introduces a spatial phase modulator as an intermediary device between the light source and the diffuser. This modulator pre-distorts the wavefront to compensate for the diffuser's scattering effect, enabling focused projection through the diffuser. The intermediary device translates complex wavefront manipulation requirements into controllable phase modifications.
Solution Approach 2:
The system replaces complex mechanical optical elements with programmable spatial phase modulators that can dynamically adjust wavefront characteristics. This substitution allows flexible control of light field parameters without requiring precise mechanical alignment of multiple optical components, reducing overall system complexity while maintaining projection capability.
3Manufacturing precision
If pre-distorted wavefronts are used to focus through diffusers, then image focus and contrast are improved, but calibration complexity increases
Solution Approach 1:
The patent employs a calibration process that uses feedback from detected light fields to determine the optimal pre-distorted wavefronts. By measuring the actual light field after passing through the diffuser and adjusting the spatial phase modulator accordingly, the system achieves accurate focusing and high contrast images while systematically managing the calibration complexity through iterative optimization.
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 successful projection of high-content, high-contrast images or light fields through diffusing media, including three-dimensional images, by calibrating the light field projector to match the diffuser's properties, ensuring focused and clear image formation.
Implementation Method 1
The technology employs spatial phase modulators and non-conventional optical elements, such as complex holographic diffusers, to pre-distort wave fields
Implementation Method 2
a wave field projector configured to project a wave field onto the wave diffuser; and a controller configured to cause the wave field projector to project a wave field that, upon interacting with the wave diffuser, is redirected to form an object wave field
Implementation Method 3
projecting a wave field that, upon interacting with the wave diffuser, is redirected to form an object wave field
Implementation Method 4
ensuring focused and clear image formation
Data Source
AI summary
Methods and systems for projecting wave fields use a diffusing medium, a wavefront shaper, an illumination source, and a control system. A system for projecting an object wave field into a projection volume includes a wave scatterer, a wave field projector configured to project a wave field onto the wave scatterer, and a controller coupled to the wave field projector. The controller is configured to cause the wave field projector to project a wave field that, upon interacting with the wave scatterer, is redirected to form an object wave field that forms a predetermined pattern in the projection volume.