Hyperspectral Microscopy Phase Mask for Snapshot 3D Cube Reconstruction
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Solution Overview
Problem
Existing snapshot hyperspectral imaging systems face a trade-off between spatial and spectral resolution, are often bulky and expensive, and are difficult to integrate with existing microscopes, limiting accessibility and temporal resolution.
Innovation Solution
A compact snapshot hyperspectral microscopy system using a diffuser and spectral filter array decouples spatial and spectral encoding, utilizing compressed sensing to reconstruct high-resolution hyperspectral data cubes from a 2D measurement, and can be easily attached to benchtop microscopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scanning-based systems are used to achieve high spatial and spectral resolution, then spatial resolution and spectral resolution are improved, but temporal resolution deteriorates due to scanning requirements
Solution Approach 1:
The system segments the spectral encoding from spatial encoding by using a spectral filter array that disperses light into wavelength components, allowing simultaneous capture of spatial and spectral information in a single snapshot without sequential scanning
Solution Approach 2:
The patent adds a spectral dimension to the 2D spatial image by using a spectral filter array and diffuser combination, transforming the imaging process from 2D spatial capture to 3D hyperspectral data cube acquisition in a single exposure
2Speed
If snapshot HSI systems are used to improve temporal resolution, then temporal resolution is improved, but spatial-spectral resolution deteriorates
Solution Approach 1:
The patent introduces a diffuser as an intermediary optical element between the spectral filter array and the image sensor, which creates a structured point spread function that enables computational reconstruction of high-resolution spatial-spectral data from snapshot measurements
Solution Approach 2:
The system changes the optical parameters by using a specific diffuser design with controlled scattering properties that shapes the point spread function to have sharp autocorrelation, enabling high-resolution reconstruction through compressed sensing algorithms
3Speed
If traditional snapshot HSI systems are used, then temporal resolution is improved, but device complexity and cost increase due to additional components
Solution Approach 1:
The patent designs a universal attachment that can be coupled to any traditional benchtop microscope output port, making snapshot hyperspectral imaging accessible to existing microscopy systems without requiring custom fabrication tools or specialized components
Solution Approach 2:
The system uses commercially available off-the-shelf components including standard spectral filter arrays and common diffuser materials, replacing expensive custom-fabricated elements with affordable, easily obtainable parts that reduce both cost and fabrication complexity
4Speed
If snapshot HSI systems are used, then temporal resolution is improved, but accessibility deteriorates due to lack of custom fabrication tools and high cost
Solution Approach 1:
The patent employs inexpensive, commercially available spectral filter arrays and diffusers that can be purchased without custom fabrication, dramatically improving accessibility for laboratories without specialized manufacturing capabilities
Solution Approach 2:
The design uses a standardized microscope output port as an intermediary interface, allowing the snapshot HSI attachment to connect to existing microscopes without requiring modification of the parent instrument, thus improving ease of manufacture and deployment
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 system achieves higher spatial and spectral resolution with improved temporal resolution, is cost-effective, and can be integrated with existing microscopes, enhancing accessibility and reducing fabrication complexity.
Implementation Method 1
The phase mask, also known as a diffuser, spreads out the light from each point in the object such that the light passes through multiple spectral filters on the image sensor
Implementation Method 2
A camera assembly contains a lens, phase mask, and spectral filter array
Data Source
AI summary
A snapshot hyperspectral imaging camera assembly and processing methods are provided that has a higher achievable resolution than a traditional snapshot imager. The camera assembly is compact and can be attached to the output port of any traditional benchtop microscope. This camera assembly has a relay lens that relays the Fourier plane from the microscope onto a phase mask that encodes the spatial information of the target, and a spectral filter array that encodes the spectral information of the target. Measurements are processed with a compressed sensing algorithm and an optimization algorithm to reconstruct a 3D hypercube from 2D intensity measurements.