Variable Microfluidic Optical Filters for Compact Hyperspectral Imaging
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Solution Overview
Problem
Current hyperspectral imaging systems face limitations in achieving high spatial, spectral, and temporal resolution while maintaining a cost-effective and compact design, often requiring complex computation or mechanical movement, which are impractical for commercial use.
Innovation Solution
The integration of a microfluidic flow filter using optically-active bodies, such as quantum dots, to modulate light before it reaches a sensor array, allowing for high spatial, spectral, and temporal resolution in a compact and cost-effective hyperspectral imaging system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional hyperspectral imaging systems use mechanical scanning or complex optical components to achieve high spectral resolution, then spectral resolution is improved, but device complexity and size increase
Solution Approach 1:
The patent replaces mechanical scanning systems with a microfluidic flow system that transports optically-active bodies through a flow cell. This substitution eliminates complex mechanical moving parts while achieving spectral resolution through the optical properties of flowing quantum dots, directly resolving the contradiction between spectral resolution and device complexity
Solution Approach 2:
The patent employs a microfluidic hydraulic system to control the flow of optically-active bodies through the imaging path. By using fluid dynamics instead of mechanical actuation, the system achieves precise spectral filtering with minimal mechanical complexity, addressing the trade-off between spectral resolution and system complexity
2Measurement precision
If hyperspectral imaging systems capture detailed spectral information across many bands, then spectral resolution is improved, but temporal resolution and speed decrease
Solution Approach 1:
The patent implements continuous flow of optically-active bodies through the microfluidic channel, allowing uninterrupted spectral measurement. The continuous hydraulic flow enables simultaneous capture of spectral information across multiple bands without sequential scanning delays, resolving the contradiction between spectral resolution and imaging speed
Solution Approach 2:
The optically-active bodies are pre-positioned and flowed through the system in a controlled sequence, with their spectral filtering properties already established before reaching the detector. This preliminary preparation of the optical path enables rapid spectral acquisition without real-time mechanical adjustment, addressing the speed-resolution trade-off
3Measurement precision
If hyperspectral imaging systems achieve high spatial and spectral resolution, then measurement precision is improved, but the system becomes impractical for commercial use due to cost and complexity
Solution Approach 1:
The patent changes the physical state of the filtering medium from solid mechanical components to liquid-flowing optically-active bodies. This parameter change enables the use of colloidal quantum dots that can be synthesized through established chemical methods, dramatically reducing manufacturing complexity and cost while maintaining high spatial and spectral resolution
Solution Approach 2:
The patent uses composite optically-active bodies comprising quantum dots embedded in a fluid matrix within the microfluidic channel. This composite structure combines the spectral filtering properties of quantum dots with the flow control capabilities of microfluidics, achieving high resolution imaging with manufacturable components and processes
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 high spatial resolution with pixel-level detail, high spectral resolution exceeding 50 bands, and instantaneous capture of hyperspectral images, overcoming the limitations of existing technologies.
Implementation Method 1
Colloidal quantum dots are semiconducting nanocrystals that generally have diameters below 20 nm, and as a result, exhibit quantum behavior due to the confinement of electrons within their structure
Implementation Method 2
The plurality of optically-active bodies comprises at least three filter bodies having distinct absorbance and/or photoluminescence curves over a desired range of wavelengths
Implementation Method 3
a microfluidic channel system defining a flow path for the plurality of optically-active bodies
Implementation Method 4
each light-sensitive sensor is configured to measure light intensity based on light that is reflected and/or emitted by an imaging target located outside of the flow filter and modified by an optically-active body within the flow filter
Data Source
AI summary
Provided herein are systems and methods of hyperspectral imaging microfluidic flow filters comprising flowable, optically-active bodies. These systems and methods provide novel light filtering systems and methods that improve spatial, spectral, and temporal resolution of hyperspectral imaging systems. In various aspects, the embodiments include measuring signals from a sensor array based on light reflected or emitted by the target, where a microfluidic channel system is arranged to allow light to pass through optically-active bodies flowing through the microfluidic channel system before reaching the sensor array.