Linear Variable Optical Filters for Flow Cytometry Spectral Discrimination
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Solution Overview
Problem
Current light detection systems in flow cytometry face challenges in accurately characterizing particles in a flow stream due to limitations in spectral discrimination and signal processing, leading to reduced precision and increased noise in light detection.
Innovation Solution
The system employs a wavelength separator component that propagates light between two sets of linear variable optical filters, each set passing predetermined sub-spectral ranges, coupled with a plurality of photodetectors to detect light from each sub-spectral range, and a photodetector modulator component for binning data signals from multiple photodetector channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single broad spectral range is detected, then the light collection efficiency is high, but the spectral discrimination precision is low
Solution Approach 1:
The spectral detection range is divided into multiple sub-spectral ranges using a set of linear variable optical filters. Each filter transmits a specific wavelength range (e.g., 500-650nm, 650-800nm), allowing the system to segment the broad spectrum into discrete, manageable bands. This segmentation enables precise spectral discrimination while maintaining adequate light collection efficiency within each sub-range.
Solution Approach 2:
The patent introduces a spatial dimension to spectral analysis by positioning photodetectors at different locations along the optical path, where each location corresponds to a specific sub-spectral range. This spatial arrangement of detectors across the spectral dimension allows simultaneous detection of multiple wavelength ranges without requiring multiple separate optical paths, thereby maintaining high light collection efficiency.
2Adaptability or versatility
If multiple spectral ranges are detected simultaneously, then the characterization capability is improved, but the system complexity increases
Solution Approach 1:
The linear variable optical filters serve multiple functions: they act as wavelength-selective elements, spatial separators for different spectral ranges, and enable simultaneous multi-channel detection. The same optical component structure handles both spectral discrimination and light routing, reducing the need for separate complex optical elements for each function.
Solution Approach 2:
The patent merges the spectral filtering function with the spatial routing function by integrating linear variable optical filters that simultaneously perform wavelength selection and direct light to specific photodetector positions. This consolidation reduces the number of separate optical components needed compared to using independent filters and mirrors for each spectral range.
3Loss of energy
If the surface area of the detector is increased, then the light collection efficiency is improved, but the resolution and precision of spectral detection deteriorates
Solution Approach 1:
Instead of using a single large detector surface, the system segments the detection function across multiple photodetectors positioned at different locations. Each detector has a smaller surface area optimized for its specific sub-spectral range, while the collective array covers the full spectral range. This segmentation maintains spectral resolution by assigning specific wavelength ranges to specific detectors.
Solution Approach 2:
The linear variable optical filters act as intermediaries between the broad spectral input and the individual photodetectors. These filters transmit only the relevant wavelength ranges to each detector position, ensuring that each small detector surface receives light with a defined spectral composition. This intermediary function enables both high light collection efficiency and maintained spectral resolution.
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 configuration enhances the precision of capturing targeted spectral emission bands, increases the signal-to-noise ratio, and allows for the detection of multiple spectral ranges with reduced light loss, thereby improving the characterization of particles in the flow stream.
Implementation Method 1
a wavelength separator component configured to propagate light between a first set of linear variable optical filters and a second set of linear variable optical filters where each set of linear variable optical filters is configured to pass light having predetermined sub-spectral ranges
Implementation Method 2
a plurality of photodetectors positioned to detect light from each sub-spectral range across the linear variable optical filters
Data Source
AI summary
Aspects of the present disclosure include systems for detecting light from a particle in a flow stream by spectral discrimination. Light detection systems according to certain embodiments include a wavelength separator component configured to propagate light between a first set of linear variable optical filters and a second set of linear variable optical filters where each set of linear variable optical filters is configured to pass light having predetermined sub-spectral ranges and a plurality of photodetectors positioned to detect light from each sub-spectral range across the linear variable optical filters. Systems having a light source for irradiating a particle in a flow stream and a photodetector modulator component for binning data signals generated in a plurality of photodetector channels of the light detection system are also described. Methods for detecting light with the subject systems and kits having one or more components for detecting light according to the subject methods are also provided.