Confocal Microscope Detector Array for Molecule Diffusion Analysis
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Solution Overview
Problem
Current fluorescence correlation spectroscopy (FCS) methods are limited in determining the speed and direction of molecule diffusion processes in biological samples, requiring complex technical arrangements and alignments to achieve accurate measurements.
Innovation Solution
A microscope system with a controllably adjustable beam-shaping optical unit and a detector array allows for the creation of varying confocal volumes, enabling precise measurement of molecule movement properties by adapting the beam shape and using a spatially resolving detector array to analyze individual detector elements for cross-correlation analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple confocal volumes are used to determine flow speed and direction, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detector array is segmented into multiple detector elements, each sensitive to fluorescence from a specific spatial region. By analyzing the signal distribution across these segmented detector elements, the system determines flow characteristics without requiring multiple separate confocal volumes, thus reducing beam path alignment complexity while maintaining measurement precision.
Solution Approach 2:
The invention transitions from a single-point detection approach to a spatially-resolving detection approach by using a detector array. This adds a spatial dimension to the measurement, allowing flow speed and direction to be determined through the spatial distribution of signals across multiple detector elements, eliminating the need for complex multi-volume beam path alignment.
2Measurement precision
If complex beam path alignment is used to create multiple confocal volumes, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The detector array inherently provides spatial resolution through its physical arrangement, automatically capturing information about the spatial distribution of fluorescent signals. The system self-determines flow characteristics by analyzing the signal patterns across the array elements, eliminating the need for manual beam path alignment procedures and complex operational steps.
3Device complexity
If a single confocal volume is used for FCS measurements, then device complexity is reduced, but measurement precision for movement properties deteriorates
Solution Approach 1:
The single confocal volume is segmented into multiple spatial regions through the detector array, with each detector element capturing fluorescence from a specific region. This segmentation allows the system to determine flow speed and direction by analyzing signal variations across different spatial regions, maintaining measurement precision while using a single confocal volume configuration.
Solution Approach 2:
The system adds a spatial detection dimension by using a detector array instead of a single-point detector. This enables the measurement of flow characteristics through spatial signal distribution across the array elements, achieving precise speed and direction determination without requiring multiple confocal volumes or complex beam path arrangements.
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 accurate determination of molecule movement speed and direction, even at high concentrations, with improved signal-to-noise ratio and reduced calibration needs, enabling detailed analysis of biological samples with varying concentrations and diffusion processes.
Implementation Method 1
a beam-shaping optical unit for shaping the excitation radiation to form a confocal volume in the sample space
Implementation Method 2
an objective for capturing a detection radiation coming from a confocal volume created in the sample
Implementation Method 3
a detector in the form of a detector array having a plurality of detector elements... the measurement values from the detector elements can each be read and analyzed on an individual basis
Data Source
AI summary
A microscope for determining properties of moving objects in a biological sample can include a sample space for arranging a biological sample and an objective for capturing a detection radiation coming from a confocal volume created in the sample. The microscope can have a detection beam path along which a captured detection radiation is steered to a detector in the form of a detector array having a plurality of detector elements, with the detector arranged in a plane conjugate to a back-side image plane of the objective. Measurement values from the detector elements can each be read and analyzed on an individual basis. A light source can provide an excitation radiation. In an illumination beam path, a beam-shaping optical unit can shape the excitation radiation to form a confocal volume in the sample space and/or, in the detection beam path, a beam-shaping optical unit can shape the detection radiation.