Fluorescence Microscopy Time-Gated Light Suppression
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Solution Overview
Problem
Wide-field fluorescence microscopes face challenges in suppressing scattered/reflected light, limiting spectral flexibility and sensitivity due to invariable filter characteristics and the unsuitability of acousto-optical devices, which restricts their ability to acquire high-quality images.
Innovation Solution
The use of pulsed light sources synchronized with gatable imaging detectors, such as APD arrays or gatable cameras, to selectively reject scattered/reflected light components, allowing only suitable fluorescence components for evaluation and eliminating the need for traditional filter cubes, enabling greater spectral freedom and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional filter cubes are used for spectral filtering, then scattered/reflected light is suppressed, but spectral flexibility is lost and detection sensitivity is reduced
Solution Approach 1:
The invention changes the temporal parameter of light detection by using time-gated detection synchronized with pulsed excitation. This allows spectral flexibility to be improved because no physical filters are needed - the system can detect any wavelength by simply adjusting the detection timing window, while still suppressing scattered light through temporal gating.
Solution Approach 2:
The invention uses periodic pulsed excitation combined with periodic time-gated detection. The detector is activated only during specific time windows following each excitation pulse, creating a periodic detection rhythm that rejects continuous scattered light while capturing transient fluorescence signals across the full spectrum.
2Object-affected harmful factors
If barrier filters are used to suppress scattered light, then image quality is maintained, but the detection region must be spectrally distant from excitation wavelength
Solution Approach 1:
The invention replaces the mechanical/optical filter system with an electronic temporal gating system. Instead of using physical barrier filters that block certain wavelengths, the system uses electronic timing windows to reject scattered light based on its temporal characteristics, allowing detection sensitivity to be improved by detecting signals at any wavelength without spectral distance constraints.
3Object-affected harmful factors
If acousto-optical devices are used for light gating, then scattered light suppression is achieved, but device complexity and cost increase enormously
Solution Approach 1:
The invention extracts the gating function from complex optical components and implements it electronically at the detector level. By removing the need for acousto-optical modulators or other complex optical gating devices, the system achieves scattered light suppression while dramatically reducing device complexity and cost.
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 effectively suppresses scattered/reflected light, enhancing image quality and spectral flexibility, allowing for tunable excitation and detection wavelengths, and improving sensitivity in wide-field fluorescence microscopy.
Implementation Method 1
a pulsed light source (1)
Implementation Method 2
an imaging detector (2) arranged to be triggered by the light source (1) such that the imaging detector (2) is active only during a predetermined time period following the emission of a light pulse
Data Source
AI summary
A microscope for fluorescence imaging microscopy, in particular for wide-field fluorescence microscopy, including a pulsed light source (1) and an imaging detector (11), is characterized in that means for gating are provided, and in that the gating causes the light source (1) and the detector (11) to be synchronized in order to suppress reflected/scattered light such that suitable fluorescence components are used for evaluation and unsuitable components are rejected. Furthermore, a method is used to perform fluorescence imaging microscopy using the microscope according to the present invention.