Dynamic Illumination System for TIRF and FRAP Microscopy
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Solution Overview
Problem
Fluorescence microscopy requires specific illumination conditions for TIRF and FRAP experiments, where existing systems struggle to seamlessly switch between collimated and convergent light beams, leading to suboptimal results due to interference fringes, non-uniformity, and limited control over illumination angles.
Innovation Solution
An illumination system that selectively projects collimated or convergent light beams by controlling light paths and using galvanometer scanning mirrors or acousto-optical deflectors to steer beams at designated angles, allowing for precise incidence and focal positioning, enabling both TIRF and FRAP microscopy with improved uniformity and rapid angle variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a stationary beam system is used for illumination, then the system structure is simple, but the illumination uniformity is poor and artifacts appear
Solution Approach 1:
The patent employs dynamic beam scanning using galvanometer mirrors or acousto-optical deflectors to replace stationary illumination. The beam is rapidly scanned across multiple angles and positions, creating a dynamic illumination pattern that achieves uniformity without requiring complex mechanical illumination systems. This dynamic approach resolves the contradiction by maintaining simple system structure while achieving high illumination uniformity through temporal averaging of multiple beam positions.
2Ease of operation
If the illumination angle is fixed, then the system is easy to operate, but the adaptability for different microscopy techniques is limited
Solution Approach 1:
The patent implements rapid variation of illumination parameters (angle, position, duration) through electronic control of scanning mirrors and acousto-optical deflectors. This allows the system to adapt to different microscopy techniques (TIRF, FRAP, photoactivation) by changing operational parameters rather than physical configuration, maintaining ease of operation while achieving high versatility. The ability to programmatically adjust parameters enables seamless switching between different experimental modes.
3Measurement precision
If a collimated beam is used for TIRF microscopy, then the incidence angle control is precise, but the system cannot provide convergent beams for FRAP experiments
Solution Approach 1:
The patent designs a universal illumination system that can provide both collimated beams for TIRF microscopy and convergent beams for FRAP experiments using the same optical path. By incorporating programmable beam scanning and dynamic focusing capabilities, the system achieves multi-functionality without requiring separate dedicated systems for different microscopy techniques, thereby resolving the contradiction between precise angle control and beam type flexibility.
4Device complexity
If the beam position is fixed, then the system structure is simple, but the productivity for scanning large fields is limited
Solution Approach 1:
The patent replaces mechanical beam positioning systems with electronic control of galvanometer mirrors and acousto-optical deflectors. This substitution enables rapid beam scanning across large fields without the mechanical inertia and complexity of traditional positioning mechanisms. The electronic control system achieves high scanning speeds and productivity while maintaining relatively simple system structure, resolving the contradiction between mechanical simplicity and scanning productivity.
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 provides superior TIRF illumination with reduced artifacts, rapid multi-angle microscopy, and efficient FRAP/photoactivation experiments by ensuring optimal beam control and uniformity across large fields, outperforming traditional stationary beam systems.
Implementation Method 1
using galvanometer scanning mirrors or acousto-optical deflectors to steer beams at designated angles
Implementation Method 2
using galvanometer scanning mirrors or acousto-optical deflectors to steer beams at designated angles
Data Source
AI summary
There is provided a method that includes projecting a collimated light beam from an optical system to a plane during a first mode of operation of the optical system, and projecting a convergent light beam from the optical system to the plane during a second mode of operation of the optical system. The method further includes, (a) during the first mode of operation, controlling a trajectory of a first light bundle in a first light path in the optical system, to steer the collimated light beam through the plane at a designated incidence angle, and (b) during the second mode of operation, controlling a trajectory of a second light bundle in a second light path of the optical system, to steer the convergent light beam to a target position in the plane. There is also provided an apparatus and a system that employs the method.