Switchable Confocal Diaphragm for Multispot Microscopy
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Solution Overview
Problem
Light scanning microscopes with spectral detection face challenges in adapting to varying sample examination parameters, particularly in minimizing phototoxicity through optimal spectral sensitivity and image capture rates while balancing high spatial resolution and faster imaging needs.
Innovation Solution
A light scanning microscope design featuring a switchable illumination module with m and n spots, a deflecting unit, and a detector module with a confocal diaphragm unit and splitting unit, allowing for confocal and spectrally resolved detection by switching between different aperture configurations and beam paths to accommodate various operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the microscope uses a fixed single-spot illumination configuration, then the spectral detection precision is high, but the imaging speed is slow
Solution Approach 1:
The illumination system is segmented into multiple independent laser spots (m spots and n spots) that can be selectively activated. The detector module is correspondingly segmented with switchable confocal diaphragms that can be configured to match the number of active illumination spots, enabling parallel detection channels that increase imaging speed while maintaining spectral precision for each spot
Solution Approach 2:
The system dynamically switches between different operational configurations: single-spot mode (m=1) for high spectral precision applications, and multi-spot mode (n>1) for faster imaging applications. The confocal diaphragm unit dynamically reconfigures its aperture configuration to match the active illumination pattern, optimizing performance for the current imaging mode
2Measurement precision
If the microscope is designed for high spectral resolution, then the spectral sensitivity is high, but the phototoxicity to biological samples increases
Solution Approach 1:
The excitation power is dynamically adjusted based on the imaging mode: single-spot illumination uses lower power for extended spectral measurements, while multi-spot illumination distributes power across multiple locations, reducing peak intensity and phototoxicity. The system adapts the total excitation energy to match the detection requirements
Solution Approach 2:
The multi-spot configuration enables continuous imaging across multiple regions simultaneously, reducing the total measurement time and cumulative phototoxic exposure. By parallelizing the detection process across n spots, the system achieves high spectral sensitivity without requiring prolonged exposure of any single location
3Productivity
If the confocal diaphragm unit is configured for multi-spot detection, then the imaging speed increases, but the device complexity increases
Solution Approach 1:
The confocal diaphragm unit is designed as a universal component that can be configured for any number of spots (from 1 to n) through a single switching mechanism. Rather than requiring separate diaphragm assemblies for each spot configuration, the system uses one multi-functional diaphragm unit with switchable aperture patterns, reducing overall device complexity
Solution Approach 2:
The system uses dynamic switching mechanisms (such as MEMS mirrors or electro-optic switches) to reconfigure the confocal diaphragm apertures in real-time. This dynamic reconfiguration allows the same physical hardware to serve multiple detection modes without requiring redundant components for each mode, managing complexity through intelligent control rather than physical multiplication of parts
4Adaptability or versatility
If the microscope switches between different illumination modes, then the adaptability to various sample examination parameters improves, but the ease of operation decreases
Solution Approach 1:
The system incorporates automated feedback control that monitors the sample characteristics and imaging requirements, then automatically selects and configures the appropriate illumination and detection mode. The control system provides feedback between the illumination module and confocal diaphragm unit to ensure they are properly synchronized, reducing the manual coordination burden on the operator
Solution Approach 2:
The microscope system performs self-configuration when switching between modes: the control unit automatically adjusts both the illumination spot pattern and the confocal diaphragm aperture configuration in a coordinated manner. This self-service capability eliminates the need for manual intervention to reconfigure multiple components, maintaining ease of operation despite increased versatility
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
Enables optimal confocal and spectrally resolved detection for both single and multispot illuminations, providing flexible operating modes that enhance imaging capabilities and reduce phototoxicity by adjusting aperture configurations and beam paths.
Implementation Method 1
a splitting unit for spectral spreading of the sample radiation into partial beams
Implementation Method 2
a detector module for confocal and spectrally resolved detection of the sample radiation
Data Source
AI summary
A light scanning microscope with an illumination module switchable between an illumination with m number of spots and an illumination with n number of spots, a deflecting unit which moves the m or n spots in a predetermined sample region, and a detector module for confocal and spectrally resolved detection of the sample radiation. The detector module has a confocal diaphragm unit, a splitting unit which is arranged downstream of the confocal diaphragm unit, a detector, and an imaging unit which images the partial beams on the detector in a spatially separated manner. The confocal diaphragm unit is switchable between a confocal diaphragm with exactly m apertures for m-spot illumination and a confocal diaphragm with n apertures for n-spot illumination. The splitting unit has a first beam path for m-spot illumination and a second beam path for n-spot illumination. The splitting unit is switchable between the two beam paths.