Scanning Microscope Laser Synchronization Feedback Loop
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Solution Overview
Problem
Scanning microscopes using non-synchronizable pulsed lasers suffer from system-related artifacts such as striped patterns and jitter in image brightness due to low-pass behavior in detection circuits and stroboscope-like illumination, leading to reduced image quality.
Innovation Solution
Incorporating an outcoupling element to direct a fraction of the illuminating light beam to a detector, with evaluation electronics to ascertain pulses, and a digital circuit using a comparator and frequency divider to synchronize the pulse frequency of the laser with the scanning device, ensuring the clock frequency is adaptable to the input range of the scanning device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a non-synchronizable pulsed laser is used for illumination, then the laser can operate at high pulse frequencies (80-90 MHz or above), but the scanning device and light source operate independently causing system-related artifacts and image quality degradation
Solution Approach 1:
The patent implements a feedback mechanism where a portion of the laser beam is diverted to a detector that generates synchronization signals. These signals are fed back to control the scanning device, ensuring the scanner is synchronized with the laser pulse frequency. This closes the control loop and eliminates the independence between light source and scanning device operations.
Solution Approach 2:
The patent introduces an intermediary synchronization system that includes a detector receiving laser pulses, evaluation electronics to determine pulse frequency, and a control signal generator. This intermediary system acts as a mediator between the laser source and scanning device, translating laser pulse frequency into appropriate scanning control signals.
2Productivity
If the scanning frequency does not match the laser pulse frequency, then the scanning device can operate at lower frequencies, but striped patterns and jitter appear in the image due to low-pass behavior in detection circuits
Solution Approach 1:
The synchronization system uses feedback from laser pulse detection to dynamically adjust scanning frequency, ensuring it matches the laser pulse frequency. This prevents the mismatch that causes striped patterns and brightness jitter by maintaining precise temporal coordination between illumination and detection.
Solution Approach 2:
The patent dynamically changes the scanning frequency parameter to match the laser pulse frequency. The system evaluates the actual laser pulse frequency and adjusts the scanning frequency accordingly, transforming the scanning parameters in real-time to eliminate artifacts caused by frequency mismatch.
3Productivity
If the laser pulse frequency is above 100 MHz while scanning frequency is much less than 40 MHz, then the system can handle high-speed laser operation, but synchronization becomes difficult and artifacts increase
Solution Approach 1:
The patent introduces an intermediary frequency conversion system that includes a detector, evaluation electronics, and a control signal generator capable of frequency multiplication or division. This intermediary handles the frequency mismatch between high-speed laser (above 100 MHz) and slower scanner (below 40 MHz) by transforming the timing signals appropriately.
Solution Approach 2:
The system dynamically changes the scanning frequency parameter to match the high laser pulse frequency. The evaluation electronics determine the actual laser pulse frequency and the control system adjusts scanning parameters in real-time, enabling synchronization even when the laser operates at frequencies significantly higher than the scanner's natural operating range.
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 solution improves image quality by minimizing system-related artifacts, reducing jitter, and ensuring accurate synchronization between the laser pulse frequency and scanning frequency, resulting in clearer and more stable image acquisition.
Implementation Method 1
an outcoupling element that couples out at least a fraction of the illuminating light beam and directs it to a detector, the pulses of the light source that generates the illuminating light beam being ascertained by evaluation electronics
Implementation Method 2
a laser that delivers light in the form of short pulses
Implementation Method 3
The luminescent or fluorescent light emitted from the sample
Data Source
AI summary
A scanning microscope (1) and a scanning method are disclosed. The scanning microscope (1) has, arranged in the illuminating light beam path (3), an outcoupling element (60) that couples out at least a fraction of the illuminating light beam (3) and directs it to a detector (61) that detects the pulse frequency of the light source that generates the illuminating light beam; and the pulse frequency serves as a basic clock frequency for the scanner.