Automatic Laser Reflection Path Adjustment for Atomic Force Microscopes
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Solution Overview
Problem
The existing manual adjustment methods for laser reflection paths in Atomic Force Microscopes (AFMs) are cumbersome, prone to operator fatigue, and require frequent re-adjustments when replacing probes, posing risks to the operator's eyesight.
Innovation Solution
An automatic adjustment system for laser reflection paths, comprising a central processing device, driving device, four-quadrant photodetector, driving arm, micro cantilever, sample placing table, light reflector, laser, CCD-equipped optical microscope, vibration sensor, signal processing circuit, display device, storage device, and control device, which automatically positions the micro cantilever at the center of the laser spot by processing image information from the CCD and monitoring vibration signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustment method is used, then the adjustment process can be completed, but the operability is weak and the process is complicated
Solution Approach 1:
The patent replaces the manual mechanical adjustment system with an automatic optical-electrical control system. The CCD camera captures images of the laser spot position, the central processing device analyzes the image data to determine the spot's location, and the driving device automatically adjusts the mirror or cantilever position based on the calculated offset. This substitution eliminates the need for manual observation and mechanical manipulation, significantly improving ease of operation while reducing process complexity through automation.
Solution Approach 2:
The system enables self-service adjustment by allowing the AFM instrument to automatically correct its own laser alignment. The feedback loop continuously monitors the laser spot position via the CCD camera and autonomously adjusts the optical path components without external intervention. This self-aligning capability eliminates the need for operator involvement in the adjustment process, improving operability and reducing the complexity of manual procedures.
2Adaptability or versatility
If manual adjustment is performed frequently, then the laser path can be readjusted when probe is replaced, but operator fatigue occurs and eye damage risk increases
Solution Approach 1:
The patent replaces manual visual inspection and mechanical adjustment with an automated optical detection and motorized adjustment system. The CCD camera detects the laser spot position automatically, the central processing device calculates the required adjustment, and the driving device executes the correction. This eliminates the need for operators to repeatedly expose their eyes to the laser beam during adjustment, removing the harmful effect while preserving the adaptability to re-adjust the laser path whenever needed.
Solution Approach 2:
The patent introduces the CCD camera as an intermediary between the laser beam and the operator. Instead of the operator directly observing and adjusting the laser spot position, the camera captures the spot position and transmits this information to the central processing device. This intermediary eliminates the operator's direct exposure to the laser beam, removing the eye damage risk while maintaining the system's ability to adapt and re-adjust the laser path as needed.
3Measurement precision
If automatic adjustment system is implemented, then the positioning accuracy is improved, but the system complexity increases
Solution Approach 1:
The patent replaces manual positioning with an automated system that uses optical detection (CCD camera) and motorized adjustment (driving device). The CCD camera provides precise digital measurement of the laser spot position, the central processing device performs accurate calculations to determine the optimal adjustment, and the driving device executes precise mechanical movements. This automated approach achieves high positioning accuracy while managing system complexity through the integration of standard components and automated control algorithms.
Solution Approach 2:
The patent implements a closed-loop feedback system where the CCD camera continuously monitors the laser spot position, the central processing device analyzes the position data and determines the deviation from the target position, and the driving device makes corrective adjustments based on this feedback. This feedback mechanism ensures high positioning accuracy by continuously correcting any deviations, while the automated nature of the feedback loop manages system complexity through algorithmic control rather than complex mechanical linkages.
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 significantly improves the operability and accuracy of laser reflection path adjustments, reducing operator fatigue and the risk of eye damage, while ensuring precise positioning of the micro cantilever, enhancing the overall efficiency and reliability of AFM operations.
Implementation Method 1
a laser beam is emitted by the laser, an image collected by the CCD equipped with the optical microscope is processed by the central processing device to identify the micro cantilever
Implementation Method 2
a four-quadrant photodetector, a laser and a piezoelectric ceramic scanner
Implementation Method 3
an image collected by the CCD equipped with the optical microscope is processed by the central processing device to identify the micro cantilever
Implementation Method 4
a four-quadrant photodetector, a laser and a piezoelectric ceramic scanner
Data Source
AI summary
A system of automatic adjustment of a laser reflection path, comprising a central processing device, a driving device, a four-quadrant photodetector, a driving arm, a micro cantilever, a sample, a sample placing table, a light reflector, a laser, a CCD equipped with an optical microscope, a vibration sensor, a signal processing circuit, a display device, a storage device, and a control device; a system of automatic adjustment of the laser reflection path is controlled by the control device, wherein a laser beam is emitted by the laser, an image collected by the CCD equipped with the optical microscope is processed by the central processing device to identify the micro cantilever, and then a driving arm is driven by a driving device to drive the micro cantilever to move to the center of a laser spot, during which vibration signals of the driving arm are also under monitoring.