Integrated Dual-Probe Atomic Force Microscope for Rapid In-Situ Switching
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Solution Overview
Problem
Current dual-probe switching methods in atomic force microscopes are hindered by long probe replacement times, poor positioning accuracy, and limited compatibility with liquid and biological samples, as well as complex manufacturing and integration with commercial systems.
Innovation Solution
An integrated dual-probe system with a hinge structure and piezoelectric ceramic-driven cantilever beams allows for rapid in-situ switching and independent motion control, enabling simultaneous imaging and measurement in various environments without the need for complex probe replacement, using a single motion control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional manual or automatic probe replacement is used, then probe switching can be achieved, but the replacement time is long (ten minutes to ten seconds) and positioning accuracy is poor
Solution Approach 1:
The patent combines multiple probes (coarse probe and fine probe) into a single integrated probe assembly with a shared clamp structure. This merging eliminates the need for separate replacement operations, enabling rapid switching between probes while maintaining precise positioning through the unified motion control system of the atomic force microscope.
Solution Approach 2:
The patent implements dynamic probe switching capability where the coarse and fine probes can be rapidly exchanged during the imaging process. The integrated design allows the system to switch between probes based on real-time imaging needs, reducing the time loss associated with traditional replacement methods while maintaining positioning accuracy through coordinated motion control.
2Measurement precision
If a fine tip is used for high-resolution imaging, then imaging quality is improved, but the fine tip is easy to be worn and polluted and cannot meet requirements after large-range imaging
Solution Approach 1:
The patent implements dynamic probe selection where the system can switch between a coarse probe for large-range scanning and a fine probe for high-resolution imaging. This dynamic approach allows the fine probe to be protected from wear during coarse scanning operations, maintaining its durability and imaging capability throughout the measurement process.
Solution Approach 2:
The patent segments the imaging task into two parts: large-range coarse scanning performed by a robust coarse probe, and high-resolution detailed imaging performed by a delicate fine probe. This segmentation protects the fine probe from damage during extensive scanning while still enabling high-resolution imaging when needed.
3Adaptability or versatility
If dual probes with different spring constants are used for samples with different mechanical properties, then measurement adaptability is improved, but the system complexity increases
Solution Approach 1:
The patent combines multiple probes with different spring constants into a single integrated assembly that shares a common clamp and motion control system. This merging approach enables the system to adapt to different sample mechanical properties by selecting the appropriate probe, while avoiding the complexity of multiple independent probe systems through unified control architecture.
4Measurement precision
If chemically modified probe is used for measuring specific molecular binding force, then measurement specificity is improved, but the modified probe is easy to be polluted and destructed
Solution Approach 1:
The patent implements dynamic probe switching that allows the system to use a chemically modified probe for specific molecular binding force measurements when needed, while switching to an unmodified probe for routine scanning operations. This dynamic approach protects the chemically modified probe from pollution and destruction by limiting its use to specific measurement tasks.
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 enables rapid switching within 10 seconds and precise positioning to within 1 micron, supporting advanced imaging modes like contact and peak force tapping, while being compatible with commercial systems and suitable for diverse sample types, including those in liquid environments.
Implementation Method 1
piezoelectric ceramic-driven cantilever beams allows for rapid in-situ switching and independent motion control
Implementation Method 2
the laser is irradiated to the flexible cantilever beam through an emitter, the back of the cantilever beam can reflect the laser well, and the reflected laser is irradiated on a photoelectric position sensitive detector
Data Source
AI summary
An atomic force microscope has dual probes composed of a hinge structure, two cantilever beams and needle tips arranged on free ends of the cantilever beams. The hinge structure is a U-shaped body having two ends respectively extended with a first cantilever beam and a second cantilever beam. The free end of the first cantilever beam and the free end of the second cantilever beam are respectively provided with a first needle tip and a second needle tip. The integrated dual probes is operated by the driving function of the probe clamp. Therefore, only a set of motion control and measurement system of the atomic force microscope is required to realize the rapid in-situ switching function of the dual probes.