Rotary Probe Switching Device for Environment-Controlled AFM
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Solution Overview
Problem
Existing environment-controllable atomic force microscopes (AFMs) can only carry one probe with a single function, leading to contamination and inefficiency when switching between different probes in varying environments, and lack a suitable probe switching device to facilitate in-situ detection at the micro-nano scale.
Innovation Solution
A numerically controlled rotary probe switching device is designed for environment-controllable AFMs, featuring a cavity upper cover with an irregular rectangular boss, a rectangular optical window structure, and a piezoelectric miniature rotation stage for precise and efficient switching of multiple probes with different functions in vacuum, atmospheric, and liquid environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the chamber is opened to replace probes with different functions, then probe switching is achieved, but the original working environment is destroyed and sample surface is contaminated
Solution Approach 1:
The probe switching device divides the probe holder into multiple independent probe positions (at least 4 positions) that can be selectively positioned. Each position can hold a different probe type, allowing switching between probes without opening the chamber. The segmented design includes separate probe holding areas and a positioning mechanism that operates independently within the sealed environment.
Solution Approach 2:
A probe positioning mechanism acts as an intermediary between the sealed chamber and the probe switching operation. This mechanism includes a drive shaft, gears, and positioning plates that enable probe selection and positioning without chamber opening. The intermediary mechanism transfers rotational motion to precisely position the desired probe at the detection location while maintaining environmental isolation.
2Adaptability or versatility
If manual probe replacement is used, then probe switching is achieved, but the operation process is complicated and inefficient
Solution Approach 1:
The manual mechanical probe replacement process is replaced with an automated probe switching system. The system uses a drive shaft connected to a driving mechanism (motor or actuator) that automatically rotates the probe holder to position the desired probe. This mechanical substitution eliminates manual intervention, reduces operational complexity, and significantly improves experimental efficiency through program-controlled automation.
Solution Approach 2:
The probe switching device enables rapid change of operational parameters by allowing quick switching between different probe types. Each probe position can be pre-configured with specific probe characteristics (curvature radius, material, function), and the positioning mechanism can rapidly adjust which probe is active. This parameter change capability allows efficient switching between different measurement modes without manual probe replacement.
3Adaptability or versatility
If the chamber is opened for probe replacement, then different probes can be switched, but oxygen, water vapors and micro-particles are introduced causing pollution
Solution Approach 1:
The probe switching functionality is extracted from the chamber opening operation. Instead of opening the chamber to replace probes, the switching mechanism is integrated within the sealed chamber environment. The probe holder and positioning mechanism are designed to operate entirely within the sealed space, extracting the switching function from any environmental exposure and eliminating the introduction of oxygen, water vapors, and micro-particles.
Solution Approach 2:
The probe switching device operates within the sealed chamber environment, maintaining the inert or controlled atmosphere throughout the switching process. The sealing structure and integrated positioning mechanism ensure that the controlled environment (vacuum, inert gas, or other protected atmosphere) is preserved during probe selection and positioning, preventing contamination from external atmospheric components.
4Device complexity
If one probe with single function is used, then the AFM structure is simple, but various in-situ detection experiments cannot be performed within the same experimental area
Solution Approach 1:
The probe holder is designed with multi-functionality to accommodate at least four different probe types, each capable of performing different detection functions. The universal design allows the same holder structure to support various probe configurations (different curvature radii, materials, and functional characteristics). This enables multiple detection modes (morphology scanning, Raman spectral analysis, friction and wear measurement) to be performed using the same holder assembly, achieving versatility without proportionally increasing structural complexity.
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 device significantly increases internal working space, ensures precise probe switching, and allows for reliable in-situ detection of surface morphology, Raman spectral analysis, and friction measurements within the same experimental area, preventing contamination and improving experimental efficiency.
Implementation Method 1
a probe switching structure provided with at least one probe assembly, wherein the probe switching structure is driven by a piezoelectric miniature rotation stage to switch rotary a probing unit comprising at least four probes with different functions in a vacuum environment or an atmospheric environment or a liquid environment or a varying temperature environment
Data Source
AI summary
A numerically controlled rotary probe switching device based on an environment-controllable atomic force microscope (AFM) includes a cavity upper cover and a probe switching structure. The cavity upper cover is provided with an irregular rectangular boss, an inner groove, a rectangular optical window structure and a sealing flange structure. The irregular rectangular boss is provided with the rectangular optical window structure; a front end of the boss is provided with the sealing flange structure; and a lower portion of the boss is provided with an inner groove for accommodating the probe switching structure and a transition groove for matching with a linear movement of a sample carrier and a rotary switching of probes. The probe switching structure is configured inside the inner groove, and the probe switching structure is provided with at least one probe assembly.