Particle Beam Barrier Positioning for Collision-Safe Microscopy
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Solution Overview
Problem
Existing methods for positioning objects in a particle beam microscope, such as scanning electron microscopes, often require image recording, which can damage samples and are prone to collisions due to lack of reliable non-contact monitoring.
Innovation Solution
A method using a particle beam barrier that detects signal changes from a defined barrier region scanned by a charged particle beam, allowing precise positioning without contact, using existing detectors to monitor object entry and exit from the region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image recording methods are used to control bringing-closer procedures, then visual monitoring is achieved, but sample damage occurs due to irradiation and time is consumed
Solution Approach 1:
A light barrier system is introduced as an intermediary monitoring mechanism that does not require irradiating the sample. The light barrier detects the position of the micromanipulator and sample holder through optical detection, allowing visual monitoring of the bringing-closer procedure without using the particle beam that would otherwise damage the sample.
Solution Approach 2:
The patent replaces the particle beam-based image recording method with a light-based detection system. Instead of using charged particles to create images that monitor the positioning, a separate optical detection system is employed that mechanically detects positions without causing sample damage.
2Adaptability or versatility
If sample stage structures are moved to allow examination, then sample positioning flexibility is improved, but collision risk with objective lens increases
Solution Approach 1:
The light barrier system provides continuous feedback on the position of the sample stage and sample holder during movement. This feedback mechanism allows the system to detect when structures are approaching the objective lens and adjust or stop movement to prevent collisions, enabling safe flexible positioning.
Solution Approach 2:
The light barrier is positioned to detect objects before they reach critical zones near the objective lens. By detecting positions in advance, the system can take preliminary action to prevent collisions before they occur, allowing greater movement freedom while maintaining safety.
3Measurement precision
If laser apparatus is used for positioning, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The light barrier system serves multiple functions: it monitors the position of the micromanipulator, tracks the sample holder location, and provides collision avoidance feedback. By making this single detection system multi-functional, the patent achieves precise positioning without requiring separate laser apparatus for each function.
Solution Approach 2:
The patent combines the monitoring and positioning functions into a single light barrier system that works together with the existing particle beam microscope components. Rather than adding separate laser positioning apparatus, the light barrier is integrated with the microscope's detection capabilities to provide unified positioning control.
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 precise, non-contact monitoring and positioning of objects in a particle beam microscope, reducing sample damage and collision risks while utilizing existing equipment.
Implementation Method 1
A method using a particle beam barrier that detects signal changes from a defined barrier region scanned by a charged particle beam
Data Source
AI summary
A method for positioning a movable object in a sample chamber of a particle beam microscope is carried out with the aid of a flexible particle beam barrier. The particle beam microscope comprises at least one particle beam column for producing a beam of charged particles, and a sample chamber, a detector for detecting interaction signals and a control and evaluation unit. In the method, initially an object is provided in the sample chamber. Next, a barrier region is defined, which is subsequently scanned with the beam of charged particles. The interaction signals produced during the scan are detected. The object is moved towards the barrier region, wherein the detected interaction signals are monitored and signal changes are registered, with the result that it is possible to detect when the object moves into the barrier region or leaves the barrier region.