Dual-Loading Charged-Particle Optical System for Cryogenic Specimen Handling
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Solution Overview
Problem
Charged-particle optical systems face challenges in efficiently replacing specimens without disrupting thermal equilibrium, particularly in cryogenic applications, and are limited by the need for specific types of specimen holders that restrict operational flexibility and risk specimen damage during loading.
Innovation Solution
A charged-particle optical system with a loader that allows for in situ specimen holder replacement using a cartridge or removable holder, incorporating a vacuum load lock and gripper for secure attachment and detachment within the system, maintaining operational flexibility across various temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling device is mounted at the specimen holder for cryogenic applications, then the specimen can be maintained at low temperature, but the entire specimen holder must be removed for replacing the specimen
Solution Approach 1:
The specimen holder is divided into two independent parts: a stationary base holder that remains in the chamber and maintains thermal contact with the cooling device, and a removable carrier that holds the specimen. This segmentation allows the specimen carrier to be replaced without removing the entire holder assembly, thus maintaining cryogenic temperature while enabling easy specimen replacement.
Solution Approach 2:
A coupling mechanism acts as an intermediary between the stationary base holder and the removable specimen carrier. This coupling device enables the carrier to be attached and detached from the base holder without requiring removal of the entire assembly, facilitating specimen replacement while preserving the thermal connection at the base holder.
2Adaptability or versatility
If the specimen holder is removed and reinserted after specimen replacement, then the specimen can be changed, but thermal equilibrium is disrupted causing thermal drift
Solution Approach 1:
By segmenting the holder into a stationary base and removable carrier, the base holder with cooling device remains in place during specimen replacement. This eliminates the thermal cycling that occurs when the entire holder is removed and reinserted, preventing thermal drift and maintaining image quality while still allowing specimen changes.
Solution Approach 2:
The stationary base holder continuously maintains thermal contact with the cooling device, automatically preserving thermal equilibrium throughout the specimen replacement process. The system self-regulates temperature without requiring removal and reinsertion of the holder, eliminating thermal drift issues.
3Adaptability or versatility
If a loader with guiding means is introduced for in situ carrier attachment, then operational flexibility is improved, but device complexity increases
Solution Approach 1:
The loading function is extracted as a separate, simple carrier attachment mechanism that operates independently from the main holder structure. The carrier can be attached to the stationary base holder through a straightforward coupling action, providing loading flexibility without adding significant complexity to the overall system.
Solution Approach 2:
The stationary base holder with its coupling mechanism serves multiple functions: it maintains thermal contact with the cooling device, provides a mounting interface for removable carriers, and enables in situ specimen replacement. This multi-functionality reduces the need for additional complex mechanisms while improving operational flexibility.
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 convenient and flexible specimen replacement without interfering with thermal equilibrium, supporting diverse experimental conditions and reducing the risk of specimen damage during loading, while maintaining high image resolution and operational efficiency.
Implementation Method 1
a vacuum load lock (202) configured to maintain a vacuum pressure
Implementation Method 2
a cooling device mounted at the specimen holder and in thermal contact with the specimen
Data Source
AI summary
A charged-particle optical system (100) such as an electron microscope has a vacuum chamber (102) with a space (104) for accommodating a specific one (114) of multiple specimens in operational use. The charged-particle optical system has a loader (106) with a part (108) that is moveable into and out of the space. The part is configured for attaching a specimen carrier (110), brought from outside the system, to a first holder (112) or to detach the carrier from the first holder and to remove the carrier from inside the system. The carrier accommodates a first specimen. The system has an interface (116) in a wall of the chamber for removably accommodating the first holder (112) or a second holder (118) with a second specimen (120) mounted thereon.