Miniature Vacuum Shutter Using Magnetic Actuation
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Solution Overview
Problem
Existing mechanical shutters for ultra-high vacuum scientific experiments are large, bulky, slow, or costly, and lack compatibility with vacuum environments, making them unsuitable for fast and precise control of atomic or optical beams.
Innovation Solution
A miniature mechanical shutter assembly using a stainless steel tube with neodymium magnets and a solenoid-controlled mechanism, housed in vacuum-compatible components, allowing for rapid and reliable operation within a compact space, with adjustable parameters for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional mechanical shutters are used, then beam blocking function is achieved, but the shutter becomes large and bulky
Solution Approach 1:
The shutter is segmented into a stationary housing and a movable shutter assembly that can be independently positioned. The shutter assembly includes a rod with a flat section and aperture that moves separately from the housing, allowing compact integration while maintaining vacuum compatibility through proper sealing interfaces.
Solution Approach 2:
The shutter assembly is nested within the vacuum chamber housing, with the movable rod containing the aperture nested within the housing structure. The Teflon-coated rod nests within the vacuum chamber, and the glass tubing track is integrated within the housing, creating a compact nested arrangement that reduces overall volume while maintaining functionality.
2Speed
If conventional mechanical shutters are used, then beam blocking function is achieved, but the shutter operation becomes slow
Solution Approach 1:
The conventional mechanical actuation system is replaced with a magnetic field-based actuation system. A magnet mounted on the shutter rod interacts with an external magnet or electromagnetic coil to provide contactless actuation, eliminating mechanical friction and inertia limitations. This allows the lightweight shutter assembly to achieve rapid acceleration and deceleration with travel times of a few milliseconds.
Solution Approach 2:
The shutter design changes the mass parameter by using a lightweight rod structure with minimal material, and changes the actuation parameter by using magnetic fields instead of mechanical motors. These parameter changes enable faster response times while maintaining sufficient blocking capability.
3Volume of moving object
If compact shutter design is implemented, then space efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The shutter rod is coated with Teflon (polytetrafluoroethylene), a flexible non-stick coating that prevents adhesion and friction. This thin film coating simplifies the manufacturing of the compact shutter by using standard coating techniques while enabling reliable operation in the compact configuration without complex anti-friction mechanisms.
Solution Approach 2:
The shutter assembly uses composite materials including a metal rod coated with Teflon, glass tubing for the track, and magnetic materials. These composite material choices allow compact design while maintaining ease of manufacture through standard material processing techniques for each component type.
4Speed
If fast shutter operation is achieved, then beam control precision is improved, but energy consumption increases
Solution Approach 1:
The solenoid actuation uses periodic pulsed current rather than continuous power. The solenoid is energized only during the brief periods when shutter actuation is needed (a few milliseconds), and remains de-energized during the majority of the time when the shutter is stationary. This periodic action achieves fast response when needed while minimizing overall energy consumption.
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 shutter achieves fast operation (2 milliseconds travel time) with negligible heating and high reliability, maintaining functionality in vacuum conditions and offering customizable solutions for various applications without the need for frequent maintenance.
Implementation Method 1
A pulse of current through a solenoid (a coil of wire) creates a magnetic field that displaces one of the magnets, causing the shutter to open or close
Implementation Method 2
Three neodymium magnets (one in each end of the steel tube, and one external to the housing) control the rotational and axial motion of the shutter
Data Source
AI summary
A miniature mechanical shutter having a chamber, a shutter member having an aperture formed therethrough that is mounted to the chamber to allow translation and rotation about an axis. A pair of cap members are disposed on opposing ends of the shutter member to support the shutter member during the translation and rotation. The shutter further comprising a plurality of magnet members, such that a first of the plurality of magnet members is disposed in a first end of the shutter member, a second of the plurality of magnet members is disposed in a second end of the shutter member opposite the first end, and a third of the plurality of magnets members is disposed external to the chamber. At least one of the plurality of magnet members is responsive to an electrical impulse to translate and/or rotate the shutter member between an opened position and a closed position.