Transparent Resistive Layer for Vacuum Particle Detection
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Solution Overview
Problem
Existing particle detection apparatuses require complex and costly procedures to switch between different detection modes, often necessitating the breaking of vacuum conditions and mechanical adaptations, limiting their operational flexibility and accuracy.
Innovation Solution
A detection device featuring an interposition element made of electrically insulating and transparent material, with a luminescent layer and a resistive layer of specific ohmic resistance, allowing for both optical and electronic acquisitions without disrupting the vacuum, enabling seamless switching between detection modes without altering the vacuum conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multi-channel detection mode with anodes is used, then particle position and arrival time can be detected, but the number of connectors is limited to a couple of dozens and the resolution depends on anode sizes
Solution Approach 1:
A transparent resistive layer is introduced as an intermediary between the vacuum chamber and the detection electronics. This layer allows electrical signals to be transmitted through it to external readout electronics while maintaining vacuum seal, eliminating the need for numerous vacuum feedthroughs. The resistive layer acts as a mediator that enables both optical transparency for imaging and electrical conductivity for signal readout.
Solution Approach 2:
The transparent resistive layer serves multiple functions simultaneously: it maintains the vacuum seal, transmits optical signals for imaging detection, and conducts electrical signals from particle impacts to external readout electronics. This multi-functionality eliminates the need for separate components for each detection mode.
2Measurement precision
If an optical detection mode with phosphorus layer and CCD camera is used, then two-dimensional acquisition with position and quantity information is achieved, but the phosphorus layer spreads charge causing blurring effect
Solution Approach 1:
The transparent resistive layer is positioned between the phosphorus layer and the vacuum chamber, acting as an intermediary that collects charge before it can spread extensively through the phosphor. This allows the resistive layer to capture the charge signal while maintaining vacuum integrity, and the optical signal can still pass through to the CCD camera with reduced blurring.
Solution Approach 2:
The resistive layer has locally optimized properties: it is transparent to optical signals while having specific electrical resistance characteristics that allow charge collection. This local differentiation of properties enables simultaneous optimization of both optical imaging and electrical signal detection.
3Measurement precision
If cross delay anodes are used for centroid finding, then precise temporal and spatial information is obtained, but the system requires complex delay lines and feedthroughs
Solution Approach 1:
The transparent resistive layer serves as a mediator that replaces the need for complex internal delay line structures. By positioning the resistive layer at the vacuum interface, charge signals from particle impacts can be read out externally without requiring multiple vacuum feedthroughs or complex internal wiring, simplifying the overall system architecture.
4Reliability
If detection devices are associated with chamber walls using flanges, then the chamber can be sealed, but it generates an interface between inside and outside that complicates vacuum maintenance
Solution Approach 1:
The transparent resistive layer is integrated directly into the chamber wall structure, merging the detection element with the vacuum barrier. This eliminates the need for separate flange interfaces and associated feedthroughs, as the resistive layer itself becomes part of the vacuum seal while providing signal transmission capability.
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 flexible and precise detection of particles using various methods without interrupting the vacuum, simplifying operations and maintaining high accuracy across different detection modes.
Implementation Method 1
a luminescent layer (20), configured to illuminate when in contact with a particle
Implementation Method 2
a resistive layer (21) with an ohmic resistance comprised between 1kΩ/sq and 50MΩ/sq
Implementation Method 3
an interposition element (16) made of an electrically insulating material and transparent to visible light
Data Source
Figure 1~3
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Figure 6~7
AI summary
Device to detect particles comprising a support body (14) attachable in correspondence to an aperture (15) provided in a wall (12) of an analysis chamber (13) for a detection apparatus (1 1), such as an electronic electrostatic deflection analyzer or a time-of- flight analyzer. The support body (14) is configured to support at least an interposition element (16) configured to close the analysis chamber (13). The interposition element (16) is made of an electrically insulating material, transparent to visible light, and on the interposition element (16), on the side that during use faces inside the analysis chamber (13), a luminescent layer (20) and a resistive layer (21) with an ohmic resistance comprised between 1kΩ/sq and 50MΩ/sq. are disposed.