Modular Focal Plane Detector for Parallel Mass Spectrum Capture
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Solution Overview
Problem
Current SIMS instruments are limited by the number of detectors that can be installed, preventing the acquisition of a full parallel mass spectrum snapshot without multiple analyses, and suffer from destructive analysis nature leading to varying spectral data at different sample depths.
Innovation Solution
A detection device comprising multiple microchannel plate assemblies arranged side-by-side with a gap of at most 1 mm, each with a dedicated read-out anode, allowing for a full-length focal plane detector that can collect all ion masses in parallel along a focal plane, enabling 100% duty cycle and high spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple detectors are installed on the focal plane, then the ability to acquire full parallel mass spectrum snapshot is improved, but the device complexity and space requirements increase
Solution Approach 1:
The detection device is divided into multiple independent detector modules, each equipped with its own read-out anode. These modular detectors can be independently manufactured, tested, and assembled along the focal plane, reducing the overall system complexity while enabling parallel mass spectrum acquisition.
Solution Approach 2:
The patent transitions from a single linear focal plane to a two-dimensional array of detectors distributed across the focal plane. This spatial arrangement allows multiple mass spectra to be acquired simultaneously at different positions, dramatically improving productivity without proportionally increasing complexity.
2Length of stationary object
If a single long MCP assembly is used, then continuous focal plane coverage is improved, but manufacturing and alignment precision requirements increase
Solution Approach 1:
Instead of manufacturing one extremely long MCP assembly, the system uses multiple shorter MCP assemblies arranged side-by-side. Each assembly can be manufactured with standard precision tolerances, and the modular design simplifies alignment and replacement procedures compared to a single monolithic assembly.
Solution Approach 2:
Each MCP assembly is optimized for its specific local region of the focal plane, with dimensions and characteristics tailored to the local detection requirements. This localized optimization allows each component to be manufactured with achievable precision while collectively covering the entire focal plane.
3Area of stationary object
If detectors are placed close together to maximize focal plane coverage, then the area utilization is improved, but the difficulty of maintaining uniform electric field increases
Solution Approach 1:
Adjacent MCP assemblies are biased at the same electric potential, creating equipotential regions that simplify the electric field configuration. This approach maintains field uniformity across detector boundaries without requiring complex field-shaping structures, enabling tight packing while preserving detection performance.
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 the collection of complete chemical information with high sensitivity and dynamic range, achieving high spatial resolution and full mass spectral data in a short acquisition time, overcoming the limitations of existing SIMS instruments.
Implementation Method 1
each MCP assembly is configured for receiving charged particles, neutral particles or radiation that impinge on its entry face and for generating a corresponding amplified detection signal on its opposite exit face
Implementation Method 2
at least one read-out anode for collecting said amplified detection signals, the anode being arranged at a distance to, and in parallel with the respective exit faces of said MCP assemblies
Data Source
AI summary
A detection device for detecting charges particles. The active area of the detector extends along a principal direction over several centimeters and up to 1 meter or more. This allows for its use as a focal plane detector for a mass spectrometer device, allowing to record all mass-to-charge ratios provided by the spectrometer in parallel and within a reduced acquisition time.