Detector With High Sheet Resistance Fourth Electrode
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Solution Overview
Problem
Existing detectors face challenges in simplifying the circuit for applying potentials and improving resolution, particularly due to complex voltage applications and continuous changes in correction voltages.
Innovation Solution
The detector design includes a first electrode, second electrodes forming a flow path, third electrodes for collecting charged particles, and a fourth electrode with a higher sheet resistance than the second electrodes, which extends along a direction intersecting the flow path. This configuration allows for the application of different potentials to the second electrodes and simplifies the potential supply circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different compensation bias voltages are applied to multiple electrode pairs to detect different ion species, then detection capability is improved, but circuit complexity increases
Solution Approach 1:
The second electrode is divided into multiple electrode portions (first electrode portion, second electrode portion, third electrode portion) with different conductivities arranged side by side. Each portion can be independently controlled to apply different compensation bias voltages, enabling detection of multiple ion species while maintaining a simplified single-electrode structure
Solution Approach 2:
Different portions of the second electrode are assigned different conductivities (first conductivity, second conductivity, third conductivity) to create localized electrical properties. This allows each region to respond differently to applied voltages, enabling species-specific detection without requiring completely separate electrode pairs
2Adaptability or versatility
If correction voltage is applied to the third electrode portion with low conductivity, then ion detection is enabled, but resolution decreases due to continuous voltage changes
Solution Approach 1:
The patent applies a dynamic voltage control strategy where the voltage applied to the third electrode portion is changed in discrete steps rather than continuously. The voltage is adjusted based on the position of ions in the drift region, allowing the correction voltage to adapt to different ion types while maintaining constant potential across the electrode portion to preserve resolution
Solution Approach 2:
The conductivity of the third electrode portion is specifically designed to be lower than the first and second electrode portions, creating a distinct electrical parameter that enables selective ion detection. Combined with step-wise voltage adjustment, this parameter change allows the system to detect different ion species while maintaining measurement precision
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 proposed design simplifies the circuit for supplying potentials and enhances the resolution of detection results by maintaining constant potentials across the filter electrodes, reducing the complexity of voltage applications.
Implementation Method 1
a fourth electrode connected to the second electrodes and having a sheet resistance higher than sheet resistances of the second electrodes
Implementation Method 2
the fourth electrode includes one end portion having a first potential in the third direction and another end portion having a second potential lower than the first potential in the third direction
Implementation Method 3
a detector for separating and detecting ions based on ion mobility
Implementation Method 4
the first electrode, second electrodes facing the first electrode with a space and forming a flow path for charged particles
Data Source
AI summary
A detector includes a first electrode, second electrodes forming a flow path for charged particles between the first electrode and the second electrodes, third electrodes configured to collect the charged particles, and a fourth electrode having a sheet resistance higher than sheet resistances of the second electrodes. The fourth electrode has one end portion having a first potential in a third direction and another end portion having a second potential lower than the first potential in the third direction, the fifth electrode included in the second electrodes is connected to the fourth electrode, the sixth electrode included in the second electrodes is connected to the fourth electrode, a seventh electrode included in the third electrodes is arranged side by side with the fifth electrode along a first direction, and an eighth electrode included in the third electrodes is arranged side by side with the sixth electrode along the first direction.