Insulated Collector Electrode Layout for Low-Noise Ion Detection
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Solution Overview
Problem
Existing analysis methods, such as field asymmetric ion mobility spectrometry (FAIMS), face challenges in accurately detecting trace components at low concentrations due to signal noise interference from applied electric fields, particularly in olfactory and exhalation sensors.
Innovation Solution
A detector device with a collector electrode and detection circuit configuration, including insulation layers and a switching circuit, reduces noise interference by storing charge signals before detection, allowing for improved accuracy in trace component analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an electric field is applied for filtering ionized molecules in FAIMS, then ionized molecules can be separated and filtered by mobility, but the signal from the applied electric field is detected as noise, reducing detection accuracy of trace components
Solution Approach 1:
The patent extracts the harmful electric field signal from the detection path by using a capacitor structure where the collector electrode is electrically insulated from the substrate. The insulation layer physically separates the collection function from the substrate, allowing the electric field filtering signals to be excluded from the detection circuit, thereby eliminating noise interference while preserving trace component detection accuracy
Solution Approach 2:
The insulation layer acts as an intermediary element between the collector electrode and the substrate. This intermediate layer electrically isolates the collector electrode from the substrate, preventing the propagation of electric field signals from the substrate to the detection circuit, thus mediating the separation between the filtering function and the detection function
2Measurement precision
If a simple collector electrode structure is used, then device complexity is reduced, but noise from electric fields cannot be effectively filtered, reducing detection accuracy
Solution Approach 1:
The collector electrode is segmented into multiple functional layers: the collector electrode layer itself, the insulation layer, and the substrate. This segmentation separates the charge collection function from the mechanical support function, allowing the detection circuit to be connected only to the collector electrode layer while electrically isolating it from the substrate, thereby reducing noise without excessive complexity
Solution Approach 2:
The collector electrode structure uses a composite configuration combining conductive material (collector electrode layer) with insulating material (insulation layer). This composite structure enables both charge collection and electrical isolation functions within a single integrated component, improving detection accuracy without significantly increasing device complexity
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
Enhances detection accuracy of trace components by minimizing noise from electric fields, enabling precise measurement of low-concentration substances.
Implementation Method 1
a collector electrode collecting charged particles that pass through a space between the pair of filter electrodes
Implementation Method 2
an insulation layer having an insulation property and disposed between the upper electrode layer and the lower electrode layer
Data Source
AI summary
A detector device includes a pair of filter electrodes, a collector electrode collecting charged particles that pass through a space between the pair of filter electrodes, and a detection circuit connected to the collector electrode and detecting an amount of the charged particles that are collected. The collector electrode includes an upper electrode layer having a collection surface that receives the charged particles, a lower electrode layer that is disposed opposite a surface of the upper electrode layer that is an opposite surface from the collection surface, and an insulation layer having an insulation property and disposed between the upper electrode layer and the lower electrode layer. The detection circuit is configured to be connected to one of the upper electrode layer and the lower electrode layer.