Ion Mobility Filter Isolation Channel for Debris Contamination
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Solution Overview
Problem
Existing methods for manufacturing MEMS gas sensors, such as ion filters, face contamination issues during the cutting process due to debris generation, which affects the integrity and performance of the ion channels.
Innovation Solution
The method involves forming an electrode layer with an ion channel and an isolation channel surrounding it, along with a support layer that includes an aperture aligned with the ion channel, to reduce contamination during separation and enhance filter resolution by managing electric fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode layer is cut or diced using a thin saw to separate individual ion filters, then the individual ion filters can be separated from the wafer, but debris is generated that contaminates the ion channels
Solution Approach 1:
The electrode layer is divided into multiple ion filters arranged in a grid pattern, allowing individual filters to be separated. The isolation channels create natural segmentation boundaries that facilitate clean separation while protecting the ion channels from debris during the cutting process.
Solution Approach 2:
The isolation channel acts as an intermediary barrier between the ion channel and the cutting debris. By positioning the ion channel within the isolation channel, the patent creates a protective buffer zone that prevents direct contact between debris generated during sawing and the sensitive ion channel, thus reducing contamination.
2Object-affected harmful factors
If an isolation channel surrounds the ion channel, then contamination risk is reduced, but the ion filter is divided into at least two pieces requiring a support layer
Solution Approach 1:
The electrode layer is segmented into multiple functional regions by the isolation channel, which divides the structure into distinct zones. This segmentation protects the ion channel while maintaining the overall filter structure through the grid arrangement of multiple filters on the wafer.
Solution Approach 2:
The isolation channel serves multiple functions: it acts as a protective barrier against contamination, provides structural support to maintain electrode integrity, and facilitates the separation of individual ion filters. This multi-functionality reduces the need for additional support structures.
3Productivity
If multiple ion filters are formed on a single silicon wafer to increase productivity, then manufacturing efficiency is improved, but the separation process generates more debris that can contaminate ion channels
Solution Approach 1:
The wafer is divided into a grid of multiple ion filters with isolation channels between them. This segmentation creates natural barriers that contain debris within specific regions during the cutting process, preventing cross-contamination between adjacent filters while maintaining high production efficiency.
Solution Approach 2:
The isolation channel serves as a protective intermediary that shields the ion channels from debris generated during the mass separation process. By surrounding each ion channel with an isolation channel, the patent ensures that even when multiple filters are processed simultaneously, debris from cutting one filter cannot contaminate neighboring ion channels.
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
This approach minimizes contamination and improves filter resolution by allowing ions to flow through the ion channel while preventing debris from entering, enabling more accurate chemical detection and separation in gas samples.
Implementation Method 1
The flow of ions from a sample through the ion channel is controlled by the application of a compensation field and a dispersion field
Data Source
AI summary
A method of manufacture for a ion mobility filter is disclosed. The method of manufacturing an ion filter for a spectrometry system includes providing a sheet of conductive material and defining a plurality of ion filters on the sheet. The definition of the plurality of ion filters is achieved by forming an electrode layer for each ion filter on the sheet, where each electrode layer comprises at least one ion channel and an isolation channel surrounding the at least one ion channel. A support layer on each electrode layer is also formed. Each support layer comprises an aperture at least partially aligned with the at least one ion channel. The ion filter is then separated. The risk of contaminants entering the at least one ion channel when separating the ion filters is reduced by surrounding the at least one ion channel with the isolation channel.