Monolithic Ceramic IMS Drift Tube for Miniature Sensors
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Solution Overview
Problem
Existing techniques for producing IMS drift tubes are limited by high production costs and complexity, which hinder the development of high-performance, miniature sensors on a large scale, and often rely on materials that lead to thermal conductivity issues and extended downtime.
Innovation Solution
The method involves forming sensor structures using high-temperature, non-electrically-conductive ceramic materials like aluminum nitride or alumina, where discrete sheets are layered and via holes are created to connect the interior and exterior, with circuitry features formed using ink deposition, enabling efficient and scalable production of IMS drift tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional IMS drift tubes are produced using metallic and insulator rings or ceramic rolling processes, then the structural integrity and electrical isolation are maintained, but the production costs increase and manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functions into a single monolithic ceramic component. The drift tube structure integrates the drift region, electrode supports, and sealing features into one piece formed from a single blank of ceramic material, eliminating the need for separate metallic rings, insulator components, and multiple assembly steps while maintaining electrical isolation and structural integrity
Solution Approach 2:
The monolithic ceramic drift tube serves multiple functions simultaneously: it provides the drift region enclosure, supports electrodes, provides electrical isolation, enables sealing, and facilitates heating. This multi-functional design replaces several separate components with a single universal structure that performs all necessary functions
2Reliability
If conventional IMS drift tubes are produced using metallic and insulator rings or ceramic rolling processes, then the structural integrity is maintained, but the production costs increase
Solution Approach 1:
The invention segments the manufacturing process into two phases: forming the monolithic ceramic structure from a blank in one step, then adding electrode features and sealing elements in subsequent steps. This segmentation allows the complex monolithic structure to be produced efficiently using standard ceramic forming techniques followed by simpler post-processing operations
Solution Approach 2:
The patent changes the material parameter from composite (metallic rings + insulators) to monolithic ceramic, which fundamentally alters the manufacturing approach. The monolithic ceramic can be formed in a single pressing or sintering operation, eliminating the need for precision machining, assembly, and sealing operations required for composite structures, thereby reducing production costs
3Manufacturing precision
If drift tubes are heated for thermal processing, then the ceramic material is sintered or fired, but the heating time increases downtime
Solution Approach 1:
The patent performs preliminary forming of the ceramic green body before sintering, allowing the structure to be shaped while the material is still pliable. This preliminary action enables complex geometries to be created without requiring extensive post-sintering machining or processing, thereby reducing the overall manufacturing time and downtime
Data Source
AI summary
For ion mobility spectrometry applications, a desired shape of a sensor structure may be created by forming a desired shape from a ceramic material, such as aluminum nitride. In various embodiments, the sensor structure may be formed using discrete individual ceramic sheets and/or from a preformed ceramic tube. Via holes are formed into the sensor structure to provide for efficient circuitry configurations of the IMS drift tube and/or providing electrical connections between the interior and exterior of the drift tube.