Segmented Metallic Coating for Differential Pressure Sensor
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Solution Overview
Problem
The construction of existing differential pressure sensors is complex, which complicates their design and functionality.
Innovation Solution
A differential pressure sensor design featuring a measuring membrane supported by concave counter-bodies with a metallic coating that includes an inner and outer area separated by an insulation area, where the outer area is electrically conductively connected to the measuring membrane, and a capacitive transducer with a metallic coating on the surface facing the membrane, simplifying the mechanical and electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the counterbodies have a planar surface with concave diaphragm beds and concentric electrodes, then the capacitive transducer can be formed, but the construction becomes very complex
Solution Approach 1:
The metallic coating on the counterbody is segmented into functionally distinct inner and outer regions separated by an insulating region. The inner region forms the capacitive transducer electrode, while the outer region provides electrical connection to the measuring diaphragm, dividing the coating into independent functional zones that simplify the overall construction
Solution Approach 2:
The electrical connection function is extracted from the capacitive transducer electrode by providing a separate outer metallic region that is electrically isolated from the inner electrode region. This allows the electrode to maintain its sensing function while the outer region handles the connection function, reducing construction complexity
2Manufacturing precision
If the measuring diaphragm is connected to counterbodies via spacers, then defined mechanical conditions are achieved, but the construction complexity increases
Solution Approach 1:
The mechanical connection and electrical connection functions are merged into a single integrated structure where the outer region of the metallic coating serves both to electrically connect the measuring diaphragm to the counterbody and to provide the necessary mechanical support, eliminating the need for separate spacer components
Solution Approach 2:
The outer metallic region is designed to perform multiple functions simultaneously: it provides electrical connection to the measuring diaphragm, establishes defined mechanical boundary conditions for the diaphragm, and serves as part of the overall structural assembly, reducing the total number of components needed
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 design simplifies the construction and functionality of differential pressure sensors by providing reliable electrical contacting and defined mechanical conditions, enhancing the sensor's ability to detect pressure differences effectively.
Implementation Method 1
a capacitive transducer for converting a pressure-dependent deflection of the measuring diaphragm into at least one electrical signal
Implementation Method 2
The capacitive transducer comprises at least one counterbody electrode which is formed by a metallic coating on the surface of the counterbody facing the measuring membrane
Implementation Method 3
the deflection of the measuring diaphragm depends on the difference between the first pressure and the second pressure
Data Source
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AI summary
A differential pressure sensor comprises a measuring diaphragm made of an electrically conductive material, two electrically insulating mating bodies, and at least one capacitive transducer. The measuring diaphragm is connected to the mating bodies in a pressure-tight manner with the formation of a measuring chamber in each case along a circumferential edge. The mating bodies each have a diaphragm bed which is concave in the center, wherein the mating bodies each have a pressure channel which extends through the mating body into the measuring chamber. The capacitive transducer has at least one mating body electrode which is formed by a metallic coating of the surface of the mating body in the region of the diaphragm bed and with which contact can be made by a metallic coating of the wall of the pressure channel. The mating body electrode is formed by an inner region of the metallic coating, which inner region is annularly enclosed by an outer region of the coating and is separated from the latter by an annular insulation region.