Composite Waveguide Plug for Radar Level Gauge Clogging
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Solution Overview
Problem
High-frequency non-contacting radar level gauge systems face challenges with clogging and increased production and maintenance costs due to narrow ceramic waveguides used in high-pressure and high-temperature applications, which are sensitive to handling and require stringent sealing.
Innovation Solution
A radar level gauge system featuring a waveguide with a composite plug comprising a non-conductive sleeve member and a metallic plug member, where the non-conductive sleeve member is sealingly joined to both the hollow conductor and the metallic plug member, allowing for a larger cross-sectional area and reducing clogging risks while maintaining sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a narrow ceramic waveguide is used for high-frequency radar level gauge systems, then the beam angle is narrowed and measuring range is extended, but the risk of material clogging increases and handling sensitivity deteriorates
Solution Approach 1:
The waveguide is constructed as a composite structure combining a ceramic core (for electromagnetic signal guidance) with a metallic outer layer (for mechanical strength and larger diameter). This composite design allows the waveguide to maintain the narrow beam angle and extended measuring range of ceramic waveguides while avoiding clogging and handling sensitivity issues through the larger overall diameter provided by the metallic envelope.
2Shape
If a narrow ceramic waveguide is used for high-frequency radar level gauge systems, then the beam angle is narrowed, but the waveguide becomes sensitive to handling and production costs increase
Solution Approach 1:
The metallic envelope surrounding the ceramic core provides mechanical protection and robustness, making the waveguide less sensitive to handling while maintaining the narrow beam angle characteristic. The composite structure combines the electromagnetic properties of ceramic with the mechanical strength of metal.
3Reliability
If a narrow ceramic waveguide is used for high-pressure and high-temperature applications, then sealing requirements are stringent, but production and maintenance costs increase
Solution Approach 1:
The composite waveguide structure with metallic outer layer facilitates more economical manufacturing and assembly compared to pure ceramic waveguides. The metallic component allows for standard joining techniques and reduces production complexity while maintaining sealing integrity under high-pressure and high-temperature conditions.
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 solution enhances the reliability and ease of operation by reducing clogging and production costs, while ensuring the system can withstand high-pressure and high-temperature conditions without compromising sealing or sensitivity.
Implementation Method 1
a waveguide arranged between the transceiver and the antenna to receive the transmit signal from the transceiver and guide the transmit signal towards the antenna
Implementation Method 2
the non-conductive sleeve member being sealingly joined to a portion of the hollow conductor and to the metallic plug member
Implementation Method 3
Based on a relation between the transmit signal and the reflection signal, the distance to the surface of the product can be determined
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A radar level gauge system, comprising a transceiver; an antenna for radiating an electromagnetic transmit signal from the transceiver towards a surface of the product and for returning an electromagnetic reflection signal back towards the transceiver; a feed-through connecting the transceiver and the antenna; and processing circuitry coupled to the transceiver for determining the filling level based on a relation between the transmit signal and the reflection signal, wherein the feed-through comprises a waveguide arranged between the transceiver and the antenna to receive the transmit signal from the transceiver and guide the transmit signal towards the antenna in a guiding direction, the waveguide comprising an elongated plug arranged in a hollow conductor extending in the guiding direction, wherein the plug comprises a non-conductive sleeve member and a metallic plug member, the non-conductive sleeve member being sealingly joined to a portion of the hollow conductor and to the metallic plug member.