Radar Fill-Level Sensor Circuit Board Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fill-level measuring devices using the travel time principle face accuracy degradation due to potential destructive interference caused by shifts in the circuit board's separation from the rear wall, leading to reduced microwave intensity.
Innovation Solution
A radar fill-level measuring device with a circuit board featuring at least two openings and a hollow conductor with lateral edge projections that extend beyond the board, secured by a lid, ensuring the circuit board's immobility and optimal separation for maximum microwave intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the circuit board is allowed to shift or the sending/receiving element changes its separation from the rear wall, then the assembly is simpler to manufacture, but the measurement precision degrades due to destructive interference and reduced microwave intensity
Solution Approach 1:
The hollow conductor is pre-formed with lateral edge projections that extend through the circuit board before assembly. This preliminary preparation ensures that when the lid is secured, the circuit board is automatically positioned at the correct separation distance from the rear wall, preventing shifts and maintaining optimal microwave intensity for accurate measurements.
Solution Approach 2:
The lid acts as an intermediary component that secures the circuit board to the hollow conductor. By fastening the lid to the hollow conductor and engaging with the protruding projections, it maintains the circuit board at a fixed separation distance, preventing shifts that would cause destructive interference while allowing for straightforward assembly.
2Productivity
If the separation between the coupling element and the rear wall is not precisely controlled, then the assembly process is faster, but the intensity of radiated microwaves is reduced due to destructive interference
Solution Approach 1:
The hollow conductor is pre-formed with lateral edge projections that extend through the circuit board before assembly. This preliminary preparation ensures that when the lid is secured, the circuit board is automatically positioned at the correct separation distance from the rear wall, preventing shifts and maintaining optimal microwave intensity for accurate measurements.
Solution Approach 2:
The assembly is divided into separate components (hollow conductor with projections, circuit board, and lid) that can be manufactured and prepared independently. The projections extend through the board in advance, allowing the lid to be secured without complex alignment procedures, thus maintaining productivity while ensuring proper separation for maximum microwave intensity.
3Ease of manufacture
If the circuit board position is not fixed relative to the hollow conductor, then the assembly is easier to manufacture, but the separation changes over time leading to measurement errors
Solution Approach 1:
The lid acts as an intermediary component that secures the circuit board to the hollow conductor. By fastening the lid to the hollow conductor and engaging with the protruding projections, it maintains the circuit board at a fixed separation distance, preventing shifts that would cause destructive interference while allowing for straightforward assembly.
Solution Approach 2:
The hollow conductor is pre-formed with lateral edge projections that extend through the circuit board before assembly. This preliminary preparation ensures that when the lid is secured, the circuit board is automatically positioned at the correct separation distance from the rear wall, preventing shifts and maintaining optimal microwave intensity for accurate measurements.
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 assembly simplicity and maintains accurate fill-level measurements by ensuring the circuit board's stable position relative to the hollow conductor, resulting in maximum radar wave intensity and improved measurement accuracy.
Implementation Method 1
radar fill-level measuring device for measuring a fill level of a fill substance in a container using the travel time principle
Implementation Method 2
microwaves are sent by means of an antenna toward the surface of a fill substance and the echo waves reflected on the surface received
Implementation Method 3
the separation between the sending/receiving element and the rear wall must lie in a certain value range... This can lead to destructive interference and, thus, to low intensity, radiated microwaves
Data Source
AI summary
A radar fill-level measuring device for measuring a fill level of a fill substance in a container using the travel time principle, comprising a circuit board with a sending/receiving system for sending and receiving high-frequency radar waves, wherein the circuit board has at least two openings, a hollow conductor having at least two lateral edge projections, wherein lengths of the at least two projections are greater than the thickness of the circuit board, wherein the at least two projections are led through the at least two openings, so that the at least two projections extend partially out from a second side of the circuit board, a lid, which is secured to parts of the at least two projections, which extend out from the second side of the circuit board, such that the hollow conductor is secured to the circuit board by means of the lid.